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Allen-Bradley 1746-NIO4I User Manual

4-channel analog i/o modules
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SLC™ 500
4-Channel Analog
I/O Modules
(Catalog Numbers 1746-NI4,
1746-NIO4I, 1746-NIO4V,
1746-NO4I, and 1746-NO4V)
User Manual

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Summary of Contents for Allen-Bradley 1746-NIO4I

  • Page 1 SLC™ 500 4-Channel Analog I/O Modules (Catalog Numbers 1746-NI4, 1746-NIO4I, 1746-NIO4V, 1746-NO4I, and 1746-NO4V) User Manual...
  • Page 2 Important User Information Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication SGI-1.1 available from your local Rockwell Automation sales office or online at http://www.ab.com/manuals/gi) describes some important differences between solid state equipment and hard-wired electromechanical devices.
  • Page 3 Summary of Changes The information below summarizes the changes to this manual since the last printing. To help you find new and updated information in this release of the manual, we have included change bars as shown to the right of this paragraph.
  • Page 4 Summary of Changes Publication 1746-UM005B-EN-P - June 2004...

  • Page 5: Table Of Contents

    Switch Settings for the 1746–NI4....3-5 Switch Settings for the 1746-NIO4I and -NIO4V..3-5 External Power Switch for the 1746-NO4I and -NO4V . . 3-6 Choosing a Slot in the Chassis .
  • Page 6 Table of Contents Chapter 4 Module Operation and System Interface between the Module and the Processor ..4-1 Entering Module ID Codes ..... . 4-1 Considerations Addressing Analog Modules .
  • Page 7 Table of Contents Calculating the Shifted Linear Relationship ..6-15 Using Standard Math ......6-16 Using the Scale with Parameters (SCP) Instruction .
  • Page 8 Table of Contents Publication 1746-UM005B-EN-P - June 2004...

  • Page 9: Preface

    Preface Read this preface to familiarize yourself with the rest of the manual. It provides information concerning: • who should use this manual • the purpose of this manual • related documentation • conventions used in this manual • Rockwell Automation support Who Should Use this Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use SLC 500...

  • Page 10: Related Documentation

    1746-IN008 Installation Instructions Information on reducing electrical noise. System Design for Control of Electrical GMC-RM001 Noise In-depth information on grounding and wiring Allen-Bradley® Allen-Bradley Programmable Controller 1770-4.1 programmable controllers. Grounding and Wiring Guidelines A description of important differences between solid-state Application Considerations for Solid-State SGI-1.1...

  • Page 11: Common Techniques Used In This Manual

    Preface If you would like a manual, you can: • download an electronic version from the internet at: – www.theautomationbookstore.com – http://ab.com/manuals • order a printed manual by: – contacting your local distributor or Rockwell Automation representative – visiting www.theautomationbookstore.com –...
  • Page 12 Preface Publication 1746-UM005B-EN-P - June 2004...

  • Page 13: Overview

    Chapter Overview This chapter describes how analog is used and provides two application examples of analog. The types of available analog modules and their related specifications are also described. How to Use Analog Analog refers to the representation of numerical quantities by the measurement of continuous physical variables.

  • Page 14: 1746-Ni4 Analog Input Module

    The NIO4I and NIO4V Analog Combination I/O modules provide two input and two output channels in a single slot module. The 1746-NIO4I module contains two current or voltage inputs (user selectable per channel), and two current outputs. The 176-NIO4V module contains two current or voltage inputs (user selectable per channel) and two voltage outputs.

  • Page 15: Quick Start For Experienced Users

    Chapter Quick Start for Experienced Users This chapter can help you to get started using analog. The procedures are based on the assumption that you have an understanding of SLC 500 products. You should understand electronic process control and be able to interpret the ladder logic instructions required to generate the electronic signals that control your application.

