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Rockwell Automation Allen-Bradley SLC 500 User Manual

Rockwell Automation Allen-Bradley SLC 500 User Manual

Rtd/resistance input module
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SLC 500
RTD/Resistance
Input Module
1746-NR4
User Manual

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Summary of Contents for Rockwell Automation Allen-Bradley SLC 500

  • Page 1 SLC 500 RTD/Resistance Input Module 1746-NR4 User Manual...

  • Page 2: Important User Information

    Labels may be on or inside the equipment, for example, a drive or BURN HAZARD motor, to alert people that surfaces may be dangerous temperatures. Rockwell Automation, Allen-Bradley, TechConnect, ControlLogix, RSLogix 500, and RSLinx are trademarks of Rockwell Automation, Inc. Trademarks not belonging to Rockwell Automation are property of their respective companies.

  • Page 3: New Information

    Summary of Changes New Information The information below summarizes the changes to this manual since the last revision. The table below lists sections that document new features and additional information about existing features and shows where to find this new information. Change Page Moved terms and abbreviations from...
  • Page 4 Summary of Changes Notes: Publication 1746-UM008B-EN-P - December 2006...

  • Page 5: Table Of Contents

    Table of Contents Preface Use This Manual ........7 Who Should Use This Manual .
  • Page 6 Replacement Parts....... 106 Contact Rockwell Automation ..... . 106...

  • Page 7: Preface

    Preface Use This Manual Read this preface to familiarize yourself with the rest of the manual. This preface covers the following topics: • Who should use this manual • Purpose of this manual • Terms and abbreviations • Conventions used in this manual •...
  • Page 8 Preface Contents of this Manual Chapter Title Contents Preface Describes the purpose, background, and scope of this manual. Also specifies the audience for whom this manual is intended and defines key terms and abbreviations used throughout this book. Overview Provides a hardware and system overview. Explains and illustrates the theory behind the RTD input module.

  • Page 9: Additional Resources

    Preface Additional Resources The following documents contain additional information on Rockwell Automation products. Read This Document Document Number An overview of the SLC 500 family of products SLC 500 Systems Selection Guide 1747-SG001 A description on how to install and use your modular SLC 500 SLC 500 Module Hardware Style User Manual 1747-UM011 programmable controller...
  • Page 10 Preface Notes: Publication 1746-UM008B-EN-P - December 2006...

  • Page 11: Chapter 1 Description

    Chapter Overview This chapter describes the four-channel 1746-NR4 RTD/Resistance Input Module and explains how the SLC controller gathers RTD (Resistance Temperature Detector) temperature or resistance-initiated analog input from the module. Included is: • a general description of the module’s hardware and software features.
  • Page 12 Overview Simplified RTD Module Circuit Constant Current Source C= 0.5 or 2 mA RTD Module RT D Sense RT D Return RT D Sense µP Circuit Digital Data Digital Data RT D Conversion Return RT D Sense RT D Return RT D Sense RT D...

  • Page 13: Rtd Compatibility

    Overview RTD Compatibility The following table lists the RTD types you can use with the RTD module and gives each type’s associated temperature range, resolution, and repeatability specifications. RTD Unit Temperature Ranges, Resolution and Repeatability RTD Unit Type Temperature Range Temperature Range Resolution Repeatability...
  • Page 14 Overview The exact signal range valid for each input type is dependent IMPORTANT upon the excitation current magnitude that you select when configuring the module. For details on excitation current, refer to page 119. This table shows the accuracy and temperature drift. Accuracy and Temperature Drift Specifications RTD Unit Type Accuracy...
  • Page 15 Overview When you are using 100 Ω or 200 Ω platinum RTD units with 0.5 mA excitation current, refer to the following important information about module accuracy. Module accuracy, using 100 Ω or 200 Ω platinum RTD units with 0.5 mA IMPORTANT excitation current, depends on the following criteria: •...

  • Page 16: Resistance Device Compatibility

    Overview Resistance Device Compatibility The following table lists the resistance input types you can use with the RTD module and gives each type’s associated specifications. Resistance Input Specifications Input Type Resistance Range Resistance Range Temperature Resolution Repeatability Accuracy (0.5 mA excitation) (2.0 mA excitation) Drift 150 Δ...

  • Page 17: General Diagnostic Features

    Overview RTD Module Hardware INPUT CHANNEL STATUS MODULE ST ATUS RTD/resistance SHIELD SHIELD CHL 0 RT D CHL 1 RT D CHL 0 SENSE CHL 1 SENSE CHL 0 RETRN CHL 1 RETRN SHIELD SHIELD CHL 2 RT D CHL 3 CHL 2 RT D SENSE...

  • Page 18: System Overview

    Overview System Overview The RTD module communicates to the SLC 500 processor through the parallel backplane interface and receives +5V dc and +24V dc power from the SLC 500 power supply through the backplane. No external power supply is required. You may install as many RTD modules in your system as the power supply can support.
  • Page 19 Overview System Operation The RTD module has three operational states. • Cycle power • Module operation • Error (module error and channel error) Cycle Power When you cycle the module’s power, the RTD module checks its internal circuits, memory, and basic functions via hardware and software diagnostics.
  • Page 20 Overview The A/D convertors cycle between reading the RTD or resistance value, the lead wire resistance, and the excitation current. From these readings, an accurate temperature or resistance is returned to the user program. The RTD module is isolated from the chassis backplane and chassis ground.

