Eurotherm 2704 User Manual
  1. Manuals
  2. Brands
  3. Eurotherm Manuals
  4. Controller
  5. 2704
  6. User manual

Eurotherm 2704 User Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
2700
User
Manual
2704 Process Controller
HA026933/7
Nov 2012

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 2704 and is the answer not in the manual?

Questions and answers

Related Manuals for Eurotherm 2704

Summary of Contents for Eurotherm 2704

  • Page 1 2700 User Manual 2704 Process Controller HA026933/7 Nov 2012...
  • Page 2 The information in this document is given in good faith, but is intended for guidance only. Eurotherm Limited will accept no responsibility for any losses arising from errors in this document.

  • Page 3: Table Of Contents

    CHAPTER 18 ANALOGUE AND MULTIPLE OPERATORS ..........247 CHAPTER 19 LOGIC OPERATORS..................253 CHAPTER 20 DIGITAL COMMUNICATIONS ............... 256 CHAPTER 21 2704 MASTER COMMUNICATIONS ............. 263 CHAPTER 22 STANDARD IO ....................273 CHAPTER 23 MODULE IO ..................... 284 CHAPTER 24 TRANSDUCER SCALING................. 316 CHAPTER 25 IO EXPANDER....................
  • Page 4 WHAT IS 2704 ............................... 13 CHAPTER 2 INSTALLATION ..................... 14 MECHANICAL INSTALLATION ........................14 2.1.1 Positioning ....................................14 2.1.2 Outline dimensions Model 2704 ............................. 14 2.1.3 Mounting the Controller ................................15 2.1.4 Unplugging and Plugging in the Controller ......................... 15 I/O MODULES ............................... 16 2.2.1...
  • Page 5 2704 Controller Engineering Handbook CHAPTER 7 INSTRUMENT CONFIGURATION ............... 58 WHAT IS INSTRUMENT CONFIGURATION? ..................... 58 7.1.1 To Select the Instrument Configuration Pages ........................58 TO CONFIGURE CONTROLLER OPTIONS ....................59 7.2.1 INSTRUMENT Options Page ..............................59 7.2.2 INSTRUMENT Info Page ................................60 7.2.3...
  • Page 6 CHAPTER 10 ALARM OPERATION ..................119 10.1 DEFINITION OF ALARMS AND EVENTS ....................119 10.1.1 Customisable Parameter Names ............................ 119 10.2 TYPES OF ALARM USED IN 2704 CONTROLLER ..................120 10.2.1 Full Scale High ................................... 120 10.2.2 Full Scale Low ..................................120 10.2.3 Deviation High Alarm ...............................
  • Page 7 2704 Controller Engineering Handbook 11.4.7 Analogue Value ..................................143 11.5 GAIN SCHEDULING ........................... 144 11.5.1 To Configure Gain Scheduling:- ............................145 11.5.2 PID Parameters ...................................145 11.5.3 PID (Aux) Parameters .................................147 11.6 OUTPUT PARAMETERS ..........................148 11.6.1 Table of Output Parameters .............................148 11.7 MOTORISED VALVE CONTROL .......................
  • Page 8 Engineering Handbook 2704 Controller 13.3.3 Probe Impedance ................................186 13.4 HUMIDITY CONTROL..........................187 13.4.1 Overview ..................................... 187 13.4.2 Example Of Humidity Controller Connections ......................187 13.4.3 Temperature Control Of An Environmental Chamber ....................188 13.4.4 Humidity Control Of An Environmental Chamber ....................... 188 13.5...
  • Page 9 2704 Controller Engineering Handbook 15.6 TOTALISERS ............................... 223 15.6.1 Totaliser Parameters ................................223 15.7 APPLICATION EXAMPLE ........................... 224 15.7.1 Compressor Timer ................................224 CHAPTER 16 ADVANCED FUNCTIONS ................225 16.1 PATTERN GENERATOR ..........................225 16.1.1 Example: Programmer Event Outputs ...........................225 16.2 ANALOGUE SWITCHES..........................227 16.2.1...
  • Page 10 Engineering Handbook 2704 Controller 20.4.8 iTools Setup ..................................261 20.5 Addendum:- 2704 Controller Specials number EU0678 ............... 262 CHAPTER 21 2704 MASTER COMMUNICATIONS .............. 263 21.1 INTRODUCTION ............................263 21.1.1 Broadcast Communications............................. 263 21.1.2 Direct read/write................................263 21.2 WIRING CONNECTIONS ........................... 264 21.2.1...
  • Page 11 2704 Controller Engineering Handbook CHAPTER 24 TRANSDUCER SCALING................. 316 24.1 WHAT IS TRANSDUCER SCALING?......................316 24.2 SHUNT CALIBRATION ..........................316 24.2.1 To Calibrate a Strain Gauge Bridge Transducer ......................317 24.3 LOAD CELL CALIBRATION ........................319 24.3.1 To Calibrate a Load Cell ..............................319 24.4...
  • Page 12 Engineering Handbook 2704 Controller APPENDIX B SAFETY AND EMC INFORMATION ............... 362 30.1 Safety ................................362 30.1.1 Electromagnetic compatibility ............................362 30.2 GENERAL ..............................362 30.3 Service and repair ............................362 30.3.1 Electrostatic discharge precautions ..........................362 30.3.2 Cleaning ....................................362 30.4...
  • Page 13 2704 Controller Engineering Handbook Related Handbooks The following related handbooks may be downloaded from the Eurotherm web site www.eurotherm.co.uk/ 2704 User Guide (shipped with the controller) Part Describes Installation and general operation No. HA029465. Series 2000 Communication Handbook Part No.

  • Page 14: Chapter 1 Introduction

    2704 Controller CHAPTER 1 INTRODUCTION Thank you for selecting the 2704 High Performance Programmer/Controller. This chapter provides a general overview of your controller to help you to become more familiar with its use, and to ensure that it is the correct type for your process.

  • Page 15: What Is 2704

    2704 Controller Engineering Handbook WHAT IS 2704 The 2704 is a modular, fully configurable, high accuracy, high stability temperature and process controller which is available in a single, dual or three loop format. It is supplied in accordance with an ordering code which can be found printed on a label on the side of the instrument case.

  • Page 16: Chapter 2 Installation

    2704 Controller CHAPTER 2 INSTALLATION The 2704 controller must be mounted and wired in accordance with the instructions given in this chapter and in the Installation sheet, Part No. HA029465 which is supplied with the controller. The controller is intended to be mounted through a cut out in the front panel of an electrical control cabinet.

  • Page 17: Mounting The Controller

    2704 Controller Engineering Handbook 2.1.3 Mounting the Controller 1. Prepare the panel cut-out to the size shown in Figure 2-2. Ensure that there is sufficient spacing between instruments as shown by the minimum dimensions given in Figure 2-2. Ensure also that the controller is not mounted close to any device which is likely to produce a significant amount of heat which may affect the performance of the controller.

  • Page 18: I/O Modules

    Engineering Handbook 2704 Controller I/O MODULES The 2704 controller has the facility to fit optional plug in modules. The connections for these modules are made to the inner three connector blocks as shown below. The modules are: • Communications modules.

  • Page 19: Wiring

    2704 Controller Engineering Handbook WIRING WARNING You must ensure that the controller is correctly configured for your application. Incorrect configuration could result in damage to the process being controlled, and/or personal injury. It is your responsibility, as the installer, to ensure that the configuration is correct. The controller may either have been configured when ordered, or may need configuring now.

  • Page 20: Rear Terminals

    Engineering Handbook 2704 Controller REAR TERMINALS Power Supply Digital Input Digital I/O I/O Expander or Digital input Relay Analogue input PV input 0-10V Analogue input screen The functionality of the two outer rows of terminals is common to all instrument variants, as follows:-...

  • Page 21: Standard Connections

    2704 Controller Engineering Handbook STANDARD CONNECTIONS 2.5.1 Power Supply Wiring Controllers supplied with the VH Supply Voltage option are suitable for connection to a power supply of between 100 and 240Vac, -15%, +10%, 48 to 62 Hz. Controllers supplied with the VL Supply Voltage option are suitable for connection to a power supply of between 24Vac/dc , -15%, +10%, 48 to 62Hz or 20 to 29Vdc.

  • Page 22: Sensor Input Connections

    Engineering Handbook 2704 Controller 2.5.3 Sensor Input Connections The fixed PV input can accept a range of sensors including Thermocouple, RTD (Pt100), Pyrometer, Voltage (e.g. 0-10Vdc) or Milliamp (e.g. 4-20mA) signals. These sensors are used to provide inputs to Control Loop 1.

  • Page 23: Analogue Input Connections

    2704 Controller Engineering Handbook 2.5.4 Analogue Input Connections The analogue input is supplied as standard and is intended to accept 0 to 10 Vdc from a voltage source. A milli- amp current source can be used by connecting a 100Ω resistor across terminals BA and BB. This input can be used as a remote setpoint input, remote setpoint trim or as a high level PV input to a control loop.

  • Page 24: I/O Expander (Or Additional Digital Input)

    I/O Expander (or Additional Digital Input) An I/O expander (Model No 2000IO) can be used with the 2704 to allow the number of I/O points to be increased by a further 20 digital inputs and 20 digital outputs. Data transfer is performed serially via a two wire interface from instrument to expander.

  • Page 25: Digital I/O

    2704 Controller Engineering Handbook 2.5.6 Digital I/O Eight digital I/O connections are provided as standard. They can be individually configured as: 1. Inputs Run, Hold, Reset, Auto/Manual, etc, - logic or contact closure. 2. Outputs Configurable as Control outputs, Programmer Events, Alarms, etc.

  • Page 26: Optional Plug In Module Connections

    Digital Communications Connections Digital Communications modules can be fitted in two positions in the 2704 controller. The connections being available on HA to HF and JA to JF depending on the position in which the module is fitted. The two positions could be used, for example, to communicate with a configuration package, such as ‘iTools’, on one position and...
  • Page 27 2704 Controller Engineering Handbook EIA485 4-wire (or EIA422) Connections ‘daisy chained’ to other instruments A’ (Rx+) B’ (Rx-) KD485 EIA232 to Common EIA422/ EIA 485 A(Tx+) 4-wire converter B (Tx-) Figure 2-14: RS485 4-Wire Communications Connections Profibus Connections ‘daisy chained’ to other...

  • Page 28: Devicenet ® Wiring

    Engineering Handbook 2704 Controller 2.6.2 DeviceNet Wiring ® This section covers the DeviceNet digital communications option. To configure DeviceNet communications refer to the DeviceNet Handbook Part No HA027506. 2.6.2.1 DeviceNet Terminal Functions Terminal Color Description Reference Label Chip DeviceNet network power positive terminal. Connect the red wire of the DeviceNet cable here.
  • Page 29 2704 Controller Engineering Handbook 2.6.2.2 Wiring Interconnections for DeviceNet Communications 121 terminating resistor 5-Position required fitted if not COMBICOM internally 2704 Controller V+ 5 CAN-H 4 CAN-H Drain 3 Drain CAN-L 2 CAN-L Card (SLAVE) Address 11 2704 Controller Diag...

  • Page 30: Ethernet Connections

    Engineering Handbook 2704 Controller 2.6.3 Ethernet Connections When the controller is supplied with the Ethernet communications option a special cable assembly is also supplied. This cable must be used since the magnetic coupling is contained within the RJ45 connector. It consists of an RJ45 connector (socket) and a termination assembly which must be connected to terminals HA to Use standard CAT5 cable to connect to the Ethernet 10BaseT switch or hub.

  • Page 31: I/O Modules

    2.6.4 I/O Modules The 2704 controller contains five positions in which 4-terminal I/O modules can be fitted. These positions are marked Module 1, Module 3, Module 4, Module 5, Module 6, in Figure 2-4. Module 2 is reserved for the Memory Module which can only be fitted in this position.
  • Page 32 Engineering Handbook 2704 Controller I/O Module Typical usage Connections and examples of use Code Triac Heating, cooling, valve First triac and TT and Dual Raise raise, valve Triac lower (0.7A, 30 to Voltage Motorised supply 264Vac valve combined rating) Lower Second triac Note: Dual relay modules may be used in place of dual triac.
  • Page 33 2704 Controller Engineering Handbook I/O Module Typical usage Connections and examples of use Code TDS Module TDS Control in boilers 2 Electrode TDS Probe Probe tip Probe Earth The diagrams show general wiring connections. Boiler Earth Connection terminals vary from supplier to supplier.
  • Page 34 Engineering Handbook 2704 Controller I/O Module Typical usage Connections and examples of use Code 4-Wire PRT Two special versions of the Input 4-wire RTD (Modules 3 & PV Input 6 only) module provide high PRT 100Ω accuracy, high stability temperature PRT25.5Ω...
  • Page 35 2704 Controller Engineering Handbook I/O Module Typical usage Connections and examples of use Code Motorised Potentio- +0.5v meter Input valve position feedback (100Ω to Wiper Remote SP 15KΩ) Dual PV Input To accept two Current 0-2V inputs from a (Modules 3 &...

  • Page 36: To Connect Zirconia (Dual Signal) Probe

    Engineering Handbook 2704 Controller TO CONNECT ZIRCONIA (DUAL SIGNAL) PROBE A dual signal probe, such as a Zirconia probe, will normally be connected to a Dual PV Input module (Code DP). The module presents two channels, A and C, where A is the voltage input and C is the mV, thermocouple, RTD or mA input.

  • Page 37: Zirconia Probe Screening

    2704 Controller Engineering Handbook 2.7.1 Zirconia Probe Screening 2.7.1.1 Zirconia Carbon Probe Construction Screen Outer Electrode Ceramic Insulator Zirc. mV Hot End Inner Electrode Thermocouple Zirconia Sensor Outer metallic shell of the probe Figure 2-20: Zirconia probe construction 2.7.1.2 Screening connections when two modules are used The zirconia sensor wires should be screened and connected to the outer shell of the probe if it is situated in an area of high interference.

  • Page 38: Chapter 3 Operation

    This chapter describes day to day operation of the controller. OPERATOR INTERFACE - OVERVIEW The front panel of the 2704 consists of a 120 x 160 pixel electroluminscent display, and seven operator push- buttons. Figure 3-1 shows an example of a single loop display.

  • Page 39: The Operator Buttons

    2704 Controller Engineering Handbook 3.1.1 The Operator Buttons LOOP PROG When pressed, this toggles between automatic and manual mode: Auto/Manual • If the controller is in automatic mode ‘AUT’ is displayed button • If the controller is in manual mode, ‘MAN’ is displayed...

  • Page 40: Status Messages

    Engineering Handbook 2704 Controller 3.1.2 Status Messages Messages appear on the display to show the current status of the controller. Table 3-1 below describes these messages:- LP1, LP2, LP3 LP1, LP2, LP3 Indicates which loop is being viewed. may be user defined names. All user defined...

  • Page 41: Parameters And How To Access Them

    2704 Controller Engineering Handbook PARAMETERS AND HOW TO ACCESS THEM Parameters are settings, within the controller, which determine how the controller will operate. They are accessed, using the buttons, and can be changed, to suit the process, using the buttons.

  • Page 42: Navigation Overview

    Engineering Handbook 2704 Controller NAVIGATION OVERVIEW 3.3.1 To Select a Page Header Do This This Is The Display You Should See Additional Notes 1. From any display press The vertical bar on the right of the display as many times as indicates the position of the page header.

  • Page 43: To Navigate To A Parameter From A

    2704 Controller Engineering Handbook 3.3.2 To Navigate to a Parameter from a Page Header. Do This This Is The Display You Should See Additional Notes 1. From any page press as many times as necessary to symbol indicates that the page select the list of Page Headers header is followed by a list of sub-headers.