  • Page 16: Procedures

    Catalog Number Backplane Current Draw External 24V dc Power Supply Tolerance 5V (max.) 24V (max.) 1746-NI4 35 mA 85 mA 1746-NIO4I 55 mA 145 mA 1746-NIO4V 55 mA 115 mA 1746-NO4I 55 mA 195 mA 24 ±10% at 195 mA max.
  • Page 17 1 2 3 4 1746-NI4 Switch 2 = Channel 1 Switch 3 = Channel 2 Switch 4 = Channel 3 Voltage Current 1746-NIO4I, NIO4V Switch 1 = Channel 0 Switch 2 = Channel 1 Voltage External 24V dc 1746-NO4I, NO4V...
  • Page 18 Quick Start for Experienced Users Make sure system power is off; then insert the analog module into your 1746 chassis. In this example procedure, local slot 1 is selected. Top and Bottom Module Release(s) Card Guide Wire the module. Reference Important: Follow these guidelines when wiring the module.
  • Page 19 Quick Start for Experienced Users analog IN 0 + source IN 0 earth ANL COM ground IN 1 + analog IN 1 source ANL COM earth IN 2 + ground IN 2 ANL COM Jumper unused IN 3 + inputs. IN 3 ANL COM NIO4I &...
  • Page 20 OTHER at the bottom of the list and enter the module’s ID code at the prompt. Operation and System Considerations) Catalog No. Module ID Code 1746-NI4 4401 1746-NIO4I 3201 1746-NIO4V 3202 1746-NO4I 5401 1746-NO4V 5402 Check that the module is operating correctly.
  • Page 21 Quick Start for Experienced Users Understanding analog inputs. Reference Analog inputs convert current and voltage signals into 16–bit (max.) integer values and place Chapter 4 them in the input image for the slot that the analog module resides in. (Module Operation and System Considerations)
  • Page 22 Quick Start for Experienced Users Understanding analog outputs. Reference Analog outputs convert 16-bit integer values placed in the output image to voltage or current Chapter 4 signals for the slot that the analog card is in. (Module Operation and System Considerations) Address 1746-NO4 1746-NI04I, -NI04V...

  • Page 23: Installing And Wiring Your Analog Module

    Chapter Installing and Wiring Your Analog Module To obtain the maximum performance from an analog module, proper module installation is imperative. This chapter describes the procedures that you must follow to install the analog module in an SLC 500 system. The following items are described: •...

  • Page 24: Determining Your Power Requirements For A Modular Controller

    You must supply the appropriate loop power for loop-powered input devices. Catalog Number 5 Volt Current 24 Volt Current 1746-NI4 35 mA 85 mA 1746-NIO4I 55 mA 145 mA 1746-NIO4V 55 mA 115 mA 1746-NO4I 55 mA...
  • Page 25 Installing and Wiring Your Analog Module NIO4I NIO4V NO4I NO4V • • • • ∇ • • • • ∇ • • • • IA16 ∇ • • • • ∇ • • • • ∇ • • • • IM16 ∇...
  • Page 26 Installing and Wiring Your Analog Module NIO4I NIO4V NO4I NO4V ∇ • • • • IV32 ∇ • • • • IB32 ∇ ∇ • ∇ ∇ ∇ ∇ ∇ NO4I ∇ ∇ ∇ ∇ ∇ NO4V ∇ • • •...

  • Page 27: Configuring Your Module

    Switch 3 = Channel 2 Switch 4 = Channel 3 Voltage Switch Settings for the 1746-NIO4I and -NIO4V The NIO4I and NIO4V have 2 individual switches labeled 1 and 2. These switches control the input mode of input channel 0 and 1. A switch in the ON position configures the channel for current input.

  • Page 28: External Power Switch For The 1746-No4I And -No4V

    Installing and Wiring Your Analog Module External Power Switch for the 1746-NO4I and -NO4V The NO4I and NO4V analog output modules have an external 24V dc power switch, SW1, which gives you the option of using an external power supply. In the UP position, power is drawn from an external power source.

  • Page 29: Removing The Analog Module Terminal Block

    Installing and Wiring Your Analog Module Never install, remove, or wire modules with power ATTENTION applied to the chassis. Also, do not expose analog modules to surfaces or other areas that may typically hold an electrostatic charge. Electrostatic charges can destroy the analog circuitry.

  • Page 30: Wiring Considerations

    Installing and Wiring Your Analog Module 2. Align the circuit board of the analog module with the card guide of the chassis. 3. Slide the module in until both top and bottom retaining clips are secured. Top and Bottom Module Release(s) Card Guide 4.

  • Page 31: System Wiring Guidelines

    Installing and Wiring Your Analog Module System Wiring Guidelines Use the following guidelines in planning the system wiring for the analog modules: • all analog common terminals (ANL COM) are electrically connected inside the module. ANL COM is not connected to earth ground inside the module.

  • Page 32: Determining The Cable Length

    3-10 Installing and Wiring Your Analog Module F oil Shield Insulation Black Wire Drain Wire Clear Wire Determining the Cable Length Determine the length of cable you will need to connect a channel to its input or output device. Remember to leave additional length to route the drain wire and foil shield for earth grounding.
  • Page 33 Installing and Wiring Your Analog Module 3-11 5. At End 2, cut the drain wire and foil shield back to the cable and apply shrink wrap. 6. Connect the signal wires (black and clear) to the terminal block and the input and output devices. The recommended maximum torque is 5 lb.-in (0.565 NM) for all terminals.