  • Page 21: Module To Processor Communication

    Overview The status of each LED indicator, during each of the operational states (for example, powerup, module operation and error), is depicted in the following table. LED Indicator Status LED Indicator Cycle Module Operation Module Error Channel Power (No Error) Error Ch 0 Status Blinks...
  • Page 22 Overview Image Table Input Image Function Output Function Word Image Word Channel 0 data Channel 0 configuration Channel 1 data Channel 1 configuration Channel 2 data Channel 2 configuration Channel 3 data Channel 3 configuration Channel 4 data User-set Lower limit scale 0 Channel 5 data User-set Upper limit scale 0 Channel 6 data...

  • Page 23: Required Tools And Equipment

    Chapter Quick Start Guide This chapter helps you get started using the RTD module. The procedures included here assume that you have a basic understanding of SLC 500 products. You must: • understand electronic process control. • be able to interpret the ladder logic instructions for generating the electronic signals that control your application.

  • Page 24: Procedures

    Quick Start Guide Procedures Follow these procedures to get your RTD module installed and ready to use. Unpack the Module Unpack the module making sure that the contents include: • RTD module, catalog number 1746-NR4. • Installation instructions, publication 1746-IN012. If the contents are incomplete contact your Allen-Bradley representative for assistance.

  • Page 25: Insert The Module

    Quick Start Guide Insert the Module Never install, remove, or wire modules with power applied to ATTENTION the chassis or devices wired to the module. For more information refer to chapter 3, Install and Wire. Make sure system power is off; then insert the RTD module into your 1746 chassis.
  • Page 26 Quick Start Guide RTD Connections to Terminal Block For details on wiring an RTD unit to the module, see chapter 3. Cable Shield Two Wire RTD Interconnection Shield Add jumper. Chl 0 RTD Chl 0 Sense Terminal Pin-outs Return Return Chl 0 Return Shield Belden #9501 Shielded Cable...
  • Page 27 Quick Start Guide Two-wire Potentiometer Connections to Terminal Block For details on wiring an RTD unit to the module, see chapter 3. Cable Shield Potentiometer Add jumper. Shield Chl 0 RTD Chl 0 Sense Return Chl 0 Return Belden #9501 Shielded Cable Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance.
  • Page 28 Quick Start Guide Three-wire Potentiometer Connections to Terminal Block For details on wiring an RTD to the module, see chapter 3. Cable Shield Run RTD unit and sense wires from module to potentiometer terminal and tie them to one point. Shield Potentiometer Chl 0 RTD...
  • Page 29 Quick Start Guide Configure the Module Determine the operating parameters for channel 0. In this example, the figure shows the channel 0 configuration word defined with all defaults (0) except for channel enable (bit 11). The addressing reflects the location of the module as slot 1. For details on how to configure the module for your application, refer to chapter 4 and chapter 5.
  • Page 30 Quick Start Guide Program the Configuration Follow these steps to complete the programming necessary to establish the new configuration word setting in the previous step. 1. Create integer file N10 using the memory map function. Integer file N10 should contain one element for each channel used.

  • Page 31: Apply Power

    Quick Start Guide Write Remaining Ladder Logic The Channel Data Word contains the information that represents the temperature value or resistance value of the input channel. Write the remainder of the ladder logic program that specifies how your RTD/resistance input data is processed for your application. In this procedure, the addressing reflects the location of the module as slot 1.
  • Page 32 Quick Start Guide Program Functional Check (Optional) Monitor the status of input channel 0 to determine its configuration setting and operational status. This is useful for troubleshooting when the blinking channel LED indicator indicates that an error has occurred. If the Module Status LED indicator is off, or if the Channel 0 LED indicator is off or blinking, refer to chapter 7.

  • Page 33: Chapter 3 Emc Directive

    Chapter Install and Wire the Module This chapter tells you how to: • avoid electrostatic damage. • determine the RTD module’s chassis power requirement. • choose a location for the RTD module in the SLC chassis. • install the RTD module. •...

  • Page 34: Nr4 Power Requirements

    Install and Wire the Module • Touch a grounded object to rid yourself of electrostatic charge before handling the module. • Handle the module from the front, away from the backplane connector. Do not touch backplane connector pins. • Keep the module in its static-shield bag when not in use, or during shipment.

  • Page 35: Module Location In Chassis

    Install and Wire the Module Module Location in Chassis This section contains information on module location in modular and fixed chassis. Modular Chassis Considerations Place your RTD module in any slot of an SLC 500 modular chassis (except slot 0) or a modular expansion chassis. Slot 0 is reserved for the modular processor or adapter modules.
  • Page 36 Install and Wire the Module Fixed Controller Compatibility Table Modules 5V dc (Amps) 24V dc (Amps) 0.035 • • 0.050 • IA16 0.085 • 0.035 • 0.050 • IM16 0.085 • 0.185 • OA16 0.370 • OAP12 0.370 • 0.050 •...

  • Page 37: General Considerations

    Install and Wire the Module Fixed Controller Compatibility Table Modules 5V dc (Amps) 24V dc (Amps) • 0.085 0.090 Δ NO4I 0.055 0.195 • NO4V 0.055 0.145 • ITB16 0.085 • ITV16 0.085 • IC16 0.085 • 0.150 0.40 • 0.150 0.145 •...

  • Page 38: Module Installation And Removal

    Install and Wire the Module Module Installation and When installing the module in a chassis, it is not necessary to remove the terminal block from the module. However, if the terminal block is Removal removed, use the write-on label located on the side of the terminal block to identify the module location and type.

  • Page 39: Install The Module

    Install and Wire the Module Install the Module 1. Align the circuit board of the RTD module with the card guides located at the top and bottom of the chassis. Top and Bottom Module Release(s) Card Guide 2. Slide the module into the chassis until both top and bottom retaining clips are secured.