  • Page 44: To Change Next Parameter In The List

    Engineering Handbook 2704 Controller 3.3.3 To Change Next Parameter in the List This section describes how to select further parameters in the list which you may wish to alter or to view. Do This This Is The Display You Should See Additional Notes 1.

  • Page 45: Parameter Values

    2704 Controller Engineering Handbook PARAMETER VALUES Parameter values can be displayed in different ways depending upon the parameter type. The different types of parameter, and how their values are changed, are shown below. 1. Numerical Values (eg Full Scale High Alarm Setpoint)

  • Page 46: Confirmation Mechanism

    Engineering Handbook 2704 Controller 3.5.1 Confirmation Mechanism Having changed a value, when the key is released, the display will blink after a period of 1.5 seconds, indicating that the new parameter value has been accepted. If any other key is pressed during the 1.5 second period the parameter value is accepted immediately.

  • Page 47: Parameter Tables

    2704 Controller Engineering Handbook PARAMETER TABLES Subsequent chapters in this manual refer to parameter tables. These tables provide the full list of parameters available in ‘Config’ level in a particular page. The table below is an example. Column 1 gives the name of the parameter as it appears on the display.

  • Page 48: Navigation Diagram

    Engineering Handbook 2704 Controller NAVIGATION DIAGRAM SUMMARY INSTRUMENT OEM SECURITY Options Parameters for Customised Select OEM SECURITY summary Info using See Supplement See Chapter 7 Units Display Page Prom OEM SECURITY SUMMARY Page User Text only appears if only appears if...
  • Page 49 2704 Controller Engineering Handbook From LP3 SETUP Previous page BOILER ZIRCONIA PROBE HUMIDITY INPUT OPERS Blowdown Options Options Cust Lin 1 Select using Wiring Wiring Cust Lin 2 Cust Lin 3 Switch 1 Monitor 1 BCD Input Parameters for Parameters for...
  • Page 50 Engineering Handbook 2704 Controller From USER PAGE X Previous page ANALOGUE OPERS PATCH WIRING MULTI OPERS LOGIC OPERS Select Select Select Select using using using An. 1 using MultiOp1 Logic 1 Wire 1 An. 24 MultiOp3 Logic 32 Wire 32...

  • Page 51: Chapter 4 Function Blocks

    (as ‘Inputs’), manipulates the data internally (using parameter ‘Settings’) and ‘outputs’ data at the other side to interface with analogue or digital IO and other function blocks. Figure 4-1 shows a representation of a PID function block as used in the 2704 controller. Loop...

  • Page 52: Chapter 5 Soft Wiring

    Engineering Handbook 2704 Controller CHAPTER 5 SOFT WIRING WHAT IS SOFT WIRING? Soft Wiring (sometimes known as User Wiring) refers to the connections which are made in software between function blocks. This chapter describes the principles of soft wiring through the operator interface of the instrument.

  • Page 53: An Example Of Soft Wiring

    2704 Controller Engineering Handbook 5.1.1 An Example of Soft Wiring To make this connection see section 5.1.2.1. STANDARD To make this connection Loop 1 see section 5.1.2.2 PV Src PV Input CH1 OP Ctrl Hold Src PVIn.Val Integr Hld Src...

  • Page 54: Configuration Of The Simple Pid Loop

    Engineering Handbook 2704 Controller 5.1.2 Configuration of the Simple PID Loop The following description explains how the wiring connections are made to produce the simple PID controller shown in Figure 5-1. 5.1.2.1 To connect the PV input to the Loop The example is to connect the output from the ‘PV Input’...
  • Page 55 2704 Controller Engineering Handbook Do This This Is The Display You Should See Additional Notes Select the wire source PV Src of LP1.is the parameter to 12. Press to display the be wired to. parameter list 13. Press to select ‘PV Src’...
  • Page 56 Engineering Handbook 2704 Controller 5.1.2.2 To connect the Loop to the Output Module The example is Loop 1 Channel 1 output to Module 1A input. Do This This Is The Display You Should See Additional Notes Select the wire source 1.
  • Page 57 2704 Controller Engineering Handbook Do This This Is The Display You Should See Additional Notes Paste the wire 14. Press the Loop Select button, The Loop Select button becomes a ‘paste’ button in this mode , to paste the copied parameter ie 00013 to the Wire Src of Module 1A.

  • Page 58: Chapter 6 Access Levels

    Level 2 Passcode ‘2’ Level 3 Passcode ‘3’ View Config Passcode ‘2704’ Config Passcode ‘4’ These passcodes, with the exception of View Config, can be changed in configuration level. If a passcode of ‘None’ has been entered for any level (apart from View Config which is fixed) it will not be necessary to enter a passcode to enter that level.

  • Page 59: To Enter Configuration Level

    2704 Controller Engineering Handbook TO ENTER CONFIGURATION LEVEL Do This This Is The Display You Should See Additional Notes This is the page header which 1. From any display press contains the access levels return to the page header menu.

  • Page 60: Chapter 7 Instrument Configuration

    Engineering Handbook 2704 Controller CHAPTER 7 INSTRUMENT CONFIGURATION WHAT IS INSTRUMENT CONFIGURATION? Instrument configuration allows you to enable and set up features within the instrument such as:- The number of loops Control application - PID, Programmer, Zirconia, Humidity, Input Operators, Timer Blocks, Analogue and...

  • Page 61: To Configure Controller Options

    2704 Controller Engineering Handbook TO CONFIGURE CONTROLLER OPTIONS Do This This Is The Display You Should See Additional Notes Select INSTRUMENT (Options Page) as in section 5.1.1. Press to display the list of parameters 1, 2 or 3 loops can be...

  • Page 62: Instrument Info Page

    Engineering Handbook 2704 Controller Table Number: These parameters allow you to enable or disable instrument INSTRUMENT options. This table is only available in Configuration Level 7.2.1. (Options Page) Parameter Name Parameter Description Further Info Value Timer Blocks To enable or disable the Timer Blocks...

  • Page 63: Instrument Units Page

    2704 Controller Engineering Handbook 7.2.3 INSTRUMENT Units Page Table Number: These parameters allow you to configure instrument units INSTRUMENT 7.2.3. (Units Page) Parameter Name Parameter Description Value Default Access Level Press  to select Temp Units Temperature Units None Conf...
  • Page 64 Engineering Handbook 2704 Controller Notes:- 1. The 2704 stores the user interface in 2 languages. English is always available plus French, German or Spanish. 2. The first page to be displayed when the instrument is switched on can be chosen from:-...

  • Page 65: Instrument Page Promote Page

    2704 Controller Engineering Handbook 7.2.5 INSTRUMENT Page Promote Page Any page shown un-shaded in the Navigation Diagram, section 3.3, can be promoted to Level 1, Level 2 or Level 3 as follows:- Do This This Is The Display You Should See...

  • Page 66: Instrument User Text Page

    Engineering Handbook 2704 Controller 7.2.6 INSTRUMENT User Text Page This page allows you to configure up to 100 User Text strings of up to 16 characters. Any string can be used to provide a name for particular parameters. For example Loops can be given names which are more meaningful to the user, such as ‘Zone 1’, ‘Level Controller’, etc.

  • Page 67: Instrument Summary Page

    2704 Controller Engineering Handbook 7.2.7 INSTRUMENT Summary Page These parameters allow you to configure a page consisting of a list of up to 10 parameters which are in common use on a particular installation. The first parameter in the list - ‘Show Summary’ must be enabled so that the summary list is shown in operating levels.
  • Page 68 Engineering Handbook 2704 Controller Do This This Is The Display You Should See Additional Notes To Select the First Parameter which is to Appear on the Summary Page 1. Press to select ‘Promote Up to 10 parameters are available Param’...

  • Page 69: Instrument Standby Page

    2704 Controller Engineering Handbook 7.2.7.1 Summary Page Example This is an example of a Summary Page showing five parameters produced by the above procedure. Page Name chosen from User Text Name of parameter chosen from User Text These four parameter names use the default text 7.2.8...

  • Page 70: User Text Examples

    Engineering Handbook 2704 Controller USER TEXT EXAMPLES 7.3.1 To Re-Name Loop 1 to Zone 1 First enable User Text since its factory default is disabled. A library of User Text can then be created from which the new loop name can be selected.

  • Page 71: To Rename A Digital Input And Show In The Summary Page

    2704 Controller Engineering Handbook 7.3.4 To Rename a Digital Input and show in the Summary Page This example will display the value of the digital input alongside the text ‘Test 1’ in the Summary Page for Digital Input 1. 7.3.4.1 Implementation 1.

  • Page 72: To Assign Custom Units

    Engineering Handbook 2704 Controller 7.3.5 To Assign Custom Units Most commonly used units can be selected for display on the user interface. In addition to the standard selection up to six custom units can be created. In this example the units of the PV Input will be Gal/m 7.3.5.1...

  • Page 73: Chapter 8 Programmer Configuration

    2704 Controller Engineering Handbook CHAPTER 8 PROGRAMMER CONFIGURATION This chapter explains:- The features of a setpoint programmer in general How to configure and edit a Synchronous Programmer How to configure an Asynchronous Programmer (software versions 6 onwards) Customisable Parameter Names...

  • Page 74: What Is Setpoint Programming

    The 2704 controller will program up to three separate profiles. These may be temperature, pressure, light level, humidity, etc., depending on the application, and are referred to as Profiled Setpoints (PSPs).

  • Page 75: Asynchronous Programmer

    2704 Controller Engineering Handbook 8.1.2 Asynchronous Programmer In an asynchronous programmer up to three PSPs can be run with a different number of segments, based on an independent time base. Each PSP can start at the same time or can be started individually.

  • Page 76: Setpoint Programmer Definitions

    Engineering Handbook 2704 Controller SETPOINT PROGRAMMER DEFINITIONS This section defines the more common parameters to be found when running a 2704 programmer /controller. 8.2.1 In run the programmer varies the setpoint in accordance with the profile set in the active program.

  • Page 77: Programmer Types

    2704 Controller Engineering Handbook PROGRAMMER TYPES The programmer can be configured as Time to Target or Ramp Rate. A time to target programmer requires fewer settings and is simple to use since all segments are the same. A time to target programmer can, in general contain more segments than a ramp rate.

  • Page 78: Go Back To Segment

    Engineering Handbook 2704 Controller 8.4.2 Go Back To Segment Go Back allows segments in a program to be repeated by a set number of times. It is the equivalent of inserting ‘sub-programs’ on some controllers. Figure 8-3 shows an example of a program which is required to repeat the same section a number of times and then continue the program.

  • Page 79: Wait

    2704 Controller Engineering Handbook 8.4.4 Wait An event can be configured at the end of each segment, which, when active, will cause the program to wait before progressing to the next segment. Three wait conditions are provided which may be wired, in configuration level, to an external source using digital inputs or to internal sources, e.g.

  • Page 80: Power Fail Recovery

    3. If the power is off for longer than the second time boundary, the programmer will reset. ☺ The programmer takes about 25 seconds to start running after power is applied to the 2704. This delay should be taken into consideration when setting up the Test Time recovery parameter.

  • Page 81: Holdback (Guaranteed Soak)

    2704 Controller Engineering Handbook HOLDBACK (GUARANTEED SOAK) Holdback freezes the program if the process value does not track the setpoint by an amount which can be set by the user. It may operate in any PSP type. In a Ramp it indicates that the process value is lagging the setpoint by more than a settable amount and that the program is waiting for the process to catch up.

  • Page 82: Program User Values

    Engineering Handbook 2704 Controller PROGRAM USER VALUES Program User Values provide multiplexor facilities for the user. Each user value provides storage for a number of event values (currently 127). Each user value will normally be soft wired (see Chapter 5) to call up another feature.

  • Page 83: Example: To Configure A Synchronous Programmer

    2704 Controller Engineering Handbook 8.10 EXAMPLE: TO CONFIGURE A SYNCHRONOUS PROGRAMMER If the instrument has been supplied as a programmer it will only be necessary to complete this step if the programmer feature has subsequently been disabled or it is required to change from a synchronous to...

  • Page 84: Example: To Configure Synchronous Programmer Type

    Engineering Handbook 2704 Controller 8.11 EXAMPLE: TO CONFIGURE SYNCHRONOUS PROGRAMMER TYPE The programmer is supplied as a Time to Target programmer. This section describes how to configure a Ramp Rate type:- Do This This Is The Display You Should See Additional Notes 1.
  • Page 85 2704 Controller Engineering Handbook These parameters allow you to configure Program Type and Options. Table Number: PROGRAM EDIT Press  to select each parameter 8.11.1. (Options Page) This table is only available in Configuration Level Parameter Name Parameter Description Value...

  • Page 86: Programmer Wiring

    Engineering Handbook 2704 Controller 8.12 PROGRAMMER WIRING 8.12.1 Programmer Function Block The programmer function block, shown in Figure 8-7, shows an example of soft wiring to other functions. The connections can be made using the copy and paste method described in Section 5.1.2. with the exception of the Prg.DO1 to Prg.DO16 event outputs.

  • Page 87: Program Edit Wiring Page

    2704 Controller Engineering Handbook 8.12.2 PROGRAM EDIT Wiring Page Table Number: These parameters allow you to soft wire PROGRAM EDIT programmer functions 8.12.2. (Wiring Page) This table is only available in Configuration Level Parameter Name Parameter Description Default Wiring Value Press ...

  • Page 88: To Create Or Edit A Program

    Engineering Handbook 2704 Controller 8.13 TO CREATE OR EDIT A PROGRAM To create or edit a program it is first necessary to define the parameters associated with the overall program. These parameters will be found under the page header ‘PROGRAM EDIT (Program)’, see section 8.14.1.

  • Page 89: Fine And Coarse Holdback

    2704 Controller Engineering Handbook Table Number: These parameters affect the overall program. PROGRAM EDIT 8.14.1 (Program Page) Parameter Name Parameter Description Value Default Access Level PSP1 PSP1 HBk Type Holdback type for (per program) These are deviations between SP and PV...

  • Page 90: Example: To Set Up Each Segment Of A Program

    Engineering Handbook 2704 Controller 8.15 EXAMPLE: TO SET UP EACH SEGMENT OF A PROGRAM Do This This Is The Display You Should See Additional Notes 1. From any display press access the page header menu. 2. Press to select ‘PROGRAM EDIT’...
  • Page 91 2704 Controller Engineering Handbook Table Number: PROGRAM EDIT These parameters allow you to set up each segment in the program 8.15.1. (Segment) Parameter Name Parameter Description Value Default Access Level Step PSP1 Type Profile setpoint 1 type Dwell Ramp Only shown if Program Type = Ramp Rate and program not in End...

  • Page 92: To Run A Synchronous Program

    Engineering Handbook 2704 Controller 8.16 TO RUN A SYNCHRONOUS PROGRAM PROG Press A program can only be Run, Reset or Held in Operator Level 1, 2 or 3. The program status pop up window is displayed Press to select the program to be run...

  • Page 93: Example: To View The State Of A Running Program

    2704 Controller Engineering Handbook 8.19 EXAMPLE: TO VIEW THE STATE OF A RUNNING PROGRAM If you wish to know the state of the digital outputs or times remaining, for example, then you can access the ‘PROGRAM RUN’ pages:- Do This...
  • Page 94 Engineering Handbook 2704 Controller Table Number: These parameters provide information on PROGRAM RUN (General Page) the running program. 8.19.1a Parameter Name Parameter Description Value Default Access Level programmer to run Fast Run To fast run the program Reset Program Status...
  • Page 95 2704 Controller Engineering Handbook Table Number: These parameters are associated with Profiled Setpoint number 1 PROGRAM RUN PSP1 8.19.1b Page) Parameter Name Parameter Description Value Default Access Level Seg Time Rem Segment time remaining h:m:s PSP1 Type Running segment type for profiled...