  • Page 34: Labeling And Installing The Terminal Block

    3-12 Installing and Wiring Your Analog Module Labeling and Installing the The terminal block has a write-on label. Labeling the terminal block will help ensure that it is installed on the correct module. Terminal Block SLOT ____ RACK ____ MODULE _____ Note: The black dot on the terminal block label indicates the position of terminal 0.
  • Page 35 Installing and Wiring Your Analog Module 3-13 analog IN 0 + source – IN 0 – earth ANL COM ground IN 1 + analog IN 1 – source ANL COM – earth IN 2 + ground IN 2 – Jumper unused ANL COM inputs.

  • Page 36: Wiring Schematics For 2, 3, And 4-Wire Analog Input Devices

    3-14 Installing and Wiring Your Analog Module Wiring Schematics for 2, 3, and 4-Wire Analog Input Devices Important: The module does not provide loop power for analog inputs. Use a power supply that matches the transmitter specifications. 2-Wire Transmitter Transmitter –...

  • Page 37: Wiring Schematic For Single-Ended Analog Input Connections

    Installing and Wiring Your Analog Module 3-15 Wiring Schematic for Single-ended Analog Input Connections When wiring single-ended analog input devices to the analog input card, the number of total wires necessary can be limited by using the ANALOG COMMON terminal. Note that dif ferential inputs are more immune to noise than single-ended inputs.
  • Page 38 3-16 Installing and Wiring Your Analog Module • group analog and low voltage dc modules away from ac I/O or high voltage dc modules. A system may malfunction due to a change in the operating environment after a period of time. We recommend periodically checking system operation, particularly when new machinery or other noise sources are installed near the SLC 500 system.

  • Page 39: Interface Between The Module And The Processor

    HHT firmware provides a list of I/O modules. Refer to the following publications for complete information: • your programming software’s user manual • the Hand-Held Terminal User Manual Catalog No. Module ID Code 1746-NI4 4401 1746-NIO4I 3201 1746-NIO4V 3202 1746-NO4I 5401 1746-NO4V 5402...

  • Page 40: Addressing Analog Modules

    Module Operation and System Considerations Addressing Analog Modules NI4 - Each input channel of the NI4 is addressed as a single word in the input image table. The NI4 uses a total of 4 words in the input image table. The converted values from channels 0 through 3 are addressed as input words 0 through 3 respectively for the slot where the module resides.
  • Page 41 4 words Input Channel 2 Word 2 I:e.2 Input Channel 3 Word 3 I:e.3 Bit 15 Bit 0 1746-NIO4I & NIO4V SLC 500 Analog Combination Modules SLC 5/01 or 5/02 Address Data Files Output Output Output Channel 0 Word 0 O:e.0...

  • Page 42: Bit Level Addressing

    1746-NI4 CH 0 INPUT I:e.0 CH 1 INPUT I:e.1 CH 2 INPUT I:e.2 CH 3 INPUT I:e.3 1746-NIO4I & NIO4V CH 0 OUTPUT O:e.0 CH 1 OUTPUT O:e.1 CH 0 INPUT I:e.0 CH 1 INPUT I:e.1 1746-NO4I & NO4V CH 0 OUTPUT O:e.0...

  • Page 43: Processor Update Of Analog Data

    Module Operation and System Considerations Processor Update of Analog Data The analog input and output data is updated by the processor once during each scan of the user program. The table below shows typical analog update scan times and the number of input and output bits for the specified modules.

  • Page 44: Converting Analog Input Data

    Module Operation and System Considerations If you are using the Hand-Held Terminal (HHT) or the Data Table Access Module (DTAM) to monitor input and output data, the binary ™ radix is the only available option. To view the analog input and output data in decimal radix, the data must be moved to an integer data file.

  • Page 45: Converting Analog Output Data

    Module Operation and System Considerations To determine an approximate current that an input value represents, you can use the following equation: 20 mA × input value = input current (mA) 16,384 The Input Value is the decimal value of the word in the input image for the corresponding analog input.
  • Page 46 Module Operation and System Considerations Voltage Range Decimal Number of Resolution per Representation for Significant Output Word Bits -10 to +10V dc -32,768 to +32,764 14 bits - 1LSB 1.22070 mV 0 to +10V dc 0 to +32,764 13 bits - 1LSB 0 to 5V dc 0 to +16,384...

  • Page 47: System Considerations

    Retentive Programming Option This section describes the affects of a processor mode change on analog outputs. The following information applies to the 1746-NIO4I, NIO4V, NO4I and NO4V analog modules. This programming option allows you to retain analog data in the Input and Output Image tables when the SLC 500 processor: •...

  • Page 48: Retentive Analog Output Example

    4-10 Module Operation and System Considerations fault. Once the fault condition is corrected and the major fault bit in the processor is cleared, the retained data is sent to the analog output channels. If you choose not to use the retentive programming option, retained data is not sent to the output channels.