  • Page 40: Terminal Wiring

    Install and Wire the Module Terminal Wiring The RTD module contains an 18-position, removable terminal block. The terminal pin-out is shown in RTD Connections to Terminal Block on page 42. Disconnect power to the SLC before attempting to install, ATTENTION remove, or wire the removable terminal wiring block.
  • Page 41 Install and Wire the Module For a three-wire configuration, the module can compensate for a maximum cable length associated with an overall cable impedance of 25 ohms. Details of cable specifications are shown on page 122. IMPORTANT As shown in RTD Connections to Terminal Block on page 42, three configurations of RTDs can be connected to the RTD module, namely: •...
  • Page 42 Install and Wire the Module • Tighten terminal screws using a flat or cross-head screwdriver. Each screw should be turned tight enough to immobilize the wire’s end. Excessive tightening can strip the terminal screw. The torque applied to each screw should not exceed 0.565 Nm (5 in-lb) for each terminal.
  • Page 43 Install and Wire the Module When using a three-wire configuration, the module compensates for resistance error due to lead wire length. For example, in a three-wire configuration, the module reads the resistance due to the length of one of the wires and assumes that the resistance of the other wire is equal.
  • Page 44 Install and Wire the Module Two-wire Potentiometer Connections to Terminal Block Cable Shield Potentiometer Add jumper. Shield Chl 0 RTD Chl 0 Sense Chl 0 Return Return Belden #9501 Shielded Cable Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance.
  • Page 45 Install and Wire the Module Three-wire Potentiometer Connections To Terminal Block Cable Shield Run RTD and sense wires from module to potentiometer terminal and tie them to one point. Shield Potentiometer Chl 0 RTD Sense Chl 0 Sense Return Chl 0 Return Belden #83503 or Belden #9533 Shielded Cable Potentiometer wiper arm can be connected to either the RTD or return terminal depending on whether the user wants increasing or decreasing resistance.
  • Page 46 Install and Wire the Module Follow these steps to wire your 1746-NR4 module. 1. At each end of the cable, strip some casing to expose the individual wires. 2. Trim the signal wires to 5.08 cm (2 in.) lengths. Strip about 4.76 mm (3/16 in.) of insulation away to expose the end of the wire.

  • Page 47: Auto Calibration

    Install and Wire the Module Calibration The accuracy of a system that uses the RTD module is determined by: • the accuracy of the RTD. • resistance mismatch of the cable wires that connect the RTD to the module. • the accuracy of the RTD module. For optimal performance at the customer site, the RTD module is calibrated at the factory prior to shipment.
  • Page 48 Install and Wire the Module You can command your module to perform an auto-calibration cycle by disabling a channel, waiting for the channel status bit to change state (1 to 0) and then re-enabling that channel. Several scan cycles are required to perform an auto-calibration (refer to page 4-11). It is important to remember that during auto-calibration the module is not converting input data.
  • Page 49 Install and Wire the Module 5. Use the RTD module to determine the temperature equivalent to the fixed precision resistor and cable combination. 6. Calculate the offset value by subtracting the calculated calibration temperature from the measured temperature. 7. Reconnect the RTD to the cable. 8.
  • Page 50 Install and Wire the Module Notes: Publication 1746-UM008B-EN-P - December 2006...

  • Page 51: Chapter 4 Module Id Code

    Chapter Preliminary Operating Considerations This chapter explains how the RTD module and the SLC processor communicate through the module’s input and output image. It lists the preliminary setup and operation required before the RTD module can function in a 1746 I/O system. Topics discussed include how to: •...

  • Page 52: Module Addressing

    Preliminary Operating Considerations Module Addressing The memory map displays how the output and input image tables are defined for the RTD module. Bit 15 Bit 0 Address O:e.0 Channel 0 Configuration Word Word 0 Channel 1 Configuration Word Word 1 O:e.1 O:e.2 Channel 2 Configuration Word...

  • Page 53: Input Image - Data Words And Status Words

    Preliminary Operating Considerations If you want to configure channel 2 on the RTD module located EXAMPLE in slot 4 in the SLC chassis, your address would be O:4.2 Slot File Type Word O : 4 . 2 Word Element Delimiter Delimiter Chapter 5, Channel Configuration, Data, and Status, gives you detailed bit information about the content of the data word and the status...

  • Page 54: Channel Filter Frequency Selection

    Preliminary Operating Considerations Chapter 5, Channel Configuration, Data, and Status, gives you detailed bit information about the content of the data word and the status word. The RTD module uses a digital filter that provides noise rejection for the input signals. The digital filter is programmable, allowing you to select from four filter frequencies for each channel.

  • Page 55: Effective Resolution

    Preliminary Operating Considerations Effective Resolution The effective resolution for an input channel depends upon the filter frequency selected for that channel. This table displays the effective resolution for the various input types and filter frequencies. Effective Resolution Input Type Filter Frequency 10 Hz 50 Hz 60 Hz...

  • Page 56: Channel Cut-Off Frequency

    Preliminary Operating Considerations Channel Cut-off Frequency The channel filter frequency selection determines a channel’s cut-off frequency, also called the -3 dB frequency. The cut-off frequency is defined as the point on the input channel frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation.
  • Page 57 Preliminary Operating Considerations 50 Hz Filter Notch Frequency -3 dB -100 Amplitude (in dB) -120 -140 -160 -180 -200 Frequency 13.1 Hz Frequency Response 60 Hz Filter Notch Frequency -3 dB Amplitude (in dB) -100 -120 -140 -160 -180 -200 Frequency 15.72 Hz Frequency Response...