  • Page 96: Programmer Wiring Examples

    This example explains how to configure a programmer to allow one profile to generate a setpoint for three control loops. The 2704 program block can generate up to three profiled variables, which can then be internally wired to any parameter source. In most cases the PSPs are used to allow control loop setpoints to follow a pre-determined ramp/dwell sequence, but they can also be used, for example, to retransmit a setpoint to a slave device.

  • Page 97: Two Profiles, Two Loops

    8.20.2 Two Profiles, Two Loops This example explains how to configure a 2704 programmer to generate two setpoints which are then used to profile the setpoint for two independent control loops. In this example PSP1 and PSP2 are soft wired to the program setpoints of loop 1 and loop 2 respectively. Also, the PV of loop1 is wired to the PV1 source, to provide holdback, and the PSP1 reset source, to provide servo start.

  • Page 98: Asynchronous Programmer

    Engineering Handbook 2704 Controller 8.21 ASYNCHRONOUS PROGRAMMER A summary of the functions available in the asynchronous programmer is given below:- Creation of programs is the same as for the synchronous programmer, thus allowing for a different number of segments for each PSP.

  • Page 99: Program Groups

    2704 Controller Engineering Handbook 8.22 PROGRAM GROUPS Up to three PSPs can be programmed into a single Program Group. Example 1: Run Group 1 You may wish to run a Temperature program, a Pressure program and a Humidity program in a particular application.

  • Page 100: Example: To Configure An Asynchronous Programmer

    Engineering Handbook 2704 Controller 8.23 EXAMPLE: TO CONFIGURE AN ASYNCHRONOUS PROGRAMMER If the instrument has been supplied as a programmer it will only be necessary to complete this step if the programmer feature has subsequently been disabled or it is required to change from a synchronous to...

  • Page 101: Example: To Configure Asynchronous Programmer Type

    2704 Controller Engineering Handbook 8.24 EXAMPLE: TO CONFIGURE ASYNCHRONOUS PROGRAMMER TYPE The programmer is supplied as a Time to Target programmer. This section describes how to configure a Ramp Rate type:- Do This This Is The Display You Should See...

  • Page 102: Program Groups Wiring Page

    Engineering Handbook 2704 Controller 8.24.2 PROGRAM GROUPS Wiring Page Table Number: These parameters allow you to configure the internal soft wiring PROGRAM GROUPS connections for the Program Groups. 8.24.2. (Wiring Page) This page is only available in configuration level Parameter Name...

  • Page 103: Profile Setpoint

    2704 Controller Engineering Handbook 8.25 PROFILE SETPOINT PAGES These pages are similar to the PROGRAM EDIT page available in the synchronous programmer. They allow you to configure and set up each PSP. There are six pages:- The Options page available in configuration level only. Allows configuration of overall parameters associated with the PSP such as limits, PSP names, units, etc The Wiring page available in configuration level only.
  • Page 104 Engineering Handbook 2704 Controller Table Number: These parameters allow you to configure parameters PSP1 (2 or 3) PROFILE associated with the PSP. 8.25.1. (Options Page) Parameter Name Parameter Description Value Default Press  to select XXXXX PSP1 Rate Res PSP1 rate resolution XXXX.X...

  • Page 105: Psp1 (2 Or 3) Profile Wiring

    2704 Controller Engineering Handbook 8.25.2 PSP1 (2 or 3) PROFILE Wiring This table is only available in Configuration Level Table Number: These parameters allow you to soft PSP1 (2 or 3) PROFILE wire programmer functions. 8.25.2. (Wiring Page) Parameter Name...
  • Page 106 Engineering Handbook 2704 Controller These parameters provide running information of the PSP PSP1 (2 or 3) PROFILE Table Number: This page is available in operator and configuration level (Run General) 8.25.3 Parameter Parameter Description Value Default Access Level Name Time Remaining...
  • Page 107 2704 Controller Engineering Handbook These parameters provide running information of the PSP PSP1 (2 or 3) PROFILE Table Number: This page is available in operator and configuration level (Run General) 8.25.3 Parameter Parameter Description Value Default Access Level Name Dos’ = ‘No’...

  • Page 108: Psp1 (2 Or 3) Profile Run Segment

    Engineering Handbook 2704 Controller 8.25.4 PSP1 (2 OR 3) PROFILE Run Segment Pages Table Number: These parameters show the running conditions in each segment PSP1 (2 or 3) PROFILE of the running program 8.25.4 (Run Segment Page) Parameter Name Parameter Description...

  • Page 109: Psp1 (2 Or 3) Profile Program Edit Parameters

    2704 Controller Engineering Handbook 8.25.5 PSP1 (2 OR 3) PROFILE Program Edit Parameters This page is similar to the PROGRAM EDIT (Program Page) in the synchronous programmer Table Number: These parameters set up the overall program. PSP1 (2 or 3) PROFILE 8.25.5...

  • Page 110: Psp1 (2 Or 3) Profile Segment Parameters

    Engineering Handbook 2704 Controller 8.25.6 PSP1 (2 or 3) PROFILE Segment Parameters This page is similar to the PROGRAM EDIT (Segment Page) in the synchronous programmer Table Number: These parameters allow you to set up each segment in the program PSP1 (2 or 3) PROFILE 8.25.6.
  • Page 111 2704 Controller Engineering Handbook Table Number: These parameters allow you to set up each segment in the program PSP1 (2 or 3) PROFILE 8.25.6. (Segment Edit) Parameter Name Parameter Description Value Default Access Level GoBack to Seg Allows repeat segments to be set up within 1 to no.

  • Page 112: Example: To Set Up And Run Program Groups

    Engineering Handbook 2704 Controller 8.26 EXAMPLE: TO SET UP AND RUN PROGRAM GROUPS Using the two examples from section 8.22 and the general navigation procedures:- Do This This Is The Display You Should See Additional Notes Set up a temperature program in See section 8.25.5 for the full list...

  • Page 113: Example: To Copy A Program

    2704 Controller Engineering Handbook 8.27 EXAMPLE: TO COPY A PROGRAM Do This This Is The Display You Should See Additional Notes From any display press access the page header menu. Press to select ‘PROFILE SP1’ Press to select sub-headers Press to select ‘Program Edit’...

  • Page 114: Example: To Insert A Segment Into A Program

    Engineering Handbook 2704 Controller 8.28 EXAMPLE: TO INSERT A SEGMENT INTO A PROGRAM Do This This Is The Display You Should See Additional Notes From any display press access the page header menu. Press to select ‘PROFILE SP1’ Press to select sub-headers...

  • Page 115: Example: To Run A Program Using The Prog Button

    2704 Controller Engineering Handbook 8.31 EXAMPLE: TO RUN A PROGRAM USING THE PROG BUTTON Do This This Is The Display You Should See Additional Notes The Run Group Status pop-up will be shown. The following conditions may be selected:- From any display Press...

  • Page 116: Asynchronous Programmer Status Bar

    Engineering Handbook 2704 Controller 8.31.1 Asynchronous Programmer Status Bar The programmer status bar is shown in the top right hand corner of the loop overview displays (as selected by the LOOP button). They are shown as PSP1 PSP2 PSP3 The view shown here is applicable when Groups are used. The...

  • Page 117: Chapter 9 Digital Programmer

    2704 Controller Engineering Handbook CHAPTER 9 DIGITAL PROGRAMMER WHAT IS THE DIGITAL PROGRAMMER? The digital programmer provides a timed control of a single digital output. It may be used during any segment of a Setpoint Programmer or it may be used independently of the Setpoint Programmer.

  • Page 118: To Edit The Digital Programmer

    Engineering Handbook 2704 Controller TO EDIT THE DIGITAL PROGRAMMER Do This This Is The Display You Should See Additional Notes 1. From any display press access the page header menu. 2. Press to select ‘DIGITAL PROG’ 3. Press to show sub-headers 4.

  • Page 119: Digital Program 1 To 4 Page

    2704 Controller Engineering Handbook 9.2.2 Digital Program 1 to 4 Page Table Number: These parameters are associated with Digital Programs 1 to 4 DIGITAL PROG 9.2.2. (Dig Prog x Page) Parameter Name Parameter Description Value Default Access Level Reset Src...

  • Page 120: Cascade Trim Mode - Earlier Controllers

    Engineering Handbook 2704 Controller CASCADE TRIM MODE – EARLIER CONTROLLERS This section applies only to controllers built before April 2001 with software versions 3 or less. Controllers built after this date have software version 4.0 or greater and use the cascade trim block diagram shown in the previous sections.

  • Page 121: Chapter 10 Alarm Operation

    2704 Controller Engineering Handbook CHAPTER 10 ALARM OPERATION 10.1 DEFINITION OF ALARMS AND EVENTS Alarms are used to alert an operator when a pre-set level or condition has been exceeded. They are normally used to switch an output - usually a relay - to provide interlocking of the machine or plant or external audio or visual indication of the condition.

  • Page 122: Types Of Alarm Used In 2704 Controller

    TYPES OF ALARM USED IN 2704 CONTROLLER This section describes graphically the operation of different types of alarm used in the 2704 controller. The graphs show measured value plotted against time. The measured value may be any analogue value available in the controller.

  • Page 123: Deviation Low Alarm

    2704 Controller Engineering Handbook 10.2.4 Deviation Low Alarm The alarm occurs when the difference between the process variable and the setpoint is negative by greater than the alarm setpoint. Note: For User Alarms the deviation is the difference between the two user wired analogue inputs.

  • Page 124: Rate Of Change Alarm (Negative Direction)

    Engineering Handbook 2704 Controller 10.2.6 Rate Of Change Alarm (Negative Direction) The Process Value falls faster than the alarm setting. Alarm On ↑ Alarm Off Negative Rate of Change set to x units per min Actual rate of change > x units per ↓...

  • Page 125: Blocking Alarms

    2704 Controller Engineering Handbook 10.3 BLOCKING ALARMS A Blocking Alarm only occurs after it has been through a start up phase It is typically used to prevent alarms from being indicated until the process has settled to its normal working conditions.

  • Page 126: Latching Alarms

    Engineering Handbook 2704 Controller 10.4 LATCHING ALARMS The alarm is indicated until it is acknowledged by the user. Acknowledgement of an alarm can be through the controller front buttons, from an external source using a digital input to the controller or through digital communications.

  • Page 127: Grouped Alarms

    2704 Controller Engineering Handbook 10.4.3 Grouped Alarms Alarms can be associated with different aspects of the process. They are grouped in accordance with the functions they perform as follows: Loop Alarms Alarms associated with each control loop. Examples are: High, Low, Deviation and Rate of Change.

  • Page 128: To Configure An Alarm

    Engineering Handbook 2704 Controller 10.6 TO CONFIGURE AN ALARM The example below is shows how to configure a Loop 1 Alarm. Each loop has two alarms, shown on the display as Alm1 and Alm2. The procedure described below is the same for all alarms.

  • Page 129: Alarm Tables

    2704 Controller Engineering Handbook Do This This Is The Display You Should See Additional Notes To Configure Alarm Blocking, Alarm Setpoint, Alarm Hysteresis, Alarm Delay, Alarm Inhibit 1. Press to scroll to the parameter 2. Press to choose the condition or value...

  • Page 130: Alarms (Summary Page)

    Engineering Handbook 2704 Controller 10.7.1 ALARMS (Summary Page) Table Number: These parameters indicate alarm status ALARMS 10.7.1. Alarm parameters in this table only appear if the function is enabled. (Summary Page) The last three parameters always appear. Parameter Name Parameter Description...

  • Page 131: Alarms Lp1 (2 Or 3) Page Parameters

    2704 Controller Engineering Handbook 10.7.2 ALARMS LP1 (2 Page Parameters Table Number: These parameters configure the Loop alarms. ALARMS Alarm 1 parameters only appear if the ‘Alm 1 Type’ ≠ ‘None’ 10.7.2. LP1 (2 Alarm 2 parameters only appear if the ‘Alm 2 Type’ ≠ ‘None’...

  • Page 132: Alarms (Pv Input Page) Parameters

    Engineering Handbook 2704 Controller 10.7.3 ALARMS (PV Input Page) Parameters Table Number: These parameters set up the alarms associated with the PV input ALARMS signal. 10.7.3. (PV Input) They are only displayed if enabled using the parameter FS Hi Alarm or...

  • Page 133: Alarms (User 1 To 8 Page) Parameters

    2704 Controller Engineering Handbook 10.7.6 ALARMS (User 1 to 8 Page) Parameters Table Number: These parameters set up user defined alarms. ALARMS 10.7.6. (User 1) (to User 8) Parameter Name Parameter Description Value Default Access Level Type Alarm Type As order...

  • Page 134: Alarm Wiring Examples

    Engineering Handbook 2704 Controller 10.8 ALARM WIRING EXAMPLES 10.8.1 Control Loop With High and Low Alarms In this example two alarms are added to the loop wiring example shown in Section 5.1.1. Alarm 1 is configured as a high alarm and operates the fixed relay ‘AA’. This relay is inhibited until a digital input, ‘DIO1’ becomes true.

  • Page 135: Loop Alarm Inhibited If Programmer Not In Run

    2704 Controller Engineering Handbook 10.8.2 Loop Alarm Inhibited if Programmer not in Run In this example the alarm is gated as in the previous example. To determine if the programmer is in Run mode an Analogue Operator (An Oper 1) may be used.

  • Page 136: Chapter 11 Loop Set Up

    11.1 WHAT IS LOOP SET UP The 2704 controller can have up to three control loops. Each loop operates independently and can be configured for On/Off, PID or Valve Positioning control. Additionally, each loop can have an auxiliary loop associated with it, and this allows other control strategies to be implemented such as cascade, ratio and override control.

  • Page 137: Loop Set Up (Options Page)

    2704 Controller Engineering Handbook 11.1.1 LOOP SET UP (Options page) Table Number: This page determines the control action SETUP 11.1.1. See notes for further parameter descriptions Options Page Parameter Name Parameter Description Value Default Access Level Loop Type To configure loop type...
  • Page 138 Engineering Handbook 2704 Controller Table Number: This page determines the control action SETUP 11.1.1. See notes for further parameter descriptions Options Page Parameter Name Parameter Description Value Default Access Level (12) Start SRL Mode Defines Setpoint Rate Limit action None No Change...
  • Page 139 2704 Controller Engineering Handbook 7. Force Manual Mode Force Manual Mode allows you to select how the loop behaves on auto/ manual transfer. Transfer between auto/manual/auto takes place bumplessly Track Transfer from auto to manual, the output reverts to the previous manual value.

  • Page 140: Single Loop Control

    Engineering Handbook 2704 Controller 11.2 SINGLE LOOP CONTROL Single loop control is configured when ‘Loop Type’ (Options Page) = ‘Single’. A block diagram of a simple single loop, single output controller is shown below: Setpoint Block Section 11.3.1 Wkg SP...

  • Page 141: Setpoint Definition

    2704 Controller Engineering Handbook 11.3 SETPOINT DEFINITION The controller setpoint is the Working Setpoint which may be sourced from a number of alternatives. This is the value ultimately used to control the process variable in a loop. LSP derives from a parameter called the local setpoint which is the value which the operator can alter. This local SP may be derived from one of two setpoints, Setpoint 1 or Setpoint 2.

  • Page 142: Setpoint Parameters

    Engineering Handbook 2704 Controller 11.3.2 Setpoint Parameters Table Number: This list allows you to configure SP parameters SETUP 11.3.2. Other parameters are available in operation levels (SP Page) Parameter Name Parameter Description Value Default Access Level Range Min PV low limit...