  • Page 49: Non-Retentive Analog Output Example

    Module Operation and System Considerations 4-11 Non-Retentive Analog Output Example The following example shows a non-retentive program during a program execution and for a mode change or power cycle. I1:1.0/0 MOVE Source 32767 Dest O0:2.0 I1:1.0/0 MOVE Source Dest O0:2.0 In the above example, as long as discrete input 0 is ON, the value 32767 is transferred to analog output channel 0.
  • Page 50 4-12 Module Operation and System Considerations which exceed low and high limits respectively. For this example, the analog input value is in word 1 of slot 1 (I1:1.1). Whenever the input value exceeds a limit, this program latches a binary variable in memory that could serve as an alarm indication at some other point in the program.

  • Page 51: Response To Slot Disable

    Module Operation and System Considerations 4-13 Response to Slot Disable You have the ability to disable any slot in the chassis using the processor. Before disabling any slot containing an analog module, it is important to consider how the analog module will respond when the slot is disabled.

  • Page 52: Input Channel Filtering

    4-14 Module Operation and System Considerations Input Channel Filtering The input channels for all of the analog modules incorporate extensive on board signal conditioning. The purpose of this conditioning is to reject the high frequency noise that can couple into an analog input signal while passing the normal variations of the input signal.
  • Page 53 Module Operation and System Considerations 4-15 If power line noise is coupling into the input signal through the input cable, the proper use of differential inputs reduces the effect of noise. With differential inputs, noise couples into both the plus (+) and minus (-) inputs where it is attenuated by over 105 dB (60 Hz common mode rejection).
  • Page 54 4-16 Module Operation and System Considerations Publication 1746-UM005B-EN-P - June 2004...

  • Page 55: Testing The Slc 500 System

    Chapter Testing Your Module The purpose of this chapter is to help you isolate problems in a systematic and controlled manner before beginning normal system operation. If your analog module is installed in the expansion chassis of a fixed system, test your system using the procedures described in the SLC 500 Fixed Hardware Style Installation &...

  • Page 56: Inspect The Analog Module

    Testing Your Module Inspect the Analog Module Problems can be prevented by inspecting the analog module before installing it in the SLC 500 system. Inspection should include the following steps: 1. Make sure that all voltage/current mode selection DIP switches are set properly (inputs only).

  • Page 57: Power Up The Slc 500 System

    Testing Your Module In some instances, you may not be able to disconnect a device the preferred way. In these cases, open the output circuit at a point as close as possible to the motion-causing device. For example, your output might be a relay coil which in turn energizes a motor starter. If you cannot disconnect the motor wires, open the circuit at a point between the motor starter and the relay contact.

  • Page 58: Testing Analog Inputs

    Testing Your Module Testing Analog Inputs Before testing the analog module input channels, the SLC 500 system must be installed and tested according to the SLC 500 Fixed Hardware Style Installation & Operation Manual (publication 1747-6.21) or the SLC 500 Modular Hardware Style User Manual (publication 1747-UM011).
  • Page 59 Testing Your Module To test the analog inputs follow these steps: 1. Determine the boundary conditions for the analog module input channel. For example, if the input channel is connected to a sensor that has an output range of 1 mA to 5 mA, the boundary conditions would be 1 mA (lower) and 5 mA (upper).

  • Page 60: Testing Analog Outputs

    Testing Your Module 10. Repeat steps 1 through 8 for the remaining analog inputs. 11. If any of the analog input channels do not pass the start–up procedure, check for the following potential causes: • The processor is not in the TEST/CONTINUOUS scan mode. •...
  • Page 61 Testing Your Module device, properly configured, and must have no rungs in its ladder program. The analog module LED must be illuminated. The procedure described in this section for testing ATTENTION analog module output channels assumes that all I/O module outputs that normally activate prime movers or other potentially dangerous devices have been disconnected from these devices.
  • Page 62 Testing Your Module 3. Create and save the test rung shown below. MOVE Source N7:0 Dest O:e.x "e" is the slot number of the analog module "x" is the number of the analog module output channel being tested 4. Download the program to the processor and enter the RUN mode.

  • Page 63: Addressing, Out-Of-Range Detection, And Scaling Of Analog

    Chapter Programming Examples This chapter shows several programming examples that provide additional capabilities such as: • Addressing, Out-of-Range Detection, and Scaling of Analog Inputs • Addressing and Scaling of Analog Outputs • Scaling Offsets when > 32,767 or < -32,768 •...