  • Page 58: Scanning Process And Channel Timing

    Preliminary Operating Considerations Scanning Process and This section shows how to determine the channel update time and channel autocalibration time. In addition, the scanning process is Channel Timing briefly described. The RTD module channel update time is defined as the time required for the module to sample and convert (scan) the input signal of an enabled input channel and make the resulting data value available to the SLC processor for update.
  • Page 59 Preliminary Operating Considerations Channel scanning is sequential and always occurs starting with the lowest numbered enabled channel and proceeding to the next highest numbered channel, for example, channel 0 - channel 1 - channel 2 - channel 3 - channel 0 - channel 1. Channel scan time is a function of the filter frequency.
  • Page 60 Preliminary Operating Considerations Scanning Cycle Channel 1 Channel 0 Start Update Channel 1 data word. Calculate Channel 1 data. Wait for Channel 0 A/D conversion. Configure and start Channel 0 A/D. Read Channel 1 A/D. Read Channel 0 A/D. Configure and start Channel 1 A/D. Wait for Channel 1 A/D conversion.

  • Page 61: Channel Turn-On, Turn-Off, And Reconfiguration Time

    Preliminary Operating Considerations Channel Turn-on, Turn-off, The table below gives you the turn-on, turn-off, and reconfiguration times for enabling or disabling a channel. and Reconfiguration Time Function Description Duration Turn-on Time The time it takes to make converted data available in the data word and to Requires up to one module update set the status bit (transition from 0 to 1) in the status word, after setting the time plus one of the following:...

  • Page 62: Input Response

    Preliminary Operating Considerations Input Response When a RTD slot is disabled, the RTD module continues to update its input image table. However, the SLC processor does not read inputs from a module that is disabled. Therefore, when the processor disables the RTD module slot, the module inputs appearing in the processor input image remain in their last state and the module’s updated image table is not read.

  • Page 63: Channel Configuration

    Chapter Channel Configuration, Data, and Status This chapter examines the channel configuration word and the channel status word bit by bit. It explains how the module uses configuration data and generates status during operation. It gives you information about how to: •...

  • Page 64: Channel Configuration Procedure

    Channel Configuration, Data, and Status Module default settings for configuration words 0…7 are all zeros. Scaling defaults are explained on page 78 under the explanation for the Scaling Select (Bits 13-14). The channel configuration word consists of bit fields, the settings of which determine how the channel operates.
  • Page 65 Channel Configuration, Data, and Status 6. If the channel is configured for RTD inputs and engineering units data format, determine if you want the channel data word to read in ° C or ° F and enter a one or a zero in bit 8 (Temperature Units) of the configuration word.
  • Page 66 Channel Configuration, Data, and Status Channel Configuration Word (O:e.0 through O:e.3) - Bit Definitions Bit(s) Define To select Make these bit settings in the Channel Configuration Word 100 Ω Pt RTD (385) 200 Ω Pt RTD (385) 500 Ω Pt RTD (385) 1000 Ω...
  • Page 67 Channel Configuration, Data, and Status Input Type Selection (Bits 0…3) The input type bit field lets you configure the channel for the type of input device you have connected to the module. Valid input devices are shown in the Channel Configuration Word (O:e.0 through O:e.3) - Bit Definitions table.
  • Page 68 Channel Configuration, Data, and Status Using Scaled-for-PID and Proportional Counts Formats The RTD module provides eight options for displaying input channel data. These are 0.1 °F, 0.1 °C, 1 °F, 1 °C, 0.1 Ω, 1 Ω, Scaled-for-PID, and Proportional Counts. The first six options represent real engineering units and do not require explanation.
  • Page 69 Channel Configuration, Data, and Status The Linear Relationship Between Temperature and PID Counts graph shows the linear relationship between output counts and temperature when one uses scaled–for–PID data format. Linear Relationship Between Temperature and PID Counts Counts 16383 ±200 C 630 C Proportional Counts Data Format If the user selects proportional counts data format, the data word for...
  • Page 70 Channel Configuration, Data, and Status Linear Relationship Between Temperature and Proportional Counts C ounts + 32,767 ±200 C 630 C ± 32,768 Publication 1746-UM008B-EN-P - December 2006...
  • Page 71 Channel Configuration, Data, and Status Scaling Examples The following examples are using the default scaling ranges. Scaled-for-PID to Engineering Units Equation Engr Units Equivalent = S + [(S ) x (Scaled-for-PID value displayed / 16383)] HIGH Assume that the input type is an RTD, Platinum (200Ω, a = 0.00385 °C, range = -200 °C…850 °C), scaled-for-PID display type.
  • Page 72 Channel Configuration, Data, and Status The Data Formats for RTD Temperature Ranges for 0.5 and 2.0 mA Excitation Current table shows the temperature ranges of several 1746-NR4 RTDs. The table applies to both 0.5 and 2.0 mA excitation currents. The temperature ranges of the remaining RTD units vary with excitation current, for example, 1000 Ω...
  • Page 73 Channel Configuration, Data, and Status Data Format for 10 Ω Copper 426 RTD Data Format Excitation Current Engineering Units x 1 Engineering Units x 10 Proportional Counts Scaled-for-PID (Defaults) 0.1 °C 0.1 °F 1.0 °C 1.0 °F 0.5 mA not allowed 2.0 mA -1000…2600 -1480…5000...
  • Page 74 Channel Configuration, Data, and Status The Channel Data Word Resolution for RTDs table shows the data resolution provided by the 1746-NR4 for RTD input types using the various data formats. Channel Data Word Resolution for RTDs Data Format (Bits 4 and 5) Engineering Units Proportional Counts RTD Input Type...