  • Page 143: Lp1 Setup (Sp Aux) Page

    2704 Controller Engineering Handbook 11.3.3 SETUP (SP Aux) Page Table Number: This list allows you to configure auxiliary loop setpoint limits. It only SETUP appears if cascade or override control is configured, see sections 11.3.3 (SP Aux) Page 11.10. and 11.12.

  • Page 144: Pid Control

    Engineering Handbook 2704 Controller 11.4 PID CONTROL PID control, also referred to as ‘Three Term Control’, is a technique used to achieve stable straight line control at the required setpoint. The three terms are: P Proportional band Integral time D Derivative time The output from the controller is the sum of the contributions from these three terms.

  • Page 145: Pid Block Diagram

    2704 Controller Engineering Handbook 11.4.5 PID Block Diagram Control Action Remote feedforward * Direct SP High Limit Feedforward Integral Hold Reverse SP Low Limit FF.dv Integral (or Man Rst) Derivative Action -FF.dv OP.Hi Error Range Max OP.Lo Derivative PID OP...

  • Page 146: Gain Scheduling

    Soft Wired To a parameter chosen by the user. The 2704 controller has six sets of PID values – the maximum number which you may wish to use is set up in Loop SETUP/PID ‘Num of Sets’ parameter. You can select the active set from: 1.

  • Page 147: To Configure Gain Scheduling

    2704 Controller Engineering Handbook 11.5.1 To Configure Gain Scheduling:- Do This This Is The Display You Should See Additional Notes LP 2 LP 3 Alternatives are 1. From any display press These only appear in the list if many times as necessary to access...
  • Page 148 Engineering Handbook 2704 Controller Table Number: These parameters allow you to configure PID sets SETUP 11.5.2. (PID Page) Parameter Name Parameter Description Value Default Access Level Schedule Type Scheduling type Conf Error Rem Sched IP Wired Num of Sets Number of PID sets to use...

  • Page 149: Pid (Aux) Parameters

    2704 Controller Engineering Handbook 11.5.3 PID (Aux) Parameters Table Number: These parameters allow you to set up the PID sets.(Override & SETUP Cascade only) 11.5.3. PID(Aux) Page Parameter Name Parameter Description Value Default Access Level Display range Rem Sched IP...

  • Page 150: Output Parameters

    Engineering Handbook 2704 Controller 11.6 OUTPUT PARAMETERS Typically the output(s) of the PID function block are wired to: • The standard relay or logic outputs, configured for on/off or time proportioning pulses • Relay, triac or logic output module, configured for on/off or time proportioning pulses •...

  • Page 151: Motorised Valve Control

    11.7 MOTORISED VALVE CONTROL The 2704 controller can be used for motorised valve control as an alternative to the standard PID control algorithm. This algorithm is designed specifically for positioning motorised valves. It operates in boundless or bounded mode as configured by the ‘Control Type’ parameter in section 11.1.1. Boundless VP control does not require a position feedback potentiometer for control purposes.

  • Page 152: Diagnostics

    Engineering Handbook 2704 Controller 11.8 DIAGNOSTICS Diagnostic parameters are available at all levels, are read only and provide information on the current operating conditions of the controller. 11.8.1 Diagnostic Page Table Number: This list allows you to interrogate operating conditions of the loop...

  • Page 153: Display

    2704 Controller Engineering Handbook 11.9 DISPLAY The Summary Page, displayed in Operation levels, (see the Navigation Diagram, section 3.3) consists of up to 10 parameters which are in common use on a particular process. These parameters are ‘promoted’ to this display using the following table.

  • Page 154: Cascade Control

    Engineering Handbook 2704 Controller 11.10 CASCADE CONTROL 11.10.1 Overview Cascade control is classified as an advanced control technique used, for example, to enable processes with long time constants to be controlled with the fastest possible response to process disturbances, including setpoint changes, whilst still minimising the potential for overshoot.

  • Page 155: 11.10.3 Trim Mode

    Feedforward can also be a user defined variable in trim mode in the same way as full scale mode The implementation of cascade control in the 2704 is available as a standard option. ie it is not necessary to order a dual loop controller to perform cascade control.

  • Page 156: 11.10.5 Cascade Controller Block Diagrams

    Engineering Handbook 2704 Controller 11.10.5 Cascade Controller Block Diagrams CSD FFwd Src (not included in version 4.0) Slave LSP FeedFwT Master WSP Master PV Trim Limit Scale to Slave PV units SPHi User wire SP Limit Slave SP *(AuxHR-AuxLR) Master OP...

  • Page 157: 11.10.6 Loop Setup (Wiring Page) For Cascade Loop

    2704 Controller Engineering Handbook 11.10.6 LOOP SETUP (Wiring page) for Cascade Loop A controller is configured for cascade operation if ‘Loop Type’= ‘Cascade’ in ‘LOOP SETUP(Options)’ page, (section 11.1.1). Table Number: These parameters allow you to soft wire between function blocks.

  • Page 158: 11.10.7 Cascade Parameters

    Engineering Handbook 2704 Controller 11.10.7 Cascade Parameters Table Number: This list only appears if cascade is configured, (see section 11.1.1) and SETUP allows you to set up parameters specific to cascade controllers. 11.10.7. (Cascade Page) Parameter Name Parameter Description Value...

  • Page 159: 11.10.8 Cascade Wiring Example

    2704 Controller Engineering Handbook 11.10.8 Cascade Wiring Example This example shows how to configure Loop 1 to be a simple cascade controller. The master PV is connected to the Main PV input and the slave PV is connected to a PV Input module fitted in Slot 3. The control output is a 4- 20mA signal which uses a DC control module fitted in Slot 1.

  • Page 160: Ratio Control

    11.11.2 Basic Ratio Control The 2704 contains a ratio control function block which can be used in any control loop. Figure 11-12 shows a block diagram of a simple ratio controller. The lead PV is multiplied or divided by the ratio setpoint to calculate the desired control setpoint.

  • Page 161: 11.11.3 Controller Configured For Ratio

    2704 Controller Engineering Handbook 11.11.3 Controller Configured For Ratio A controller is configured for ratio operation if ‘Loop Type’= ‘Ratio’ in ‘LOOP SETUP(Options)’ page, (section 11.1.1.). Table Number: These parameters allow you to soft wire between function blocks. SETUP 11.11.3.

  • Page 162: 11.11.4 Ratio Parameters

    Engineering Handbook 2704 Controller 11.11.4 Ratio Parameters Table Number: This list only appears if ratio is configured (see section 11.1.1.) and SETUP allows you to set up parameters specific to ratio controllers. 11.11.4. (Ratio Page) Parameter Name Parameter Description Value...

  • Page 163: 11.11.5 Ratio Wiring Example

    2704 Controller Engineering Handbook 11.11.5 Ratio Wiring Example This example shows how to configure Loop 1 to be a simple ratio controller. The main PV is connected to the PV Input (rear terminals V+ & V-) and the lead PV is connected to the Analogue Input (rear terminals BA & BB).

  • Page 164: Overide Control

    Engineering Handbook 2704 Controller 11.12 OVERIDE CONTROL 11.12.1 Overview Override Control allows a secondary control loop to override the main control output in order to prevent an undesirable operating condition. The override function can be configured to operate in either minimum, maximum or select mode.

  • Page 165: 11.12.3 Sensor Break Action

    2704 Controller Engineering Handbook 11.12.3 Sensor Break Action As from firmware version 6.10 the action of the control loops during sensor break will be determined by the Sensor Break Type parameter (Sbrt). 11.12.4 Sensor Break Type = Output (0) In this mode then no matter which sensor fails the output will go to the Sensor Break Power (oSbOP).

  • Page 166: 11.12.9 Controller Configured For Override

    Engineering Handbook 2704 Controller 11.12.9 Controller Configured For Override A controller is configured for override operation if ‘Loop Type’= ‘Override’ in ‘LOOP SETUP(Options)’ page, (section 11.1.1). Table Number: These parameters allow you to soft wire between function blocks. SETUP 11.12.9.

  • Page 167: 11.12.10 Override Parameters

    2704 Controller Engineering Handbook 11.12.10 Override Parameters Table Number: This list only appears if override is configured (see section 11.1.1.) SETUP and allows you to set up parameters specific to override controllers 11.12.10. (Override Page) Parameter Name Parameter Description Value...

  • Page 168: 11.12.11 Override Wiring Example

    Engineering Handbook 2704 Controller 11.12.11 Override Wiring Example This example shows how to configure Loop 1 to be a simple override furnace temperature controller. The main PV is connected to the PV Input (rear terminals V+ & V-) and the override PV is connected to a PV Input module fitted in slot 3 (rear terminals 3C &...

  • Page 169: Loop2 Set Up

    2704 Controller Engineering Handbook 11.13 LOOP2 SET UP All pages listed in the previous sections are repeated for Loop 2. 11.14 LOOP3 SET UP All pages listed in the previous sections are repeated for Loop 3. Part No HA026933 Issue 7.0 Nov-12...

  • Page 170: Chapter 12 Tuning

    Table 12-1: Tuning Parameters 12.2 AUTOMATIC TUNING The 2704 controller uses a one-shot tuner which automatically sets up the initial values of the three term parameters. 12.2.1 One-shot Tuning The ‘one-shot’...

  • Page 171: To Autotune Contol Loop Lp1

    2704 Controller Engineering Handbook 12.3 TO AUTOTUNE CONTOL LOOP In most cases it will only be necessary to carry out the Autotune procedure when commissioning your controller. Do This This Is The Display You Should See Additional Notes Set the setpoint to the value at which you will normally operate the process .

  • Page 172: Carbon Potential Control

    Engineering Handbook 2704 Controller Typical automatic tuning cycle Setpoint Tuning normally takes place at a PV which has a value of Setpoint X 0.7. Time Calculation of the cutback values Low cutback High cutback are values that restrict the amount of overshoot, or undershoot, that occurs during large step changes in PV (for example, under start-up conditions).

  • Page 173: Autotune Parameters

    2704 Controller Engineering Handbook 12.3.2 Autotune Parameters Table Number: These parameters allow you to autotune the loop AUTOTUNE 12.3.2. Parameter Name Parameter Description Value Default Access Level - 1 0 0 t o 1 0 0 % Tune OL Auto tune low power limit.

  • Page 174: Manual Tuning

    Engineering Handbook 2704 Controller 12.4 MANUAL TUNING If for any reason automatic tuning gives unsatisfactory results, you can tune the controller manually. There are a number of standard methods for manual tuning. The one described here is the Ziegler-Nichols method.

  • Page 175: Integral Action And Manual Reset

    2704 Controller Engineering Handbook 12.4.2 Integral action and manual reset In a full three-term controller (that is, a PID controller), the integral term automatically removes steady state errors from the setpoint. If the controller is set up to work in two-term mode (that is PD mode), the integral term will be set to ‘OFF’.

  • Page 176: Tuning When Gain Scheduling Is Used

    Engineering Handbook 2704 Controller 12.5 TUNING WHEN GAIN SCHEDULING IS USED Gain scheduling is described in section 11.5. It is the automatic transfer of control between one set of control values and another set in non-linear control systems. Up to six sets can be configured and each set is configured to operate over a selected input range where the control operates over a reduced and approximately linear range.

  • Page 177: Cascade Tuning

    2704 Controller Engineering Handbook 12.6 CASCADE TUNING Cascade control uses a combination of two PID controllers, where the output of one (the master) provides the setpoint for the second (the slave). Cascade control was described in more detail in section 11.10. Figure 12-2 shows a cascade controller applied to the control of a furnace load.

  • Page 178: To Tune A Full Scale Cascade Loop

    Engineering Handbook 2704 Controller 12.6.1 To Tune a Full Scale Cascade Loop Step 1. Configure the loop as cascade full scale as follows:- SETUP/Options Page (section 11.1.1.) Set ‘Loop Type’ = Cascade SETUP/Cascade Page (section 11.10.7.) Set ‘Cascade Mode’ = Full Scale Set ‘Disable CSD’...

  • Page 179: To Tune A Trim Mode Cascade Loop

    2704 Controller Engineering Handbook 12.6.2 To Tune a Trim mode Cascade Loop This example uses SP feedforward where the value of the MasterWSP is 50, the slave range is 0-200 and the Trim limits are 25%. The slave setpoint calculation is shown in the diagram below which has been reproduced from the previous chapter.
  • Page 180 Engineering Handbook 2704 Controller 12.6.2.1 Tuning the Loop Details of configuration Master(LP1) loop range = 0-100 Slave loop(LP1A) range = 0-200 Cascade mode = Trim SPFF(Setpoint feedforward) CSDTrim lo = -50(slave SP trim lo limit) CSDTrim hi = +50(slave SP trim hi limit) Step 1.

  • Page 181: Chapter 13 Controller Applications

    2704 Controller Engineering Handbook CHAPTER 13 CONTROLLER APPLICATIONS The 2704 controller contains control blocks specifically designed to suit a number of different applications. Examples are:- Carbon Potential, Oxygen or Dew Point control using Zirconia probes Humidity control using wet and dry platinum resistance thermometers...

  • Page 182: Zirconia - Carbon Potential Control

    ZIRCONIA - CARBON POTENTIAL CONTROL A dual loop 2704 controller is required to control temperature of the process on one loop and carbon potential on the other. The controller is often a programmer which generates temperature and carbon potential profiles synchronised to a common timebase.

  • Page 183: Example Of Carbon Potential Controller Connections

    Source Figure 13-1: An Example of 2704 Wiring for Carbon Potential Control The above diagram is a generalised connection diagram, for further information refer to ‘INSTALLATION’ Chapter 2, and to the instructions supplied by the probe manufacturer. In the above example the following modules are fitted. This will change from installation to installation:...

  • Page 184: To View And Adjust Zirconia Parameters

    Engineering Handbook 2704 Controller 13.2 TO VIEW AND ADJUST ZIRCONIA PARAMETERS Do This This Is The Display You Should See Additional Notes This page is only available if 1. From any display press ‘Zirconia’ is Enabled in the many times as necessary to access...
  • Page 185 2704 Controller Engineering Handbook Table Number: This table allows you to view or adjust zirconia probe parameters ZIRCONIA PROBE 13.2.1. (Options Page) Parameter Name Parameter Description Value Default Access Level varying abilities of different alloys to absorb carbon. Applies to MMI probes only...

  • Page 186: Wiring Page

    Engineering Handbook 2704 Controller 13.2.2 Wiring Page Table Number: These parameters configure zirconia probe block wiring. ZIRCONIA PROBE 13.2.2. (Wiring Page) Parameter Name Parameter Description Value Default Access Level mV Src Zirconia probe mV input source Modbus address Conf Temp Src...

  • Page 187: Configuration Of A Carbon Potential Control Loop

    2704 Controller Engineering Handbook 13.3.2 Configuration of a Carbon Potential Control Loop This example assumes that the probe temperature (Type K) input is connected to module 3 and the milli-volt input to module 6. Loop 1 normally controls temperature, so the carbon loop will be Loop 2. Carbon control and alarm outputs are relays and configured as On/Off.

  • Page 188: Probe Impedance

    Engineering Handbook 2704 Controller This value defines the % carbon monoxide (%CO) in the gas used for carburising This configures the zirconia probe 6. In ZIRCONIA PROBE/Wiring set ’Clean Src’ = 05402:DI01.Val Page (section 0) set ‘mV Src’ = 04948:Mod6A set ‘Temp Src’...