  • Page 64: Calculating The Linear Relationship

    Programming Examples The scaling operation is displayed in the following graph. It displays the linear relationship between the input and the resulting scaled values. 500°C (Scaled max.) Scaled Value 300°C Process operating range 275°C 100°C (Scaled min.) 0=0V dc High 32767 = 10V dc –...

  • Page 65: Calculating The Out-Of-Range Flag Using The Scale Instruction

    Programming Examples Calculating the Out-of-Range Flag Using the Scale Instruction Use the following equation to calculate the low and high limit input values which determine the out-of-range flag. Input value = (scaled value - offset) / slope low limit (275 - 100) / (400/32,767) = 14,344 high limit (300 - 100) / (400/32,767) = 16,393 Once you have calculated the linear relationship and the out-of-range flag value, this example allows you to:...

  • Page 66: Using Standard Math

    Programming Examples Using Standard Math Rung 2:0 Check for below allowable range Below range flag | | +LES–––––––––––––––+ |–+LESS THAN +–––––––––––––––––––––––––––––––––––––––––––––––––( )–––––| | |Source A I:1.1| | |Source B 14344| | +––––––––––––––––––+ Rung 2:1 Check for above allowable range Above range flag | | +GRT–––––––––––––––+ |–+GREATER THAN...
  • Page 67 Programming Examples Rung 2:4 Scale the analog input value and process the result only when it is within the acceptible range | Below |Above Multiply | range flag|range flag by the scaled range +MUL–––––––––––––––+ |––––]/[––––––––]/[–––––––––––––––––––––––––––––––––––+–+MULTIPLY +–+–| | |Source A I:1.1| | | | | | | |Source B 400| | |...

  • Page 68: Using The Scale (Scl) Instruction

    Programming Examples Using the Scale (SCL) Instruction Rung 2:0 Check for below allowable range. Below range flag | | +LES–––––––––––––––+ |–+LESS THAN +–––––––––––––––––––––––––––––––––––––––––––––––––( )–––––| | |Source A I:1.1| | |Source B 14344| | +––––––––––––––––––+ Rung 2:1 Check for above allowable range. Above range flag | +GRT–––––––––––––––+...

  • Page 69: Using Scale With Parameters (Scp) Instruction

    Programming Examples Using Scale with Parameters (SCP) Instruction Rung 2:0 Check for below allowable range. Below range flag | +LES–––––––––––––––+ |–+LESS THAN +–––––––––––––––––––––––––––––––––––––––––––––––––( )–––––| | |Source A I:1.1| | |Source B 14344| | +––––––––––––––––––+ Rung 2:1 Check for above allowable range. Above range flag | +GRT–––––––––––––––+...

  • Page 70: Addressing And Scaling Outputs

    Programming Examples Addressing and Scaling We are making the following assumptions: Outputs • The NIO4I is located in slot 2 of a SLC 500 system. • An actuator from a flow control valve is wired to output channel • The actuator accepts a 4 mA to 20 mA signal proportional to 0 to 100% of the valve’s opening.
  • Page 71 Programming Examples The out-of-range limits are predetermined because any value less than 0% is 6,242 and any value greater than 100% is 31,208. The ladder logic checks for the out-of-range flag to verify that not less than 4 mA and not more than 20 mA is provided out of the analog output channel.

  • Page 72: Using Standard Math

    6-10 Programming Examples Using Standard Math Rung 2:0 N7:0 contains percentage of valve open. If this value is less than 0, move the minimum value to the analog output (6242 decimal = 4 mA at the analog output). Check for Below below range flag...
  • Page 73 Programming Examples 6-11 Rung 2:2 Scale values in the 0 to 100% range to the decimal range for the 4–20 mA analog output. | Below |Above Mulitply | range flag|range flag by scaled range +MUL–––––––––––––––+ |––––]/[––––––––]/[–––––––––––––––––––––––––––––––––––+–+MULTIPLY +–+–| | |Source A N7:0| | | 0| | | | |Source B...

  • Page 74: Using The Scale With Parameters (Scp) Instruction

    6-12 Programming Examples Using the Scale with Parameters (SCP) Instruction Rung 2:0 N7:0 contains percentage of valve open. If this value is less than 0, move the minimum value to the analog output (6242 decimal = 4 mA at the analog output). Check for Below below...
  • Page 75 Programming Examples 6-13 Rung 2:2 Scale values in the 0 to 100% range to the decimal range for the 4–20 mA analog output. | Below |Above | range flag|range flag +SCP––––––––––––––––––––+ | |––––]/[––––––––]/[––––––––––––––––––––––––––––––––––+SCALE W/PARAMETERS +–| |Input N7:0| | 0| | |Input Min.

  • Page 76: Scaling Offset When > 32,767 Or < -32,768

    6-14 Programming Examples Scaling Offset when There may be applications when the offset value put into standard math instructions is greater than 32,767 or less than -32,768. In these > 32,767 or < -32,768 cases, it is easier to shift the linear relationship along the input value axis and reduce the values.