  • Page 75: Broken Input Selection (Bits 6 And 7)

    Channel Configuration, Data, and Status Channel Data Word Resolution for 500 Ω, 1000 Ω, and 3000 Ω Resistance Inputs Data Format (Bits 4 and 5) Resistance Input Proportional Engineering Units x 1 Engineering Units x 10 Scaled-for-PID Type Counts (Defaults) Ohms Ohms Ohms...
  • Page 76 Channel Configuration, Data, and Status Temperature Units Selection (Bit 8) The Bit Descriptions for Temperature Units Selection table shows the description for bit 8. The temperature units bit lets you select temperature engineering units in °C or °F for RTD input types. This bit field is only active for RTD input types.

  • Page 77: Excitation Current Selection (Bit 12)

    Channel Configuration, Data, and Status When set (1), the channel enable bit is used by the module to read the configuration word information you have selected. While the enable bit is set, modification of the configuration word may lengthen the module update time for one cycle. If any change is made to the configuration word, the change must be reflected in the status word before new data is valid.
  • Page 78 Channel Configuration, Data, and Status Scaling Select (Bits 13-14) If you selected proportional counts as the format for your input data, you can enter a scaling range that ensures your data is scaled within a range appropriate for your use. You can use words 4 and 5 to define one range and words 6 and 7 to define a second range.
  • Page 79 Channel Configuration, Data, and Status User-set Scaling Proportional Counts - The second case to consider is User-set Scaling using proportional counts when the scaling select bits 13 and 14 are set to 01 or 10. Here you can configure the module to scale the data word to something other than -32,768 to 32,767.
  • Page 80 Channel Configuration, Data, and Status User-set Scaling Using Proportional Counts Data Format Selected Proportional Counts Data Format Selected 1000 Pot Selected Configuration Words 4 & 5 for Scaling O:e.3 CH 3 Configuration W ord O:e.4 Lower scale limit set for 3 Range 0 O:e.5 Upper scale limit set for 50...

  • Page 81: Unused (Bit 15)

    Channel Configuration, Data, and Status Unused (Bit 15) Bit 15 is not used. Verify that this bit is always cleared (0). The actual RTD or resistance input sensor values reside in I:e.0 through I:e.3 of the RTD module input image file. The data values present depend on the input type and data format you have selected in your configuration for the channel.

  • Page 82: Channel Status Checking

    Channel Configuration, Data, and Status Channel Status Checking The channel status word is a part of the RTD module’s input image. Input words 4…7 correspond to and contain the configuration status of channels 0, 1, 2, and 3 respectively. You can use the data provided in the status word to determine if the data word for any channel is valid per your configuration in O:e.0 through O:e.3.
  • Page 83 Channel Configuration, Data, and Status Channel 0…3 Status Word (I:e.4 through I:e.7) - Bit Definitions These bit settings Bits Define Indicate this 15 14 13 12 11 10 9 100 Ω Pt RTD (385) 200 Ω Pt RTD (385) 500 Ω Pt RTD (385) 1000 Ω...
  • Page 84 Channel Configuration, Data, and Status The status bits reflect the settings that were made in the configuration IMPORTANT word. However, two conditions must be true if the status reflected is to be accurate. • The channel must be enabled. • The channel must have processed any new configuration data. Input Type Status (Bits 0…3) The input type bit field indicates what type of input device you have configured for the channel.
  • Page 85 Channel Configuration, Data, and Status Channel Filter Frequency (Bits 9 and 10) The channel filter frequency bit field reflects the filter frequency you selected in bits 9…10 of the configuration word when the channel is enabled. This feature is active for all input types. If the channel is disabled, these bits are cleared (0).
  • Page 86 Channel Configuration, Data, and Status Out-of-range Error (Bit 14) This bit is set (1) whenever a configured channel detects an over-range condition for the input channel data, regardless of input type. This bit is also set (1) whenever the module detects an under-range condition when the input type is an RTD.

  • Page 87: Ladder Programming Examples

    Chapter Ladder Programming Examples Earlier chapters explained how the configuration word defines the way a channel operates. This chapter shows the programming required to enter the configuration word into the processor memory. It also provides you with segments of ladder logic specific to unique situations that might apply to your programming requirements.

  • Page 88: Initial Programming

    Ladder Programming Examples Application Setup 1746-NR4 RTD Module 1746-OB8 DC Output Module (Sourcing) 1746-IB8 DC Input Module (Sinking) RTD 0 SLC Processor Slot # RTD 1 RTD 2 Pilot Light O:2/1 RTD 3 Pilot Light O:2/3 Pilot Light O:2/0 Ch. 0 Alarm Ch.
  • Page 89 Ladder Programming Examples Configuration Word Setup Bit Number Bit Setting Configures Channel For: 200 Ω Platinum RTD (385) Eng. Units x 10 (1 °F/ step) Broken Input (Zero Data Word) Degrees Fahrenheit (°F) 10 Hz Filter Frequency Channel Enabled 2.0 mA Excitation Current Default Scaling Not Used This example transfers configuration data and sets the channel enable...

  • Page 90: Programming Procedure

    Ladder Programming Examples Programming Procedure 1. Create integer file N10 in your programming software. Integer file N10 should contain four elements (N10:0 through N10:3). 2. Enter the configuration parameters for all four RTD channels into a source integer data file N10. Refer to the Configuration Word Setup for the bit values.

  • Page 91: Dynamic Programming

    Ladder Programming Examples Dynamic Programming The programming example explains how to change data in the channel configuration word when the channel is currently enabled. Execute a dynamic configuration change to channel 2 of the EXAMPLE RTD module located in slot 3 of a 1746 chassis. Change from monitoring the temperature in °F to monitoring in °C.