  • Page 189: Humidity Control

    13.4.1 Overview Humidity (and altitude) control is a standard feature of the 2704 controller. In these applications the controller may be configured to generate a setpoint profile (see Chapter 8 ‘PROGRAMMER CONFIGURATION’). Also the controller may be configured to measure humidity using either the traditional Wet/Dry bulb method (Figure 13-4) or it may be interfaced to a solid state sensor.

  • Page 190: Temperature Control Of An Environmental Chamber

    Engineering Handbook 2704 Controller 13.4.3 Temperature Control Of An Environmental Chamber The temperature of an environmental chamber is controlled as a single loop with two control outputs. The heating output time proportions electric heaters, usually via a solid state relay. The cooling output operates a refrigerant valve which introduces cooling into the chamber.

  • Page 191: To View And Adjust Humidity Parameters

    2704 Controller Engineering Handbook 13.5 TO VIEW AND ADJUST HUMIDITY PARAMETERS Do This This Is The Display You Should See Additional Notes This page is only available if 1. From any display press ‘Humidity’ is Enabled in the many times as necessary to access...

  • Page 192: Humidity Wiring Example

    Engineering Handbook 2704 Controller 13.6 HUMIDITY WIRING EXAMPLE 13.6.1 The Humidity Function Block Humidity Humid.Rel Dry Bulb Src Dew Point Wet Bulb Src Sensor Failure Atm Press Src Pmtric Cst Src Figure 13-5: Humidity Function Block 13.6.1.1 Main Features Calculation of PV: The Process Variable can be Relative Humidity or Dewpoint. The PV is derived from the wet and dry bulb inputs and atmospheric pressure.
  • Page 193 2704 Controller Engineering Handbook 5. In HUMIDITY/Wiring Page (section set ‘Dry Bulb Src = 05108:PVIn.Val 13.5.2) set ‘Wet Bulb Src = 04468:Mod3A.Val This connects the sensors to the humidity block 6. In LP2 SETUP/Options Page set ‘Control Type’ = PIDCh1 PIDCh2 (section 11.1.1)

  • Page 194: Vacuum Controller

    The 2704 vacuum controller allows for the use of up to three measurement gauges. Typically these are low vacuum gauges such as the Pirani, or higher vacuum gauges such as the Penning or Inverted Magnetron. It is...

  • Page 195: Vacuum Controller Functionality

    13.8 VACUUM CONTROLLER FUNCTIONALITY The 2704 vacuum controller provides on/off outputs to the vacuum system, but, used in conjunction with the existing PID loops, provides the ability to control the temperature within the chamber or furnace. It provides the following features...

  • Page 196: Roughing Pump Timeout

    Engineering Handbook 2704 Controller 13.8.5 Roughing Pump Timeout When starting the chamber the roughing pump is run to get the chamber down to an initial level before the high vacuum pump is started. If a level of vacuum is not reached in a time (both of which are settable by the user) then the roughing pump timeout status is set.

  • Page 197: Wiring Connections

    2704 Controller Engineering Handbook 13.9 WIRING CONNECTIONS The actual wiring of the vacuum controller depends upon the number and type of modules fitted. Figure 13-10 below shows wiring for the following configuration:- • Fixed PV Input assigned as Thermocouple Input •...

  • Page 198: Switch On

    Engineering Handbook 2704 Controller 13.10 SWITCH ON Install and wire up the controller in accordance with the types of modules fitted and the configuration of the controller and switch on. A short self-test sequence takes place during which the controller identification is displayed together with the version number of the software fitted.

  • Page 199: Operation

    2704 Controller Engineering Handbook 13.11 OPERATION On a new instrument the vacuum controller can only be operated in access level 3. To enter access level 3 see Chapter 6. However, it is possible to promote commonly used parameters to level 1. If this has been done the principle of operation in level 1 is the same as described below.

  • Page 200: Parameter Tables

    Engineering Handbook 2704 Controller 13.12 PARAMETER TABLES The following tables list all parameters, which are available in all levels (including configuration level). They are accessed using the principle described in the previous section. 13.12.1 High Vacuum Parameter Tables High Vacuum...

  • Page 201: 13.12.4 Gauge Switching Parameter Tables

    2704 Controller Engineering Handbook 13.12.4 Gauge Switching Parameter Tables Table Number: These parameters allow you to set up the conditions for transfer from Gauge Switch one gauge to another. See also section 13.8.7. 13.12.4. Parameter Name Parameter Description Value Default...

  • Page 202: 13.12.7 Leak Detect Parameter Tables

    Engineering Handbook 2704 Controller 13.12.7 Leak Detect Parameter Tables Table Number: These parameters allow you to set up and configure the leak detection Leak Detect criterion. See also section 13.8.6. 13.12.7. Parameter Name Parameter Description Value Default Access Level Vacuum Select...

  • Page 203: Configuration Level

    2704 Controller Engineering Handbook 13.13 CONFIGURATION LEVEL In configuration level you can choose the way in which you want the controller to operate, the format of the operator display, the name of the chamber in use and the names of the gauges. The parameters available have already been listed in the preceding tables.

  • Page 204: 13.13.2 To Customise The Vacuum Summary Page

    Engineering Handbook 2704 Controller 13.13.2 To Customise the Vacuum Summary Page The vacuum summary page can be customised using the parameters listed in section 13.12.8. Do This This Is The Display You Should See Additional Notes 1. Select the VACUUM/Display page To Select the Second Display 2.

  • Page 205: Vacuum Controller Wiring Examples

    2704 Controller Engineering Handbook 13.14 VACUUM CONTROLLER WIRING EXAMPLES The vacuum function block may be internally wired in software to control specific applications. Soft Wiring is described in Chapter 5. 13.14.1 Simple Temperature and Vacuum Control The following example is included to show the principle of wiring between function blocks. It is not necessarily intended to be a complete solution to an application.
  • Page 206 Engineering Handbook 2704 Controller 13.14.1.1 Implementation 1. In VACUUM/Low Vacuum Page set ’Gauge Src’ = 04948: Mod6A.Val (section 13.12.2) This connects the low vacuum gauge, connected to module 3 input, to low vacuum gauge source 2. In VACUUM/High Vacuum Page set ’Gauge Src’...

  • Page 207: 13.14.2 To Scale Vacuum Readout In Other Units

    2704 Controller Engineering Handbook 13.14.2 To Scale Vacuum Readout in Other Units The vacuum units in the software version covered by this supplement are mbar only. To scale to alternative units use ‘Analogue Operators’ described Chapter 18. In a two gauge system it is necessary to scale both gauges independently. In a single gauge system the low vacuum gauge is taken as the reference.

  • Page 208: Chapter 14 Input Operators

    14.1 WHAT ARE INPUT OPERATORS The 2704 controller can have three control loops. Each loop can be independently configured to the process to be controlled. This has been described in Chapters 12 and 13 for PID, Cascade, Ratio, Override, Humidity Control, etc.

  • Page 209: Custom Linearisation

    2704 Controller Engineering Handbook 14.2 CUSTOM LINEARISATION The linearisation uses a 16 point straight line fit. Figure 14-1 shows an example of a curve to be linearised and is used to illustrate the terminology used for the parameters found in the INPUT OPERS (Cust Lin Page).

  • Page 210: To View And Adjust Input Operator Parameters

    Engineering Handbook 2704 Controller 14.3 TO VIEW AND ADJUST INPUT OPERATOR PARAMETERS Do This This Is The Display You Should See Additional Notes This page is only available if ‘Input 1. From any display press Opers’ is Enabled in the...

  • Page 211: Thermocouple/Pyrometer Switching

    2704 Controller Engineering Handbook 14.4 THERMOCOUPLE/PYROMETER SWITCHING This facility is commonly used in wide range temperature applications where it is necessary to control accurately over the range. A thermocouple may be used to control at lower temperatures and a pyrometer then controls at very high temperatures.

  • Page 212: To Set Up Input Operators (Monitor)

    14.6 BCD INPUT An available option with the 2704 is the Binary Coded Decimal (BCD) function block. This feature is normally used to select a program number by using panel mounted BCD decade switches. A configuration example for this block is given in Section 14.7.2.

  • Page 213: Bcd Parameters

    2704 Controller Engineering Handbook 14.6.2 BCD Parameters Table Number: This page allows you to configure the BCD input values INPUT OPERS 14.6.2. (BCD Input Page) Parameter Name Parameter Description Value Default Access Level Enable BCD enable Conf Modbus address Input1 Src-LSB...

  • Page 214: Input Operators Wiring Examples

    Engineering Handbook 2704 Controller 14.7 INPUT OPERATORS WIRING EXAMPLES 14.7.1 Switch Over Loop With Custom Linearised Input Loop 1 PV Src Cust Lin 1 Ctrl Hold Src Mod 3 A Mod 1 A Integr Hld Src Input Src Mod3A.Va Man Mode Src...

  • Page 215: Configuring The Bcd Input To Select A Program

    2704 Controller Engineering Handbook 14.7.2 Configuring the BCD Input to Select a Program BCD Function Block Input1 Src BCD Value Input2 Src Decade Decimal Value Input 3 Src Input4 Src Digit 1(units) Input5 Src Input6 Src Digit 2(units) Decade Input7 Src...

  • Page 216: Holdback Duration Timer

    Holdback Duration Timer This procedure describes how to configure a 2704 controller, using the Monitor Block, to accumulate the total time that a program has been in holdback within a segment. A holdback timer can be used to inform the user his application is taking longer to heat up than normal, possibly indicating a problem with the heat source or unusually high losses.

  • Page 217: Chapter 15 Timer, Clock, Totaliser, Operation

    The Timer Blocks page is only available if Timer Blocks has been enabled in configuration level. The Timer Blocks fitted in the 2704 controller...

  • Page 218: Timer Types

    Engineering Handbook 2704 Controller 15.2 TIMER TYPES Each timer block can be configured to operate in four different modes. These modes are explained below 15.2.1 On Pulse Timer Mode This timer is used to generate a fixed length pulse from an edge trigger.

  • Page 219: Off Delay Timer Mode

    2704 Controller Engineering Handbook 15.2.2 Off Delay Timer Mode This timer provides a delay between the trigger event and the Timer output. If a short pulse triggers the Timer, then a pulse of one sample time (110ms) will be generated after the delay time.

  • Page 220: One Shot Timer Mode

    Engineering Handbook 2704 Controller 15.2.3 One Shot Timer Mode This timer behaves like a simple oven timer. • When the Time is edited to a non-zero value the Output is set to On • The Time value is decremented until it reaches zero. The Output is then cleared to Off •...

  • Page 221: Compressor Or Minimum On Timer Mode

    2704 Controller Engineering Handbook 15.2.4 Compressor or Minimum On Timer Mode This timer has been targeted at guaranteeing that the output remains On for a duration after the input signal has been removed. It may also be known as an ‘Off Delay’ timer and may be used, for example, to ensure that a compressor is not cycled excessively.

  • Page 222: To View And Adjust Timer Parameters

    Engineering Handbook 2704 Controller 15.3 TO VIEW AND ADJUST TIMER PARAMETERS Do This This Is The Display You Should See Additional Notes This page is only available if ‘Timer 1. From any display press Blocks is Enabled in the many times as necessary to access...

  • Page 223: The Clock

    2704 Controller Engineering Handbook 15.4 THE CLOCK A real time clock is provided for use with various timer functions in the controller. 15.4.1 Clock Parameters Table Number: This page allows you to configure the clock TIMER BLOCKS (Clock Page) 15.4.1.

  • Page 224: Time Based Alarms

    Engineering Handbook 2704 Controller 15.5 TIME BASED ALARMS There are two alarms available which allow an output to be turned on or off at a set time and day. 15.5.1 Timer Alarm Parameters Table Number: This page allows you to set up Timer Alarm Parameters...

  • Page 225: Totalisers

    2704 Controller Engineering Handbook 15.6 TOTALISERS There are four totaliser function blocks which are used to measure the total quantity of a measurement integrated over time. A totaliser can, by soft wiring, be connected to any measured value. The outputs from the totaliser are its integrated value, and an alarm state.

  • Page 226: Application Example

    Engineering Handbook 2704 Controller 15.7 APPLICATION EXAMPLE 15.7.1 Compressor Timer This example uses the Min-On Timer to start a compressor in an environmental chamber. The compressor must be kept running for 5 to 15 minutes after the controller stops calling for cooling. If the controller starts to call for cooling again the “compressor timeout”...

  • Page 227: Chapter 16 Advanced Functions

    2704 Controller Engineering Handbook CHAPTER 16 ADVANCED FUNCTIONS 16.1 PATTERN GENERATOR The pattern generator allows groups of digital values to be selected from a single input number. This number is displayed as ‘Pattern’ and may be given a name, using the ‘User Text’ feature described in section 7.2.6. This is known as a ‘User Enumeration’.
  • Page 228 Engineering Handbook 2704 Controller 16.1.1.1 To Configure The Pattern Generator Do This This Is The Display You Should See Additional Notes 1. From any display press The PATTERN GEN page is only available if Enabled as described in many times as necessary to access section 7.2.

  • Page 229: Analogue Switches

    2704 Controller Engineering Handbook 16.2 ANALOGUE SWITCHES Analogue Switches allow groups of analogue values to be selected from a single input number. This number may be provided from a user defined analogue source. or, if not wired, the analogue values can be selected from this number.

  • Page 230: User Values

    Each User Value can be given a user defined name using the ‘User Enumeration’ feature. This feature is generally intended for use when the User Value is used in a digital operation. The 2704 controller contains up to 12 user values, which are in a single list under the page header ‘USER VALUES’.

  • Page 231: User Messages

    2704 Controller Engineering Handbook 16.4 USER MESSAGES A User Message takes the form of a pop window which will be displayed in operation level as a result of a particular action occurring. The format of this window is shown below:-...

  • Page 232: User Switches

    Engineering Handbook 2704 Controller 16.5 USER SWITCHES User Switches are similar to User Values when the User Value is used in a digital operation. They may, however, be configured as Auto Resetting or Manual Resetting and typically utilised in ‘User Pages’ (see Chapter 17) to perform a specified task.

  • Page 233: Custom Enumerations

    2704 Controller Engineering Handbook 16.6 CUSTOM ENUMERATIONS ‘Custom Enumerations’ allow a user to enumerate parameter values with their own text. Parameters which support custom enumerations are:- • Program User Values – see section 8.7 • Digital Pattern Generator Inputs – see section 16.1 •...
  • Page 234 Engineering Handbook 2704 Controller 16.6.1.1 User Switch Example This is an example of a parameter which has just two states. User Text 10 Heat Ramp User Text 11 Annealing User Text 12 Cool Ramp User Text 13 Complete Start pointer 15...
  • Page 235 2704 Controller Engineering Handbook 16.6.1.3 Enumerated User Value Example This example enumerates User Value 1 with 1 decimal point resolution. In USER VALUES/User Val 1 page, Set ‘Resolution’ = XXXX.X (section 16.3) Set ‘Low Limit’ = 0.0 (for example) Set ‘High Limit’ = 1.0 (for example) Set ‘User Val Enum’...

  • Page 236: Chapter 17 User

    Engineering Handbook 2704 Controller CHAPTER 17 USER PAGES 17.1 WHAT ARE USER PAGES User pages allow you to place a pre-determined number of parameters onto a set of semi-custom screens. Each of the available screens has a pre-determined structure allowing specific parameter types to be placed directly into empty slots.

  • Page 237: Dual Loop User Page

    2704 Controller Engineering Handbook 17.2.2 Dual Loop User Page Page name can be chosen from user text The position of each Page Name parameter is fixed and dictated by its number XXXXX (indicated next to the Section 1 Name parameter)

  • Page 238: Triple Loop User Page - Style 2

    Engineering Handbook 2704 Controller 17.2.4 Triple Loop User Page – Style 2 Page name can be chosen from user text Section Names are chosen Page Name from user text Section 1 Name Section 2 Name Section 3 Name Bar graph parameters...