  • Page 77: Calculating The Shifted Linear Relationship

    Programming Examples 6-15 The following graph shows the shifted linear relationship. Notice that the resulting offset value is reduced. 20 mA = 31208 (scaled max.) Scaled Value 4 mA = 6242 (scaled min.) 100% (input min.) (input max.) Input Value Calculating the Shifted Linear Relationship Use the following equations to recalculate the linear relationship: Scaled value = ((input value - input min.) x slope)) + offset...

  • Page 78: Using Standard Math

    6-16 Programming Examples Using Standard Math Rung 2:0 N7:0 contains the percentage of the valve open. Check for below range | +LES–––––––––––––––+ |–+LESS THAN +––––––––––––––––––––––––––––––––+––( )–––––––––––––––––+–| | |Source A N7:0| | |Source B | +––––––––––––––––––+ | +MOV–––––––––––––––+ | | +–+MOVE +–+ | |Source 6242|...
  • Page 79 Programming Examples 6-17 Rung 2:2 Scale values in the 90–100% range to the decimal range for the 4–20 mA analog output. Subtract the input min. +SUB–––––––––––––––+ |––––]/[––––––––]/[–––––––––––––––––––––––––––––––––––+–+SUBTRACT +–+–| | |Source A N7:0| | | 0| | | | |Source B 90| | | | | | | |Dest...

  • Page 80: Using The Scale With Parameters (Scp) Instruction

    6-18 Programming Examples Using the Scale with Parameters (SCP) Instruction Rung 2:0 N7:0 contains percentage of valve open. If this value is less than 90, move the minimum value to the analog output (6242 decimal = 4 mA at the analog output). Check for Below below...
  • Page 81 Programming Examples 6-19 Rung 2:2 Scale values in the 90 to 100% range to the decimal range for the 4–20 mA analog output. | Below |Above Scale for the analog output | range flag|range flag +SCP––––––––––––––––––––+ | |––––]/[––––––––]/[––––––––––––––––––––––––––––––––––+SCALE W/PARAMETERS +–| |Input N7:0| | 0| |...

  • Page 82: Scaling And Range Checking And Analog Inputs And Outputs

    6-20 Programming Examples Scaling and Range This example demonstrates the addressing of analog I/O and the scaling and range checking of analog input and output values. An Checking and Analog NIO4V is placed in slot 1 of an SLC 500 system. A 0 to 200 psi Inputs and Outputs pressure sensor is input as a 4 mA to 20 mA signal to input channel 0.

  • Page 83: Calculating The Linear Relationship

    Programming Examples 6-21 Calculating the Linear Relationship Use the following equations to express the linear relationship between the input value and the resulting scaled value: Scaled value = (input value x slope) + offset Slope = (scaled max. - scaled min.) / (input max. - input min.) (8192 - 0) / (16384 - 3277) = 8192/13107 Offset = scaled min.

  • Page 84: Using Standard Math Instructions

    6-22 Programming Examples Using Standard Math Instructions Rung 2:0 Check for below range. | +LES–––––––––––––––+ |–+LESS THAN +––––––––––––––––––––––––––––––––+––( )–––––––––––––––––+–| | |Source A I:1.0| | |Source B 3277| | +––––––––––––––––––+ | +MOV–––––––––––––––+ | | +–+MOVE +–+ | |Source |Dest O:1.0| +––––––––––––––––––+ Ladder logic continued on the next page.
  • Page 85 Programming Examples 6-23 Rung 2:1 Check for above range. | +GRT–––––––––––––––+ |–+GREATER THAN +––––––––––––––––––––––––––––––––+––( )–––––––––––––––––+–| | |Source A I:1.0| | |Source B 16384| | +––––––––––––––––––+ | +MOV–––––––––––––––+ | | +–+MOVE +–+ | |Source 8192| |Dest O:1.0| +––––––––––––––––––+ Rung 2:2 Scale the analog input for the analog output. Multiply by the scaled range...

  • Page 86: Scaling And Range Checking Of Analog Inputs And Outputs

    6-24 Programming Examples Scaling and Range The scaling instruction available in the SLC 5/02 processor is used to realize a more efficient program. The scaling instruction uses the same Checking of Analog Inputs multiply, divide and add algorithm but it does so with a single rate and Outputs instead of the scaled range and input range values.