  • Page 92: Verify Channel Configuration Changes

    Ladder Programming Examples Verify Channel When executing a dynamic channel configuration change, there is always a delay from the time the ladder program makes the change to Configuration Changes the time the RTD module gives you a data word using that new configuration information.

  • Page 93: Interface To The Pid Instruction

    Ladder Programming Examples Program to Verify Configuration Word Data Changes - Continued Check that the configuration written to channel 2 is Rung 2:4 being echoed back in channel 2's status word. Data valid EQUAL Source A N7:1 Source B Rung 2:5 Interface to the PID The RTD module was designed to interface directly to the SLC 5/02, SLC 5/03, SLC 5/04, and SLC 5/05 PID instruction without the need for...
  • Page 94 Ladder Programming Examples Initialize NR4 Channel 0 Rung 2:0 First Pass Bit MOVE Source N10:0 Dest O:3.0 Entering address N1 1:0 allocates elements N11:0 to N11:22 for required Control Block file length of 23 words. The Process Variable is address Rung 2:1 Channel 0 I:3.0, which stores the value of input data word 0 (channel 0).

  • Page 95: Use The Proportional Counts Data Format With User-Set Scaling

    Ladder Programming Examples Use the Proportional The RTD module can be set up to return data to the user program that is specific to the application. Assume that you control the line speed Counts Data Format with of a conveyor using a 1000 Ω potentiometer connected to channel 0 of User-set Scaling the RTD module.

  • Page 96: Monitor Channel Status Bits

    Ladder Programming Examples Monitor Channel Status The Programming to Monitor Channel Status ladder diagram shows how you could monitor the open- and short-circuit error bits of each Bits channel and set an alarm in the processor if one of the RTDs or resistance-input devices (such as a potentiometer) opens or shorts.

  • Page 97: Invoke Autocalibration

    Ladder Programming Examples Invoke Autocalibration Autocalibration of a channel occurs whenever: • a channel first becomes enabled. • when a change is made to its input type, filter frequency, or excitation current. • whenever an operating channel is disabled and re-enabled using its enable bit.
  • Page 98 Ladder Programming Examples Programming to Invoke Autocalibration Rung 2:0 Condition for Channel 0 Enable Autocalibration O:3.0 [OSR] Channel 0 Flag Rung 2:1 Channel 0 Status Channel 0 Flag Channel 0 Enable O:3.0 I:3.4 Channel 0 Flag The RTD module responds to processor commands much more IMPORTANT frequently than it updates its own LED indicators.

  • Page 99: Module Diagnostics And Troubleshooting

    • Module operation vs. channel operation • Power-up diagnostics • Channel diagnostics • LED indicators • Troubleshooting flowchart • Replacement parts • Contacting Rockwell Automation Module Operation vs. The RTD module performs operations at two levels. Channel Operation • Module-level operations • Channel-level operations Module-level operations include functions such as power up configuration and communication with the SLC processor.

  • Page 100: Power Turn-On Diagnostics

    Module Diagnostics and Troubleshooting A series of internal diagnostic self-tests is performed when power is applied to the module. The module status LED indicator and all channel status LED indicators remain off while power is applied. If any diagnostic test fails, the module enters the module error state. If all tests pass, the module status LED indicator is turned on and the channel status LED indicator is turned on for the respective enabled channel.
  • Page 101 Module Diagnostics and Troubleshooting The LED Indicator Status Description table explains the function of the channel status LED indicators while the module status LED indicator is turned on. LED Indicator Status Description If Module And Channel Indicated Condition Corrective Action Status LED Status LED Indicator is...

  • Page 102: Error Codes

    Module Diagnostics and Troubleshooting Error Codes The error codes applicable to the RTD module range from 50H to 5AH. These are non-recoverable errors. For a description of the error codes, refer to SLC 500 Instruction Set Reference Manual (Publication 1747–RM001). Error Code Format XX ±...

  • Page 103: Open- And Short-Circuit Detection

    Module Diagnostics and Troubleshooting Open- and Short-circuit Detection An open- or short-circuit test is performed on all enabled channels on each scan. Whenever an open-circuit or short-circuit condition occurs, the channel LED indicator blinks and bit 13 of the channel status word is set.
  • Page 104 Failure of any diagnostic test places the module in a non-recoverable state. To exit this state, cycle power. If the power cycle does not work, then call your local distributor or Rockwell Automation for assistance. Publication 1746-UM008B-EN-P - December 2006...
  • Page 105 Module Diagnostics and Troubleshooting Troubleshooting Flowchart Check LED indicators on module. Channel Status Channel Status Channel Status Module Status Module Status LED indicator LED indicators LED indicator LED indicator is off. LED indicator is on. is on. blinking is off. Channel is enabled Module fault Normal module...

  • Page 106: Replacement Parts

    1746-R13 series G 1746-NR4 User Manual 1746-6.7 Contact Rockwell If you need to contact Rockwell Automation for assistance, please have the following information available when you call. Automation • A clear statement of the problem including a description of what the system is actually doing.

  • Page 107: Application Examples

    Chapter Application Examples This chapter provides two application examples to help you use the RTD input module. They are defined as a: • basic example. • supplementary example. The basic example builds on the configuration word programming provided in chapter 6 to set up one channel for operation. This setup is then used in a typical application to display temperature.

  • Page 108: Channel Configuration

    Application Examples Channel Configuration Configure the RTD channel with the following setup: • 200 Ω Platinum RTD • °F in whole degrees • Zero data word in the event of an open or short circuit • 10 Hz input filter •...