  • Page 239: Bar Graph

    2704 Controller Engineering Handbook 17.2.6 Bar Graph Page name can be chosen from user text Page Name The position of each parameter is fixed and dictated by its number (indicated next to the parameter) Bar graph parameters ABC = Parameter name...

  • Page 240: To Configure A User Page

    Engineering Handbook 2704 Controller 17.3 TO CONFIGURE A USER PAGE Configuration of the Parameter List style is identical to that described in section 7.2.7. Configuration of other styles is the same, in principle, for all other pages. The example below configures a Dual Loop style.
  • Page 241 2704 Controller Engineering Handbook Do This This Is The Display You Should See Additional Notes ‘The page name can be chosen from ‘User Text’ (section 7.2.6) 14. Press to select ‘Page Name’ If ‘Default Text’ is chosen the page heading will be ‘User Page 1 (to 8)’...

  • Page 242: To Display The User Page View

    Engineering Handbook 2704 Controller 17.3.1 To Display the User Page View Using the above example, the User Page will be found in both configuration and operator levels in the main menu under its name (Usr1). If the parameter ‘Page Location’ = ‘Loop Summary’ the user page is only available in operator level by pressing the Loop button.

  • Page 243: User Page Parameter Tables

    2704 Controller Engineering Handbook 17.5 USER PAGE PARAMETER TABLES The parameter tables are listed for each type of User Page 17.5.1 Single Loop Table Number: This page allows you to configure a single loop user page USER PAGES 17.5.1. (User Page 1 to 8)

  • Page 244: Dual Loop

    Engineering Handbook 2704 Controller 17.5.2 Dual Loop Table Number: This page allows you to configure a dual loop user page USER PAGES 17.5.2 (User Page 1 to 8) Parameter Parameter Description Value Default Access Name Level Page Location Defines where the page is...

  • Page 245: Triple Loop 1 And 2

    2704 Controller Engineering Handbook 17.5.3 Triple Loop 1 and 2 Table Number: This page allows you to configure a triple loop 1 and 2 user page USER PAGES 17.5.3 (User Page 1 to 8) Parameter Name Parameter Description Value Default...

  • Page 246: Status Grid

    Engineering Handbook 2704 Controller 17.5.4 Status Grid Table Number: This page allows you to configure a status grid user page USER PAGES 15.5.4 (User Page 1 to 8) Parameter Name Parameter Description Value Default Access Level Page Location Defines where the page is...

  • Page 247: Bar Graph

    2704 Controller Engineering Handbook 17.5.5 Bar Graph Table Number: This page allows you to configure a bar graph user page USER PAGES 17.5.5 (User Page 1 to 8) Parameter Name Parameter Description Value Default Access Level Page Location Defines where the page is...

  • Page 248: Parameter List

    Engineering Handbook 2704 Controller 17.5.6 Parameter List Table Number: This page allows you to configure a parameter list user page USER PAGES 17.5.6 (User Page 1 to 8) Parameter Name Parameter Description Value Default Access Level Page Location Defines where the page is...

  • Page 249: Chapter 18 Analogue And Multiple Operators

    2704 Controller Engineering Handbook CHAPTER 18 ANALOGUE AND MULTIPLE OPERATORS 18.1 WHAT ARE ANALOGUE OPERATORS? Analogue Operators allow the controller to perform mathematical operations on two input values. These values can be sourced from any available parameter including Analogue Values, User Values and Digital Values. Each input value can be scaled using a multiplying factor or scalar as shown in Figure 18-1.

  • Page 250: Analogue Operations

    Engineering Handbook 2704 Controller 18.1.1 Analogue Operations The following operations can be performed: The selected analogue operator is turned off The output result is the addition of Input 1 and Input 2 Subtract The output result is the difference Input 1 and Input 2 where Input 1 >...

  • Page 251: To Configure Analogue Operators

    2704 Controller Engineering Handbook 18.2 TO CONFIGURE ANALOGUE OPERATORS Do This This Is The Display You Should See Additional Notes 1. From any display press many times as necessary to access the page header menu 2. Press to select ‘ANALOGUE OPERS’...

  • Page 252: Multiple Operators

    Engineering Handbook 2704 Controller 18.3 MULTIPLE OPERATORS The multiple input operator block performs analogue operations on up to six inputs. It can be used to find the average, maximum value, minimum value or summation of the inputs. The block will output either the operation result (which may be clipped) or a user-defined Default value depending upon the number and status of the wired inputs and whether they are within a user specified range.

  • Page 253: To Enable Multi Operators

    2704 Controller Engineering Handbook 18.4 TO ENABLE MULTI OPERATORS In INSTRUMENT OPTIONS Page, enable ‘An/Logic Opers’. 18.5 TO LOCATE MULTI OPERATOR PARAMETERS Do This This Is The Display You Should See Additional Notes The actual view may vary 1. From any display press...

  • Page 254: 18.5.2 Use Of Default

    Engineering Handbook 2704 Controller These parameters allow you to configure the selected multi operator Press  Table MULTI OPERATOR Number: MultiOp1 (to 3) Page to select each parameter 18.5.1. Parameter Parameter Description Value Default Access Level Name In3 Val Value of input 3...

  • Page 255: Chapter 19 Logic Operators

    2704 Controller Engineering Handbook CHAPTER 19 LOGIC OPERATORS Logic Operators allow the controller to perform logical calculations on two input values. These values can be sourced from any available parameter including Analogue Values, User Values and Digital Values. The parameters to use, the type of calculation to be performed, input value inversion and ‘fallback’ value are determined in Configuration level.

  • Page 256: To Configure Logic Operators

    Engineering Handbook 2704 Controller 19.2 TO CONFIGURE LOGIC OPERATORS Do This This Is The Display You Should See Additional Notes 1. From any display press many times as necessary to access the page header menu 2. Press to select ‘LOGIC OPERS’...

  • Page 257: Patch Wiring

    2704 Controller Engineering Handbook 19.3 PATCH WIRING Patch wiring consists of blocks that allow the user to wire from any parameter to another. Each block consists of a ‘Source’, ‘Destination’ and ‘Status’ element. Each wire status indicates the success / failure of the connection (successful writing of the value or not –...

  • Page 258: Chapter 20 Digital Communications

    Engineering Handbook 2704 Controller CHAPTER 20 DIGITAL COMMUNICATIONS 20.1 WHAT IS DIGITAL COMMUNICATIONS? Digital Communications (or ‘comms’ for short) allows the controller to communicate with a PC or a networked computer system. A choice of comms protocol is available and can be selected in configuration level. For standard serial comms, the protocols are MODBUS (or JBUS), or EIBisynch, and modules can be fitted in both the H or J slots.

  • Page 259: To Configure Communications Parameters

    2704 Controller Engineering Handbook 20.2 TO CONFIGURE COMMUNICATIONS PARAMETERS The operation of the H and J Modules is the same. Do This This Is The Display You Should See Additional Notes 1. From any display press many times as necessary to access the page header menu 2.

  • Page 260: 20.2.2 J Module Parameters

    Engineering Handbook 2704 Controller 20.2.1.1 Ethernet Parameters Table Number: These parameters are displayed if Protocol = Ethernet COMMS 20.2.1.1. (H Module Page) Parameter Name Parameter Description Value Default Access Level Ethernet Protocol Comms protocol 1 - 253 Address Controller address...

  • Page 261: Digital Communications Diagnostics

    2704 Controller Engineering Handbook 20.3 DIGITAL COMMUNICATIONS DIAGNOSTICS Digital communications diagnostics is available under the Comms page menu. Two parameters are displayed. The H Rx and J Rx messages increments each time a valid message is received via the H Comms Module or J Comms module respectively.

  • Page 262: Ethernet Technical Note

    "aa-bb-cc-dd-ee-ff". In the 2704 instrument MAC addresses are shown as 3 separate values in the "COMMS" page, each representing 2 pairs of MAC address digits. The first (MAC1) shows the first two pairs of digits (example "AA- BB"), MAC2 shows to the third and fourth pair of MAC digits and MAC3 shows the fifth and sixth pairs of MAC...

  • Page 263: Itools Setup

    2704 Controller Engineering Handbook 20.4.8 iTools Setup iTools configuration package, version V5.64 or later, may be used to configure Ethernet communications. The following instructions configure Ethernet. To include a Host Name/Address within the iTools scan:- Ensure iTools is NOT running before taking the following steps Within Windows, click ‘Start’, the ‘Settings’, then ‘Control Panel’...

  • Page 264: Addendum:- 2704 Controller Specials Number Eu0678

    ADDENDUM:- 2704 CONTROLLER SPECIALS NUMBER EU0678 APPLIES TO 2704 CONTROLLER FITTED WITH ETHERNET COMMUNICATIONS . A parameter has been added to 2704 controllers fitted with Ethernet Communications. The parameter is ‘Unit Ident’ and appears in the Ethernet Parameters List in the table below.

  • Page 265: Chapter 21 2704 Master Communications

    Broadcast Communications The 2704 master can be connected to up to 32 slaves. The master sends a unit address of 0 followed by the address of the parameter which is to be sent. A typical example might be a multi zone oven where the setpoint of each zone is required to follow, with digital accuracy, the setpoint of a master.

  • Page 266: Wiring Connections

    Engineering Handbook 2704 Controller 21.2 WIRING CONNECTIONS Before proceeding further, please read Appendix B, Safety and EMC information, in the above handbooks. The Digital Communications module for the master is fitted in Communications Module slot J and uses terminals JA to JF.

  • Page 267: Example Wiring Diagrams For Different Slaves

    2704 Controller Engineering Handbook 21.2.1 Example Wiring Diagrams for Different Slaves The following diagrams show connections for a range of different controllers using EIA422. These are representative of typical slaves which may be used but could also include third party products using Modbus protocol.
  • Page 268 Engineering Handbook 2704 Controller EIA485 2-wire Slave Terminal Numbers 2704 Terminal Function 2200 2400 2600 2700 Master 220 ohm termination resistors across the Rx Comms cable should be ‘daisy chained’ as shown terminals of the master from one instrument to the next and not connected from a ‘star’...

  • Page 269: Cross-Board Version

    2704 Controller Engineering Handbook 21.3 CROSS-BOARD VERSION If master communications is fitted as an upgrade, check also the cross-board version before configuring master comms. This parameter can be found in configuration level in ‘INSTRUMENT (Info Page) ‘CBC Version’ and must be greater than 4.7 (displayed as 47).

  • Page 270: To Configure Parameters

    COMMS Parameters transaction between a local 8. Press to scroll around Slave 1 MASTER COMMS parameter in the 2704 and a the list and choose ‘Parameters’ STANDARD IO Slave 2 parameter in a slave. Slave 3 MODULE IO Slave 4...

  • Page 271: To Configure Slaves

    2704 Controller Engineering Handbook To Configure Parameters (Continued) Do This This Is The Display You Should See Additional Notes This sets the function to be read or Param. Index 20. Now press to select write. See section 21.7 for full list...

  • Page 272: Parameter Tables

    ‘address’ followed by ‘name of commonly used parameter’ the address in the 2704 in which a parameter sent from a slave is stored. Slave Address The address of the slave where the parameter 0 to 254 is to be sent or received.
  • Page 273 2704 Controller Engineering Handbook Table Number: These parameters configure the characteristics of the slaves MASTER COMMS 21-7b (Slave1 to 8 Page) Parameter Name Parameter Description Value Default Access Level 0 to 254 Address The modbus address of the slave Resolution...

  • Page 274: Additional Notes

    Engineering Handbook 2704 Controller 21.8 ADDITIONAL NOTES 21.8.1 IEEE in 2000 Series This section applies specifically to 2000 series instruments. If the slave is not a series 2000 instrument, a knowledge of the communications format for the slave is required.

  • Page 275: Chapter 22 Standard Io

    2704 Controller Engineering Handbook CHAPTER 22 STANDARD IO 22.1 WHAT IS STANDARD IO? Standard IO refers to the fixed Input/Output connections as listed in Table 22-1 below. Parameters such as input/output limits, filter times and scaling of the IO can be adjusted in the Standard IO pages.

  • Page 276: Offset

    Engineering Handbook 2704 Controller 22.2.2 Offset Offset has the effect of moving the whole curve, shown in Figure 22-1, up or down about a central point. The ‘Offset’ parameter is found in the STANDARD IO (PV Input) page as shown in the controller view in Section 22.2.4.

  • Page 277: To View And Change Input Filter Time

    2704 Controller Engineering Handbook 22.2.3 To View and Change Input Filter Time An input filter provides damping of the input signal. This may be necessary to prevent the effects of excessive noise on the PV input. The filter may be turned off or set in steps of 0.1sec up to 10mins If the input is configured to accept process levels, eg 4-20mA, as in the above example, the parameter which follows ‘Eng Value Hi’...
  • Page 278 Engineering Handbook 2704 Controller PV Input Table Number: This page allows you to configure the PV Input Parameters STANDARD IO ( Page) 22.2.4. Parameter Name Parameter Description Value Default Access Level Electrical Val The current electrical Input range R/O L1...

  • Page 279: Analogue Input

    2704 Controller Engineering Handbook 22.3 ANALOGUE INPUT Allows access to parameters which set up the fixed Analogue Input connected to terminals BA, BB and BC. This is the high level input from a remote source. 22.3.1 To Scale the Analogue Input The procedure is the same as that described in section 22.2.1.

  • Page 280: Sensor Break Value

    Engineering Handbook 2704 Controller 22.3.3 Sensor Break Value The controller continuously monitors the impedance of a transducer or sensor connected to any analogue input (including plug in modules described in the following chapter). This impedance, expressed as a percentage of the impedance which causes the sensor break flag to trip, is a parameter called ‘SBrk Trip Imp’...
  • Page 281 2704 Controller Engineering Handbook To set up and scale the Fixed Relay Output proceed as follows: (This can be done in Level 3) Do This This Is The Display You Should See Additional Notes From any display press as many...

  • Page 282: The Fixed Relay Output Parameters

    Engineering Handbook 2704 Controller 22.5 THE FIXED RELAY OUTPUT PARAMETERS These parameters configure the fixed relay output connected to terminals AA, AB and AC. This relay may be used as an alarm, time proportioning or On/Off control output. AA Relay 22.5.1...

  • Page 283: Standard Io Dig I/Oparameters

    2704 Controller Engineering Handbook 22.6 STANDARD IO DIG I/OPARAMETERS This page allows access to parameters which set up the fixed digital IO connected to terminals D1 to D7 and The standard digital IO1 to 7 can either be input or output and is set up in configuration level. The choices are:- 1.
  • Page 284 Engineering Handbook 2704 Controller Note 1: Only settings between 0 & 100 are valid for Dig IO-Val. The corresponding Electrical value is shown in the following table:- Channel Type Dig IO- Val Electrical Value On/Off 0 to 100 0 to 1...

  • Page 285: Standard Io Diagnostic Parameters

    2704 Controller Engineering Handbook 22.7 STANDARD IO DIAGNOSTIC PARAMETERS This page allows you to configure a name for the digital input and to inspect its status or that of the IO Expander if fitted. The parameters are shown in the following table.

  • Page 286: Chapter 23 Module Io

    Transducer PSU AH026306U002 supply Potentiometer input Pot Input AH025864U002 Analogue input module DC Input AH025686U004 (2604/2704 dc Input) Dual PV input Dual PV In AH026359U003 (Dual Probe Input) Isolated single logic output Sin-Logic OP AH025735U002 Dual DC output Dual DC Out...