  • Page 87: Using Scl Instruction

    Programming Examples 6-25 Using SCL Instruction Rung 2:0 Check for below range. | +LES–––––––––––––––+ |–+LESS THAN +––––––––––––––––––––––––––––––––+––( )–––––––––––––––––+–| | |Source A I:1.0| | |Source B 3277| | +––––––––––––––––––+ | +MOV–––––––––––––––+ | | +–+MOVE +–+ | |Source |Dest O:1.0| +––––––––––––––––––+ Rung 2:1 Check for above range.

  • Page 88: Using The Scale With Parameters (Scp) Instruction

    6-26 Programming Examples Using the Scale with Parameters (SCP) Instruction Rung 2:0 Check for below range. | +LES–––––––––––––––+ |–+LESS THAN +––––––––––––––––––––––––––––––––+––( )–––––––––––––––––+–| | |Source A I:1.0| | |Source B 3277| | +––––––––––––––––––+ | +MOV–––––––––––––––+ | | +–+MOVE +–+ | |Source |Dest O:1.0| +––––––––––––––––––+...

  • Page 89: Preventative Maintenance

    Chapter Maintenance and Safety Preventative Maintenance This chapter provides preventive maintenance information and safety considerations when troubleshooting your SLC 500 system. The printed circuit boards of the analog modules must be protected from dirt, oil, moisture and other airborne contaminants. To protect these boards, the SLC 500 system must be installed in an enclosure suitable for the environment.

  • Page 90: Safety Considerations When Troubleshooting

    Maintenance and Safety Safety Considerations The following section describes several safety areas you should be aware of when troubleshooting your SLC 500 system. When Troubleshooting Indicator Lights - When the red LED on the analog module is illuminated it indicates that 24V dc power is applied to the module. Activating Devices When Troubleshooting - When troubleshooting, never reach into the machine to actuate a device.

  • Page 91: Analog Modules Specification

    Appendix Specifications Analog Modules This section lists the specifications for the 1746-NI4, NIO4I, NIO4V, NO4I and NO4V analog modules. They include: Specification • General specifications • Current and Voltage input specifications • Current and Voltage output specifications General Specifications for NI4, NIO4I, NIO4V, NO4I, Specification Value...

  • Page 92: Nio4V

    Specifications General Analog Input Catalog 1746- Input Channels per Output Channels per Backplane Current Draw External 24V dc Power Module Module Supply Tolerance 5V (max.) 24V (max.) 4 differential, voltage or 35 mA 85 mA current selectable per channel, not individually isolated NIO4I 2 differential, voltage or...

  • Page 93: Current-Loop Input Specifications For Ni4, Nio4I, And Nio4V

    Specifications Current-Loop Input Specifications for NI4, Specification 1746-NI4, -NI04I, -NIO4V NIO4I, and NIO4V Input Range (Normal Operation) -20 to +20 mA Absolute Maximum Input Current -30 to +30 mA Absolute Maximum Input Voltage ±7.5V dc or 7.5V ac RMS Current Input Coding -20 to +20 mA -16,384 to +16,384 Input Impedance 250 Ohms...

  • Page 94: Voltage Input Specifications For Ni4, Nio4I, And Nio4V

    Specifications Voltage Input Specifications for NI4, NIO4I, and NIO4V Specification 1746-NI4 1746-NI04I, -NI04V Input Range -10 to +10V dc - 1 LSB Voltage Input Coding (-10 to +10V dc - 1 LSB) -32,768 to +32,767 Input Impedance 1M ohms 760K ohms Resolution 305.176 µV per LSB Full Scale...

  • Page 95: Current Output Specifications For Nio4I And No4I

    Specifications Current Output Specifications for NIO4I Specification 1746-NI04I, -N04I and NO4I Converter Resolution 14 bit Location of LSB in I/O image word 0000 0000 0000 01XX Non–linearity 0.05% Conversion Method R-2R Ladder Step Response 2.5 ms (at 95%) Load Range 0 to 500 Ohms Maximum Load Reactance 100 µH...

  • Page 96: Voltage Output Specifications For Nio4V And No4V

    Specifications Voltage Output Specifications for NIO4V Specification 1746--NIO4V, -N04V and NO4V Converter Resolution 14 bit Location of LSB in I/O image word 0000 0000 0000 01XX Non–linearity 0.05% Conversion Method R-2R Ladder Step Response 2.5 ms (at 95%) 1K to ∞ Ohms Load Range Maximum Load Current 10 mA...

  • Page 97: Positive Decimal Values

    Appendix Two’s Complement Binary Numbers The SLC 500 processor memory stores 16-bit binary numbers. Two’s complement binary is used when performing mathematical calculations internal to the processor. Analog input values from the analog modules are returned to the processor in 16-bit two’s complement binary format.