  • Page 109: Program Listing

    Application Examples 0110 = 500 Ω Pt. (3916) 0000 = 100 Ω Pt. (385) 0111 = 1000 Ω Pt. (3916) 0001 = 200 Ω Pt. (385) 1100 = 150 Ω Potentiometer 0010 = 500 Ω Pt. (385) 1000 = 10 Ω Cu (426) 1001 = 500 Ω...
  • Page 110 Application Examples Program to Convert °F to BCD Rung 2.0 Initialize Channel 0 of RTD Module. First Pass Bit MOVE Source N10:0 Dest O:3.0 Rung 2.1 Convert the channel 0 data word (degrees F) to BCD values and write this to the LED display. If channel 0 is ever disabled, a zero is written to the display TO BCD Source...

  • Page 111: Supplementary Example

    Application Examples Supplementary Example This example provides the application setup, channel configuration, and program setup. Application Setup (Four Channels °C ↔ °F) Device Configuration for Displaying Many RTD Outputs shows how to display the temperature of several different RTD units at one annunciator panel.
  • Page 112 Application Examples Channel Configuration See completed worksheet in Channel Configuration Worksheet (With Settings Established) on page 113. Configuration setup for ambient RTD includes the following: • channel 0 • 604 Ω Nickel/Iron (518) • display temperature to tenths of a degree Celsius •...
  • Page 113 Application Examples Channel Configuration Worksheet (With Settings Established) Bit Number Channel 0 (Ambient) Channel 1 (Bath) Channel 2 (Steam) Channel 3 (Chilled H Input Type Select Data Format Select Broken Input Select Temperature Units Select Filter Frequency Select Channel Enable Excitation Current Select Scaling Select Not Used...
  • Page 114 Application Examples Program Setup and Operation Summary 1. Set up two configuration words in memory for each channel, one for °C and the other for °F. Channel Configuration Word Allocation °F °C N10:0 N10:4 N10:1 N10:5 N10:2 N10:6 N10:3 N10:7 2.
  • Page 115 Application Examples Program Listing The first two rungs of this program send the correct channel setup information to the RTD module based on the position of the degrees selector switch. Program to Display Data on LED Displays Rung 2.0 If the degrees selector switch is turned to the Fahrenheit position, set up all four channels to read in degrees Fahrenheit.
  • Page 116 Application Examples Rung 2.4 Write RTD Module Steam Temperature to Display TO BCD Source I:1.2 Dest O:5.0 Rung 2.5 Write RTD Module Chilled Temperature to Display TO BCD Source I:1.3 Dest O:6.0 Rung 2.6 Publication 1746-UM008B-EN-P - December 2006...

  • Page 117: Specifications

    Appendix Specifications This appendix lists the specifications for the 1746-NR4 RTD Input Module. 1746-NR4 Electrical Specifications Backplane current consumption 50 mA at 5V dc 50 mA at 24V dc Backplane power consumption 1.5 W max (0.3 W at 5V dc, 1.2 W at 24V dc) External power supply requirements None...
  • Page 118 Specifications Physical Specifications LED indicators 5 green status indicators, one for each of 4 channels and one for module status Module ID code 3513 Max termination wire size Two 2.5 mm (14 AWG) wire per terminal 25 Ω max impedance for three-wire RTD Max cable impedance configuration (see Cable Specifications) Terminal block...

  • Page 119: Appendix A Module Accuracy

    Specifications Input Specifications Channel turn-off time Requires up to one module update time. Reconfiguration time Requires up to one module update time plus one of the following: • 250 Hz Filter = 124 ms • 60 Hz Filter = 504 ms •...
  • Page 120 Specifications RTD Temperature Ranges, Resolution, and Repeatability Temp. Range Temp. Range RTD Type Resolution Repeatability (0.5 mA Excitation) (2.0 mA Excitation) 120 Ω -100…260 °C -100 …260 °C 0.1 °C ±0.2 °C (1)(3) Nickel (618) (-148…500 °F) (-148…500 °F) (0.2 °F) (±0.4 °F) 120 Ω...
  • Page 121 Specifications RTD Accuracy and Temperature Drift Specification Accuracy Accuracy Temperature Drift Temperature Drift RTD Type (0.5 mA Excitation) (2.0 mA Excitation) (0.5 mA Excitation) (2.0 mA Excitation) 10 Ω ±0.6 °C Not allowed. ±0.017 °C/°C Not allowed. (1)(2) Copper (426) (±1.1 °F) (±0.031 °F/°F) 120 Ω...
  • Page 122 Specifications Resistance Device Compatibility Resistance Input Specification Input Type Resistance Range Resistance Range Temperature Resolution Repeatability Accuracy (0.5 mA Excitation) (2.0 mA Excitation) Drift 150 Δ 0 Δ to 150 Δ 0 Δ to 150 Δ 0.01 Δ X 0.4 Δ 500 Δ...

  • Page 123: Rtd Standards

    Appendix RTD Standards The following table shows various international and local RTD standards that apply to the 1746-NR4: RTD Type ∝ D100 SAMA JIS (old) JIS (new) Minco 100 Ω Platinum 0.00385 200 Ω Platinum 0.00385 500 Ω Platinum 0.00385 1000 Ω...
  • Page 124 RTD Standards Notes: Publication 1746-UM008B-EN-P - December 2006...

  • Page 125: Channel Configuration Procedure

    Appendix Configuration Worksheet for RTD/Resistance Module The following configuration procedure and worksheet are provided to help you configure each of the channels on your RTD module. The channel configuration word consists of bit fields, the settings of which determine how the channel will operate. This procedure looks at each bit field separately and helps you configure a channel for operation.
  • Page 126 Configuration Worksheet for RTD/Resistance Module 2. Select a data format for the data word value. Your selection determines how the analog input value registered by the analog sensor will be expressed in the data word. Enter your 2-digit binary code in bit field 4 and 5 of the channel configuration word.
  • Page 127 Configuration Worksheet for RTD/Resistance Module 6. Determine the desired input filter frequency for the channel and enter the 2-digit binary code in bit field 9 and 10 of the channel configuration word. A smaller filter frequency increases the channel update time, but also increases the noise rejection.