  • Page 287: Module Identification

    2704 Controller Engineering Handbook 23.2 MODULE IDENTIFICATION To identify which module is fitted into which slot:- Do This This Is The Display You Should See Additional Notes 1. From any display press as many times as necessary to access the page header menu 2.

  • Page 288: Module Io Parameters

    Engineering Handbook 2704 Controller 23.3 MODULE IO PARAMETERS Each module has a unique set of parameters which depend on the function of the module fitted. To view and alter parameters associated with each module:- Do This This Is The Display You Should See...

  • Page 289: Relay Output

    2704 Controller Engineering Handbook 23.3.2 Relay Output This page allows you to configure a Relay Output module. Table Number: MODULE IO (Module Types included:- (A) Page) 23.3.2. Form C Relay; Form A Relay; Dual Relay. Parameter Parameter Description Value Default...

  • Page 290: Triac Output

    Engineering Handbook 2704 Controller 23.3.3 Triac Output Table Number: This page allows you to configure a Triac Output module. MODULE IO (Module (A) Page) 23.3.3. Types included:- Triac; Dual Triac Parameter Name Parameter Description Value Default Access Level Ident Module identification...

  • Page 291: Triple Logic Output And Single Isolated Logic Output

    2704 Controller Engineering Handbook 23.3.4 Triple Logic Output and Single Isolated Logic Output Table Number: This page allows you to configure a Logic Output module. MODULE IO (Module (A) Page) 23.3.4. Parameter Name Parameter Description Value Default Access Level Logic Output...

  • Page 292: Triple Logic And Triple Contact Input

    Engineering Handbook 2704 Controller 23.3.5 Triple Logic and Triple Contact Input Table Number: This page allows you to set the parameters for a Triple Logic Input MODULE IO (Module module. Page) 23.3.5. Parameter Name Parameter Description Value Default Access Level...

  • Page 293: Potentiometer Input

    2704 Controller Engineering Handbook 23.3.8 Potentiometer Input Table Number: This page allows you to set the parameters for a Potentiometer Input MODULE IO (Module module. Page) 23.3.8. Parameter Name Parameter Description Value Default Access Level Ident Pot Input Units Engineering units.
  • Page 294 Engineering Handbook 2704 Controller 3 or Table Number: This page allows you to set the parameters for a PV Input module. MODULE IO (Module (A) Page) 23.3.9. This module can only be fitted in slots 3 or 6. Parameter Name...

  • Page 295: 23.3.10 Dc Input

    2704 Controller Engineering Handbook 23.3.10 DC Input Table Number: This page allows you to set the parameters for a DC Input module. MODULE IO (Module (A) Page) 23.3.10. This module can only be fitted in slots 1, 3, 4 or 6.

  • Page 296: 23.3.11 Dual Pv Input

    Engineering Handbook 2704 Controller 23.3.11 Dual PV Input The dual PV input module accepts two inputs - one from a high level source (channel A) and one from a low level source (channel C). The two inputs are not isolated from each other and have an update rate of 5Hz. One application for the module is for a zirconia probe input.
  • Page 297 2704 Controller Engineering Handbook Table Number: This page allows you to set the parameters for Channel C of a Dual PV MODULE IO (Module Input module. (C) Page) 23.3.11c. This module can only be fitted in slots 3 or 6.

  • Page 298: 23.3.12 4-Wire Rtd Input

    Engineering Handbook 2704 Controller 23.3.12 4-Wire RTD Input Two special input modules for PRT type sensors are available that can satisfy basic requirements of metrology applications in terms of stability and resolution. Module code PH is optimised to work with Pt100 and module code PL is optimised to work with Pt25.5.

  • Page 299: 23.3.13 Dual Dc Output

    2704 Controller Engineering Handbook 23.3.13 Dual DC Output This module (order code DO) can be fitted in slots 4, 5 and 6 with a maximum of three in any single controller. It contains two output channels. Each channel can be either 4-20mA control output, with 12 bit resolution, or a 24Vdc (20 to 30Vdc) transmitter supply.

  • Page 300: 23.3.14 Dual Dc Output Module Io Parameters

    Engineering Handbook 2704 Controller 23.3.14 Dual DC Output Module IO Parameters Table Number: This page allows you to set the parameters for a Dual DC Output module. MODULE IO (Module (C) Page) 23.3.14. This module can only be fitted in slots 1, 4, and 5.

  • Page 301: 23.3.15 High Resolution Retransmission Output

    2704 Controller Engineering Handbook 23.3.15 High Resolution Retransmission Output This module (order code HR) can be fitted in slots 1, 4, and 5 with a maximum of three in any single controller. It contains two output channels. The first channel provides a high resolution, 15 bit, 4-20mA or 0-10Vdc retransmission signal.
  • Page 302 Engineering Handbook 2704 Controller Precise 4-20mA Current Loop Retransmission (14bit) Using Dual (probe) module and a feedback loop with input from cannel A Burden resistor 2.49Ω to 900Ω 0.1% Retransmission Variable Txdcr 0-100% HiRes Output Scaling 4-20mA block PID Loop...
  • Page 303 2704 Controller Engineering Handbook Precise 0-10V Voltage Retransmission (15bit) Using a single precision PV input, PSU output and a feedback loop HiRes Output Ch A 4-20mA Retransmission Variable 0-100% Ch C Txdcr Burden resistor Scaling Panel 5.6KΩ 750Ω 0.1% 0.2W...
  • Page 304 Engineering Handbook 2704 Controller Precise 0-10V Voltage Retransmission (14bit) Using a Dual (probe) input, PSU output and a feedback loop with input from channel A. HiRes Output Retransmission Variable Ch A 4-20mA 0-100% Txdcr Ch C Burden resistor Scaling Panel 5.6KΩ...

  • Page 305: 23.3.16 High Resolution Output Module Parameters

    2704 Controller Engineering Handbook 23.3.16 High Resolution Output Module Parameters Table Number: This page allows you to set the parameters for a High Resolution Output MODULE IO (Module module. (C) Page) 23.3.16. This module can only be fitted in slots 1, 4 and 5.

  • Page 306: Tds Input Module

    Engineering Handbook 2704 Controller 23.4 TDS INPUT MODULE The TDS module is specific to TDS measurement and provides a hardware interface with a TDS probe. It can be fitted into any module slot except slot 2. A 1KHz ac signal is produced at terminal A with respect to terminal D as earth.

  • Page 307: Cable Offset

    2704 Controller Engineering Handbook 23.4.2 Cable Offset Cable offset is used to compensate for cable conductance of the installation. It is only important if the desired range of measurements extends to a conductance of less than five times the conductance of the cable.

  • Page 308: Module Scaling

    Engineering Handbook 2704 Controller 23.5 MODULE SCALING The IO modules are scaled as already described in Chapter 23 for the fixed inputs and outputs. The procedures are repeated below:- 23.5.1 The PV Input Scaling of the PV input applies to linear process inputs, eg linearised transducers, where it is necessary to match the displayed reading to the electrical input levels from the transducer.

  • Page 309: To Scale The Pv Input

    2704 Controller Engineering Handbook 23.5.2 To Scale The PV Input:- Do This This Is The Display You Should See Additional Notes 1. From any display press many times as necessary to access the page header menu 2. Press to select ‘Module IO’...

  • Page 310: Output Modules

    Engineering Handbook 2704 Controller 23.5.3 Output modules If the output module is DC or if it is a relay, triac or logic used as time proportioning control, it can be scaled such that a lower and upper level of PID demand signal can limit the operation of the output value. This is shown in Figure 23-9 applied to a relay output or any time proportioning output..

  • Page 311: To Scale A Control Output

    2704 Controller Engineering Handbook 23.5.4 To Scale A Control Output:- Do This This Is The Display You Should See Additional Notes 1. From the MODULE IO sub-header display, Press to choose the slot in which the Output module is fitted 2.

  • Page 312: Retransmission Output

    Engineering Handbook 2704 Controller 23.5.5 Retransmission Output The retransmission output can be scaled so that the output value corresponds to range of the signal to be retransmitted. Figure 23-10 shows an example where the retransmitted signal is PV or SP and an electrical output of 4-20mA represents 20.0 to 200.0 units.

  • Page 313: To Scale The Potentiometer Input

    2704 Controller Engineering Handbook 23.5.6 To Scale the Potentiometer input When using the controller in bounded valve position control mode, it is necessary to calibrate the feedback potentiometer to correctly read the position of the valve. The value of the potentiometer input is read by the parameter ‘Module xA Val’, where x is the number of the slot in which the Pot Input module is fitted.
  • Page 314 Engineering Handbook 2704 Controller Calibrate the Potentiometer Maximum Position Repeat the above steps to adjust the valve fully open and select the parameter ‘Pot Hi Pos’ The Potentiometer Input Module can be used simply so that the resistance value represents an engineering value.

  • Page 315: Module Io Wiring Examples

    2704 Controller Engineering Handbook 23.6 MODULE IO WIRING EXAMPLES 23.6.1 To Configure Module 1 Channel A to Run a Program Mod 1A Programmer Mod1A. Val Run Src Figure 23-11: External Run/Hold Switch This example assumes a Triple Logic module fitted in module slot 1. No configuration of the Module 1A function block is required but the output of the block must be wired to the Run Source in the Programmer block.

  • Page 316: Zirconia Probe Impedance Measurement

    23.6.3 Zirconia Probe Impedance Measurement The impedance of Zirconia probes can increase with age. The 2704 controller can be used to monitor this impedance using the ‘Sensor Break Value’ parameter. An alarm on this parameter can be provided if required.
  • Page 317 2704 Controller Engineering Handbook 23.6.3.1 Implementation This example assumes the Zirconia inputs is connected to the Dual PV Input module, Mod 3. Analogue Operator 2 acts as a scalar to convert % to a calibrated value of impedance. User Value 1 is used as a convenient way to calibrate the sensor break value against a known resistor.

  • Page 318: Chapter 24 Transducer Scaling

    3, 4, 5, or 6. In practice, however, it is unlikely that transducer scaling would be required on every input and so the 2704 controller includes three transducer calibration function blocks. These can be wired in configuration level to any three of the above inputs.

  • Page 319: 24.2.1 To Calibrate A Strain Gauge Bridge Transducer

    2704 Controller Engineering Handbook 24.2.1 To Calibrate a Strain Gauge Bridge Transducer The controller must have been configured for Cal Type = Shunt, and the transducer connected as shown in, Figure 2-18 using the ‘Transducer Power Supply’. Then:- Do This...
  • Page 320 Engineering Handbook 2704 Controller ☺ Tip: To backscroll hold down and press The controller automatically performs the procedure described in Section 24.2. During this time the Cal Active parameter will change to On. When this parameter value changes back to Off the calibration is complete.

  • Page 321: Load Cell Calibration

    2704 Controller Engineering Handbook 24.3 LOAD CELL CALIBRATION A load cell with V, mV or mA output may be connected to the PV Input, Analogue Input or Modules 1, 3, 4, 5, 6 supplied as analogue inputs. The wiring connections are shown in Chapter 2 ‘INSTALLATION’.

  • Page 322: Comparison Calibration

    Engineering Handbook 2704 Controller 24.4 COMPARISON CALIBRATION Comparison calibration is most appropriate when calibrating the controller against a second reference instrument. In this case the process calibration points are not entered ahead of performing the calibration. The input may be set to any value and, when the system is stable, a reading is taken from the reference measurement device and entered into the controller.

  • Page 323: To Calibrate A Controller Against A Second Reference

    2704 Controller Engineering Handbook 24.4.1 To Calibrate a Controller Against a Second Reference The controller must have been configured for Cal Type = Comparison, and the transducer connected as shown in the User Guide Chapter 2. Then:- Do This This Is The Display You Should See Additional Notes Enable calibration as described in steps 1-7 of section 24.2.1.

  • Page 324: Auto-Tare Calibration

    Engineering Handbook 2704 Controller 24.5 AUTO-TARE CALIBRATION The auto-tare function is used, for example, when it is required to weigh the contents of a container but not the container itself. The procedure is to place the empty container on the weigh bridge and ‘zero’ the controller. Since it is likely that following containers may have different tare weights the auto-tare feature is always available in the controller at access level 1.
  • Page 325 2704 Controller Engineering Handbook The effect of auto-tare is to introduce a DC bias to the measurement, as shown in Figure 24-4 below. New Scale High Tare offset Scale High New Scaling Tare value Original Scaling Tare offset PV at tare point...

  • Page 326: Transducer Scaling Parameters

    Engineering Handbook 2704 Controller 24.6 TRANSDUCER SCALING PARAMETERS The parameters listed in the table below allow you to soft wire to sources within the controller to provide, for example, operation of calibration procedure via external switches. 24.6.1 Transducer Scaling Parameter Table...

  • Page 327: Parameter Notes

    2704 Controller Engineering Handbook 24.6.2 Parameter Notes This may be wired to a digital input for an external switch. If not wired, then the value 1. Enable Cal may be changed. When enabled the transducer parameters may be altered as described in the previous sections.

  • Page 328: Chapter 25 Io Expander

    25.1 WHAT IS IO EXPANDER? The IO Expander is an external unit which can be used in conjunction with the 2704 controller to allow the number of digital IO points to be increased. There are two versions:- 1. 10 Inputs and 10 Outputs 2.

  • Page 329: To Configure Io Expander

    2704 Controller Engineering Handbook 25.2 TO CONFIGURE IO EXPANDER Do This This Is The Display You Should See Additional Notes 1. From any display press as many times as necessary to access the page header menu 2. Press to select ‘IO...

  • Page 330: Chapter 26 Diagnostics

    Engineering Handbook 2704 Controller CHAPTER 26 DIAGNOSTICS 26.1 WHAT IS DIAGNOSTICS? Diagnostics are displayed in Access Level 3 and Configuration level, and provide information on the internal state of the controller. The parameters are intended for use in advanced fault finding situations. Up to eight error messages can be listed and each error message displays a message showing the state of the controller.
  • Page 331 2704 Controller Engineering Handbook Note 1. Possible error messages:- SPI Locked Bad Ident SPI Queue Full Bad Fact Cal HighP Lockout Module Changed Pro Mem Full DFC1 Error, DFC2 Error, DFC3 Error Invalid Seg Module N/A Program Full CBC Comms Error...

  • Page 332: Chapter 27 Calibration

    2704 Controller CHAPTER 27 CALIBRATION The 2704 controller is calibrated in three ways. These are:- 1. Factory Calibration. The controller is calibrated to very high accuracy during manufacture and the calibration values are permanently stored within the controller. Factory calibration is not available to the user, but it is always possible to revert to the factory values if required.

  • Page 333: Pv Input

    2704 Controller Engineering Handbook 27.3 PV INPUT 27.3.1 To Calibrate mV Range Calibration of both 40 and 80 mV ranges for the PV Input is carried out using the same 50 milli-volt source. Pyrometer and mA calibration is included in this procedure. To calibrate thermocouples it is first necessary to calibrate the 40mV and 80mV ranges followed by CJC described in section 27.3.2.
  • Page 334 Engineering Handbook 2704 Controller Do This This Is The Display You Should See Additional Notes Calibrate at 0mV 7. Set mV source to 0mV (or better by linking the two copper wires as described in the previous section) 3sec Calibration commences 3 Press to choose ‘Low - 0mV’...

  • Page 335: Thermocouple Calibration

    2704 Controller Engineering Handbook 27.3.2 Thermocouple Calibration Thermocouples are calibrated, firstly, by following the previous procedure for the 40mV and 80mV ranges, (both ranges should be calibrated to cover all types of thermocouple) then calibrating CJC. This can be carried out using an external CJC reference source such as an ice bath or using a thermocouple mV source.