  • Page 98: Negative Decimal Values

    Two’s Complement Binary Numbers 14 = 16384 16384 13 = 8192 8192 12 = 4096 4096 11 = 2048 2048 10 = 1024 1024 32767 15 = This position is always zero for positive numbers Negative Decimal Values In two’s complement notation, the far left position is always 1 for negative values.
  • Page 99 Two’s Complement Binary Numbers 14 = 16384 16384 13 = 8192 8192 12 = 4096 4096 11 = 2048 2048 10 = 1024 1024 32767 15 = This position is always 1 for negative numbers Publication 1746-UM005B-EN-P - June 2004...
  • Page 100 Two’s Complement Binary Numbers Publication 1746-UM005B-EN-P - June 2004...

  • Page 101: Calibrating An Analog Input Channel

    Appendix Optional Analog Input Software Calibration This appendix helps you calibrate an analog input channel using software offsets to increase the expected accuracy of an analog input circuit. Examples of equations and a ladder diagram are provided for your reference. A software calibration reduces the offset error and gain error at a given temperature by scaling the values read at calibration time.

  • Page 102: Calculating The Software Calibration

    Optional Analog Input Software Calibration 20 mA = 16384 (scale Hi) Scaled Value 4 mA = 3277 (scale low) 3267 16396 Low Value from card Hi Value from card Input Value Scaled Value vs. Input Value Calculating the Software Calibration Use the following equation to perform the software calibration: Scaled Value = (input value x slope) + offset Slope = (scaled max.
  • Page 103 Optional Analog Input Software Calibration 4. Using an analog input calibration source or your system’s input device placed at the 20 mA position, capture the high value by energizing the calibrate high input. Ensure that your high value lies within the conversion range of your analog input. 5.
  • Page 104 Optional Analog Input Software Calibration Example Ladder Diagram The following ladder diagram requires 3 external inputs that are used to perform the calibration procedure. Lo causes the ladder to capture the 4 mA calibration value and Hi causes the ladder to capture the 20 mA calibration value.
  • Page 105 Optional Analog Input Software Calibration Rung 2:0 | Cal_Lo N10:0 +MOV---------------+ | |----] [------[OSR]---------------------------------------+MOVE |Source ANALOG_IN| | 8000| | |Dest LO_VALUE| | 3267| | +------------------+ | Rung 2:1 | Cal_Hi N10:0 +MOV---------------+ | |----] [------[OSR]---------------------------------------+MOVE |Source ANALOG_IN| | 8000| | |Dest HI_VALUE| | 16396| |...
  • Page 106 Optional Analog Input Software Calibration | +MUL--------------------+ | | +-+MULTIPLY +-+ | | |Source A LO_VALUE| | | 3267| | | | |Source B SLOPE_X10K| | | 9983| | | | |Dest N10:5| | | 32767| | | | +-----------------------+ | | | +DDV---------------+ +-+DOUBLE DIVIDE +------+ |...
  • Page 107 Modules 0.022 µF – > VOL TAGE from > 1 µF > ANL COM Negative Voltage Supply Current Output Circuit for 1746-NIO4I Modules 1 µF – from > > CURRENT 0.1 µF > ANL COM Publication 1746-UM005B-EN-P - June 2004...
  • Page 108 Module Input and Output Circuits Isolation Rating 500V dc Circuit for Current Input 500KΩ 500KΩ – 250Ω Transfomer Isolation 500KΩ ANL COM DC-DC Rectifier Converter Filter and Primary Regulation Circuit for Voltage Input 500KΩ 500KΩ Optical – Isolation A to D Converter 500KΩ...
  • Page 109 Index Numerics Converting Analog Input Data Converting Analog Output Data 1746-N04I and N04V Analog Output Current Output Circuit for 1746NIO4I Modules Modules 1746-NI04I and NI04V Analog Combination Modules 1746-NI4 Analog Input Module Disconnect Prime Movers Addressing Analog Modules Addressing and Scaling Outputs equipment needed Calculating the Linear Relationship 6-10...
  • Page 110 Index 6-14 Positive Decimal Values Calculating the Linear Relationship Calculating the Linear Shifted power requirements for a fixed 6-15 Relationship controller 6-16 Using Standard Math power requirements for a modular Using the Scale with Parameters (SCP) controller 6-18 Instruction PowerUp the SLC 500 System startup instructions Processor Update of Analog Data system start-up procedures...
  • Page 111 Index Publication 1746-UM005B-EN-P - June 2004...
  • Page 113 Please contact your local Rockwell Automation representative for States return procedure. Allen-Bradley is a registered trademark of Rockwell Automation. SLC and DTAM are trademarks of Rockwell Automation. Belden is a trademark of Belden, Inc. C-UL is a registered trademark of Underwriters Laboratories.

This manual is also suitable for:

Slc 5001746-nio4v1746-no4i1746-ni41746-no4v

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