  • Page 128: Channel Configuration Worksheet

    Configuration Worksheet for RTD/Resistance Module 11. Build the channel configuration word for every channel that is being used on each RTD module repeating the procedures given in steps 1…10. 12. Enter the completed configuration words for each module into the summary worksheet on the following page. 13.
  • Page 129 Configuration Worksheet for RTD/Resistance Module Bits 9 Filter Frequency 00 = 10 Hz 01 = 50 Hz 10 = 60 Hz 11 = 250 Hz and 10 Select Bit 11 Channel Enable 0 = channel disabled 1 = channel enabled Bit 12 Excitation Current 0 = 0.2 mA...
  • Page 130 Configuration Worksheet for RTD/Resistance Module Notes: Publication 1746-UM008B-EN-P - December 2006...
  • Page 131 Appendix I/O Configuration This section contains information on the I/O configuration procedure for RSLogix 500 Version 6.0 and later software. 1. Open the IO Configuration in RSLogix 500 software. 2. Add the 1746-NR4 module in the correct rack slot. Publication 1746-UM008B-EN-P - December 2006...
  • Page 132 I/O Configuration 3. Click Adv Config to access more configuration options. 4. Click Configure to access the channel configuration options. Publication 1746-UM008B-EN-P - December 2006...
  • Page 133 I/O Configuration Each tab is labeled with the corresponding channel that it will configure. The pull down menus let you chose the various parameters for the channel. Each menu effects the corresponding bits for the configuration data file. Input Type changes bits 0…3 and chooses the type of RTD/Resistance input.
  • Page 134 I/O Configuration 6. Click OK. RSLogix 500 software automatically places a rung in the ladder logic that you defined. The data file is also automatically changed to match the channel parameters entered. Publication 1746-UM008B-EN-P - December 2006...
  • Page 135 Glossary The following terms and abbreviations are specific to this product. For a complete listing of Allen-Bradley terminology, refer to the Allen-Bradley Industrial Automation Glossary, Publication Number AG-7.1. Refers to the analog-to-digital converter inherent to the RTD/Resistance input module. The converter produces a digital value whose magnitude is proportional to the instantaneous magnitude of an analog input signal.
  • Page 136 Glossary cut-off frequency The frequency at which the input signal is attenuated 3 dB by the digital filter. Frequency components of the input signal below the cut-off frequency are passed with under 3 dB of attenuation. data word A 16-bit integer that represents the value of the analog input channel. The channel data word is valid only when the channel is enabled and there are no channel errors.

  • Page 137: Local Configuration

    Glossary full scale range (FSR) The difference between the maximum and minimum specified analog RTD or resistive input values. gain drift The change in full scale transition voltage measured over the operating temperature range of the module. input data scaling The data formats that you select to define the logical increments of the channel data word.
  • Page 138 Glossary remote configuration A control system where the chassis can be located several thousand feet from the processor chassis. Chassis communication is via the 1747-SN Scanner and 1747-ASB Remote I/O Adapter. resolution The smallest detectable change in a measurement, typically expressed in engineering units (for example, 0.1 °C) or as a number of bits.
  • Page 139 Index CMRR 135 common mode rejection ratio 135 A/D 135 common mode voltage 135 addressing 52 compatibility 13 configuration word 52 with RTD sensors 13 addressing example 52 with SLC controllers 13 data word 53 configuration word 52 status words 53 configuring a channel 63 addressing example 53 connection diagram 40...

  • Page 140: Installation

    Index European Union Directives Compliance LED indicators 17 examples channel status 17 how to address configuration word 52 module status 17 how to address data word 53 LSB 137 how to address status word 53 how to use PID instruction 93 how to use proportional counts data 95 using alarms to indicate status 96 module accuracy 119...
  • Page 141 Index repeatability 122 single-point calibration 48 resolution 122 slot disabling 61 wiring diagram 44 specifications 117 wiring inputs 42 cable 122 programming 87 electrical 117 configuration settings module accuracy 119 initial settings 88 start-up instructions 23 making changes 88 status word 82 PID instruction 93 step response 138 verifying channel configuration changes...
  • Page 142 Index Publication 1746-UM008B-EN-P - December 2006...
  • Page 143 ___No, there is no need to contact me ___Yes, please call me ___Yes, please email me at _______________________ ___Yes, please contact me via _____________________ Return this form to: Rockwell Automation Technical Communications, 1 Allen-Bradley Dr., Mayfield Hts., OH 44124-9705 Fax: 440-646-3525 Email: RADocumentComments@ra.rockwell.com Publication CIG-CO521C-EN-P- May 2003...

  • Page 144: Business Reply Mail

    PLEASE FASTEN HERE (DO NOT STAPLE) Other Comments PLEASE FOLD HERE NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES BUSINESS REPLY MAIL FIRST-CLASS MAIL PERMIT NO. 18235 CLEVELAND OH POSTAGE WILL BE PAID BY THE ADDRESSEE 1 ALLEN-BRADLEY DR MAYFIELD HEIGHTS OH 44124-9705...

  • Page 148: Rockwell Automation Support

    Outside United Please contact your local Rockwell Automation representative for States return procedure. Publication 1746-UM008B-EN-P - December 2006 PN XXXXXX-XX Supersedes Publication 1746-6.7 - June 1998 Copyright © 2006 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.

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