  • Page 336: 3-Wire Rtd Calibration

    Engineering Handbook 2704 Controller 27.3.5 3-Wire RTD Calibration The two points at which RTD is calibrated are 150.00Ω and 400.00Ω. Before starting RTD calibration: • A decade box with total resistance lower than 1K must be connected in place of RTD as indicated on the connection diagram before the instrument is powered up.

  • Page 337: Analogue Input

    2704 Controller Engineering Handbook 27.4 ANALOGUE INPUT Calibration of the Analogue input is carried out using an 8 volt (+2mV) source. mA calibration is included in Volt calibration and assumes 100Ω burden resistor across terminals BA & BB. There are three conditions to be calibrated - Offset, Common Mode Rejection and Gain.

  • Page 338: Module I/O

    Engineering Handbook 2704 Controller 27.5 MODULE I/O 27.5.1 DC Output Module The DC output module is calibrated in the factory at 10% and 90% of output level. This is 1 and 9V for 0 to 10Vdc output; 2mA and 18mA for a 0 to 20mA output; 4mA and 18mA for A dual DC output.
  • Page 339 2704 Controller Engineering Handbook Do This This Is The Display You Should See Additional Notes Now Calibrate at 10% Output 3 seconds after selecting ‘Cal Low’ 3 Sec Press to choose ‘Cal Low’ vCal Low Cal State the confirm message will appear.

  • Page 340: Pv Input Module

    Engineering Handbook 2704 Controller 27.5.2 PV Input Module PV Input modules can be fitted in positions 3 and 6. These modules can provide inputs for thermocouple, 3- wire RTD, mV, Volts or mA. The wiring connections for these inputs are shown below.

  • Page 341: Tds Input Module - Conductance Calibration

    2704 Controller Engineering Handbook 27.5.5 TDS Input Module – Conductance Calibration Since the module is factory calibrated it is very unlikely that it will be necessary to recalibrate the conductance reading in the field. However, should this become necessary the procedure in this section should be followed.

  • Page 342: 4-Wire Rtd Module Calibration

    10ppm accuracy. If absolute accuracy is required and the appropriate 4-wire resistance source is not available the user is advised to return the controller to Eurotherm for calibration. Each module is calibrated at two points, that is, ‘Low Calibration’ at 0Ω, which effectively is the mV offset calibration for the input, and ‘High Calibration’...
  • Page 343 2704 Controller Engineering Handbook Re-connect the ‘A’ terminal wire as shown in Figure 27-8 and allow at least 4 minutes for the instrument to stabilise. Refer to section 27.5.6.4. 3A or 6A 4-wire Resistance Reference 3B or 6B 2704 Controller 200Ω...

  • Page 344: To Restore Factory Calibration Values

    (B & C) cable connections – see Figure below. The 2704 rear terminal connector is made of beryllium-copper alloy which minimizes thermally induced e.m.f. at the instrument end. The user must ensure that any non-copper connections between the RTD and the instrument are either eliminated or the temperature gradients along both the inner connections are identical.

  • Page 345: Chapter 28 Boiler Control

    Engineering Handbook CHAPTER 28 BOILER CONTROL The 2704 contains function blocks and hardware that are primarily designed for use in controlling water impurities in shell type industrial Boilers. Other aspects of Boiler Control such as level and pressure control can be set up using standard PID blocks and this is covered in other chapters.

  • Page 346: How Is Tds Measured

    As the fluid under test may not be at 25°C, particularly boiler fluid, the conductance reading will have to be temperature compensated to hold relationship to TDS. In the 2704 controller this is usually automatically done by sensing liquid temperature and applying an appropriate correction factor to each reading of conductance. In cases where the temperature sensing is not available the user must estimate this temperature (derived from boiler pressure –...

  • Page 347: Probe Factor (K)

    The conductance is, therefore, measured between the centre electrode and the probe casing or the boiler’s body shell. The 2704 TDS Module delivers a 1Khz alternating signal of ~0.4Vpp (peak to peak amplitude) from the driver terminal A. The driver sense terminal B and ground sense terminal C measures the return voltage and automatically compensates for cable resistance by adjusting the driver voltage to obtain 0.4Vpp at the probe.

  • Page 348: Driver O/P

    Engineering Handbook 2704 Controller 28.3.6 Driver O/P The level of the driver signal (i.e. the ac voltage between terminals A and D) is monitored by the controller and displayed as a % of the maximum possible signal, ~ 5Vpp. In order to retain 0.4Vpp at the probe, the driver signal will always be sufficiently greater than this to compensate for the voltage drop along the wires and the losses in the probe itself.

  • Page 349: Tds Function Block

    2704 Controller Engineering Handbook 28.4 TDS FUNCTION BLOCK All the factors influencing derivation of the TDS PV described in section 28.3are taken into account and incorporated into TDS Function Block. The TDS Function Block takes the ‘Conductance’ reading from TDS Input Module as well as a temperature from another input and performs certain calculations to derive a TDS value.

  • Page 350: Tds Function Block Parameters

    Engineering Handbook 2704 Controller 28.4.3 TDS Function Block Parameters The TDS Function block has input and output parameters as well as key internal variables as shown in the table shown below. Table This list allows you to set up the parameters for boiler...
  • Page 351 2704 Controller Engineering Handbook Table This list allows you to set up the parameters for boiler BOILER (TDS) Number: control 28.4.3. Parameter Parameter Description Value Default Access Level Name Confirm This parameter is used when the settings of Change ‘K-Factor’ and ‘Temp Coef’ are changed and conflict with the TDScal.

  • Page 352: Further Parameter Descriptions

    Engineering Handbook 2704 Controller 28.4.4 Further Parameter Descriptions 28.4.4.1 TDS Status Values Enumeration Display Description No temp This status indicates that the temperature input is required but is not valid, therefore the temperature compensated outputs are invalid. Confirm This status indicates that there has been a manual change to either ‘K’ or ‘TCOEF’ that...
  • Page 353 2704 Controller Engineering Handbook 28.4.4.3 ‘Set-up’ Parameter The TDS Function block is required to complete its installation set-up and calibration while the system is running (not in Conf. access level). It is therefore necessary to make certain parameters available at access level 3 while the installation and calibration are being completed.
  • Page 354 Engineering Handbook 2704 Controller ProbeCal The ‘ProbeCal’ is periodic calibration that will involve the user directly measuring the conductance of the boiler water through titration. This value (usually measured using calibrated reference conductance meter) is then entered into the instrument. The value must be entered in the same units as the units set for the TDS PV ( PPM or μS/cm@25...
  • Page 355 2704 Controller Engineering Handbook 28.4.4.5 TDS Calibration using Cal State Parameter The Cal state parameter is used to control a calibration state machine that deals with all three calibration mechanisms. The options that are available to the user in any access level other than Conf. are dependent on the setting of the ‘Setup’...
  • Page 356 Engineering Handbook 2704 Controller NOTES: * = State will change to ‘Confirm’ once the user has entered the data representing the manually acquired TDS Value (in the correct units) with options for ‘Accept’ and ‘Reject’ as long as the calibration was successful. If the calibration was unsuccessful then the state will change to ‘Failed’...

  • Page 357: Bottom Blowdown Function Block

    2704 Controller Engineering Handbook 28.5 BOTTOM BLOWDOWN FUNCTION BLOCK Traditionally to lower the TDS a boilerman would open a valve in the bottom of the boiler to let water out and lower the TDS. Installing a TDS controller removes the need to do this to lower the TDS value but there is still a need to blowdown the sediment that forms at the bottom of the boiler.

  • Page 358: Operating Principles Of High Integrity Interlock Bus

    Engineering Handbook 2704 Controller 28.5.2 Operating Principles of High Integrity Interlock Bus Interlocking of instruments is shown in Figure 28-4. D* Input Interlock Bus B.B. Inhibit I/P AA Relay B.B. Inhibit O/P Controller 1 Controller 2 B.B. Valve (switch closed =...

  • Page 359: Blowdown Sequence

    2704 Controller Engineering Handbook 28.5.3 Blowdown Sequence When the blowdown time is reached the following sequence takes place:- ‘Bldown State’ will change from ‘BB Wait’ to ‘Check Network’ for only a few seconds. At this point the controller switches the network between high and low states. This is to determine if any other controller is blowing down at the same time a.

  • Page 360: Bottom Blowdown Parameters

    Engineering Handbook 2704 Controller 28.5.6 Bottom Blowdown Parameters Up to three start times cam be set to initiate the blowdown sequence in any boiler. Table Number: This list allows you to set up the parameters for Bottom Blowdown BOILER (Blowdown) 28.5.6.

  • Page 361: Example: To Perform A Boiler Blowdown

    2704 Controller Engineering Handbook Table Number: This list allows you to set up the parameters for Bottom Blowdown BOILER (Blowdown) 28.5.6. Parameter Parameter Description Value Default Access Level Name Alarm Indicates if there is a problem with the network or...

  • Page 362: Appendix A Order Code

    APPENDIX A ORDER CODE 29.1 HARDWARE CODE The 2704 has a modular hardware construction, which accepts up to six plug-in modules and two digital communications modules. Eight digital IO and a relay form part of the fixed hardware build. Controller Type...

  • Page 363: Quick Start Code

    2704 Controller Engineering Handbook 29.2 QUICK START CODE An instrument delivered to the quick start code is partly configured. For simple applications the quick start code may be sufficient to allow the instrument to be used without further configuration. 1 - 3...

  • Page 364: Appendix B Safety And Emc Information

    2704 Controller APPENDIX B SAFETY AND EMC INFORMATION This controller is manufactured in the UK by Eurotherm Controls Ltd. Please read this section carefully before installing the controller This controller is intended for industrial temperature and process control applications when it will meet the requirements of the European Directives on Safety and EMC.

  • Page 365: Installation Safety Requirements

    2704 Controller Engineering Handbook 30.4 INSTALLATION SAFETY REQUIREMENTS 30.4.1 Safety Symbols Various symbols are used on the instrument, they have the following meaning: Caution, (refer to the Functional earth accompanying documents) (ground) terminal This symbol indicates general information. ☺ This symbol indicates a helpful hint.

  • Page 366: Power Isolation

    Engineering Handbook 2704 Controller 30.4.6 Power Isolation The installation must include a power isolating switch or circuit breaker. This device should be in close proximity to the controller, within easy reach of the operator and marked as the disconnecting device for the instrument.

  • Page 367: Appendix C Technical Specification

    2704 Controller Engineering Handbook 30.5.1 Routing of wires To minimise the pick-up of electrical noise, the wiring for low voltage dc and particularly the sensor input wiring should be routed away from high-current power cables. Where it is impractical to do this, use shielded cables with the shield grounded at both ends.

  • Page 368: Dual (Probe) Input Module

    Engineering Handbook 2704 Controller 31.3 DUAL (PROBE) INPUT MODULE General The same specification as for the Precision PV Input module applies with the exception of the following: Module offers two sensor/transmitter inputs, which share the same negative input terminal. One low level (mV, 0-20mA, thermocouple, Pt100) and one high level (0-2Vdc, 0-...

  • Page 369: Standard Digital I/O

    2704 Controller Engineering Handbook 31.6 STANDARD DIGITAL I/O Allocation 1 digital input standard and 7 I/O which can be configured as inputs or outputs plus 1 changeover relay not isolated Digital inputs Voltage level : input active < 2Vdc, inactive >4Vdc Contact closure : input active <100ohms, inactive >28kohms...

  • Page 370: Dual Dc Output

    Engineering Handbook 2704 Controller 31.12 DUAL DC OUTPUT Two Current Outputs 4-20mA, 20V output span (see section 23.3.13) Isolation Fully isolated from the instrument and each other Accuracy 1%, 11 bit noise free resolution Speed 50ms response Can be configured as 20V min at full 22mA current load.

  • Page 371: 4-Wire Rtd Input

    2704 Controller Engineering Handbook 31.16 4-WIRE RTD INPUT PT100 Module PT25 Module Allocation Can be fitted to I/O slots 3 and 6 Isolation Fully isolated from the rest of the instrument Sample rate 9Hz Typical Input filtering OFF to 999.9 seconds of filter t.c. (default f.t.c.= 1.6 sesc.)

  • Page 372: Alarms

    Engineering Handbook 2704 Controller 31.18 ALARMS No of Alarms Input alarms (2), loop alarms (2) User alarms (8) Alarm types Full scale, deviation, rate of change, sensor break plus application specific Modes Latching or non-latching, blocking, time delay Parameters Refer to Chapter 10 31.19 USER MESSAGES...

  • Page 373: Graphical Representation Of Errors

    2704 Controller Engineering Handbook 31.24 GRAPHICAL REPRESENTATION OF ERRORS This section shows graphically the effects of adding all contributions of different errors for each input type and range. The errors are a combination of: Calibration accuracy, Drift with ambient temperature, Linearity error, Leakage 31.24.1 mV Input...

  • Page 374: 31.24.3 High Level Input

    Engineering Handbook 2704 Controller 31.24.3 High Level Input 0 - 10V Input type Range: working range -3V to +10V full linear range - 5V to +14V noise (resolution) 300uV - OFF, 150uV - 0.4sec, 100uV - 1.6sec Calibration accuracy @ 25 | Error | <...

  • Page 375: 31.24.5 Thermocouple Input Type

    2704 Controller Engineering Handbook 31.24.5 Thermocouple Input type Internal CJT sensing spec Calibration error @ 25 C (including temp. difference between top and bottom screws) < + 0.5 Total CJT error < + (0.5 C + 0.012 C per 1 C of ambient change) ( i.e.

  • Page 376: Appendix D Parameter Units And Addresses

    Engineering Handbook 2704 Controller APPENDIX D PARAMETER UNITS AND ADDRESSES 32.1 COMMONLY USED PARAMETERS Although any parameter can be chosen for Soft Wiring, Parameter Promotion or Customised Display purposes, the controller contains those which are most commonly used together with their Modbus Addresses. These...
  • Page 377 2704 Controller Engineering Handbook Parameter Name Parameter Description Refer To Section:- Modbus Address Prg.DO1 Programmer digital OP1 05869 Prg.DO2 Programmer digital OP2 05870 Prg.DO3 Programmer digital OP3 05871 Prg.DO4 Programmer digital OP4 05872 Prg.DO5 Programmer digital OP5 05873 Prg.DO6 Programmer digital OP6 05874 Prg.DO7...
  • Page 378 Engineering Handbook 2704 Controller Parameter Name Parameter Description Refer To Section:- Modbus Address Tmr4.OP Timer 4 output Timer 4 Page 08999 UVal1.Val User 1 value Chapter 16.3 USER VALUES 09220 User Val 1 Page UVal2.Val User 2 value User Val 2 Page 09225 UVal3.Val...

  • Page 379: Parameter Units

    2704 Controller Engineering Handbook Parameter Name Parameter Description Refer To Section:- Modbus Address L1Alm1.OP Loop1 alarm 1 output Chapter 10 ALARMS 11592 LP1 Page L1Alm2.OP Loop1 alarm 2 output LP1 Page 11602 L2Alm1.OP Loop2 alarm 1 output LP2 Page 11640 L2Alm2.OP...
  • Page 380 Engineering Handbook 2704 Controller Declaration of Conformity Part No HA026933 Issue 7.0 Nov-12...
  • Page 382 Invensys Eurotherm Limited pursues a policy of continuous development and product improvement. The specifications in this document may therefore be changed without notice. The information in this document is given in good faith, but is intended for guidance only. Invensys Eurotherm Limited will accept no responsibility for any losses arising from errors in this document.

Table of Contents

Save PDF