Rockwell Automation 1756-OF8I User Manual

User Manual

ControlLogix Eight-channel Isolated Analog I/O Modules

Catalog Numbers 1756-IF8I, 1756-IRT8I, 1756-OF8I

Important User Information

IMPORTANT

Read this document and the documents listed in the additional resources section about installation, configuration, and operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.

Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to be carried out by suitably trained personnel in accordance with applicable code of practice.

If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited.

Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.

Identifies information that is critical for successful application and understanding of the product.

Labels may also be on or inside the equipment to provide specific precautions.

SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may be present.

BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach dangerous temperatures.

ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE).

Allen-Bradley, ControlLogix, Integrated Architecture, Logix Designer, Logix5000, Rockwell Software, Rockwell Automation, RSLogix, Studio 5000, an d Studio 5000 Log ix Designer are trademarks of Rockwell Automation, Inc.

Trademarks not belonging to Rockwell Automation are property of their respective companies.

Preface

Isolated Analog I/O Module Operation in the ControlLogix System

ControlLogix Isolated Analog I/O Module Features

Studio 5000 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Chapter 1

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Ownership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Configure a Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Direct Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Input Module Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Requested Packet Interval (RPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Input Modules in a Local Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Input Modules in a Remote Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Triggering Event Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Output Module Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Output Modules in a Local Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Output Modules in a Remote Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Listen-only Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Chapter 2

Common Analog I/O Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

CIP Sync Timestamp of Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Rolling Timestamp of Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Floating Point Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Module Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Module Quality Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Fault and Status Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Configurable Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Latching of Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Module Inhibiting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Electronic Keying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Exact Match . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Compatible Keying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Disabled Keying. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Relationship between Module Resolution and Scaling. . . . . . . . . . . . . . . 35

Module Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Scaling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Calibrated Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Calibrated Accuracy at 25 °C (77 °F). . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Module Error over Full Temperature Range . . . . . . . . . . . . . . . . . . . . 39

Error Calculated over Hardware Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Rockwell Automation Publication 1756-UM540A-EN-P - May 2014 3

Table of Contents

RTD and Thermocouple Error Calculations. . . . . . . . . . . . . . . . . . . . . . . . 39

RTD Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Thermocouple Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Module Error at 25 °C (77 °F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Thermocouple Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Chapter 3 1756-IF8I Isolated Analog Input Module

1756-IRT8I Combined Temperature-sensing Isolated Analog Module

1756-IF8I Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Internal Loop Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Multiple Input Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Notch Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Underrange/Overrange Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Digital Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Process Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Rate Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Sensor Offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Wire Off Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Synchronized Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Module Block and Circuit Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Field-side Circuit Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Wire the 1756-IF8I Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Fault and Status Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Chapter 4

1756-IRT8I Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Multiple Input Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Notch Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Underrange/Overrange Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Digital Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Process Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Rate Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Sensor Offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

10 Ohm Copper Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Wire Off Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Temperature Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Sensor Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Thermocouple Wire Length Compensation . . . . . . . . . . . . . . . . . . . . 81

Synchronized Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Module Block and Circuit Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Field-side Circuit Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Wire the 1756-IRT8I Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Fault and Status Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

4 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014

Chapter 5

Table of Contents

1756-OF8I Isolated Analog Output Module

Install ControlLogix Isolated Analog I/O Modules

1756-OF8I Module Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Multiple Output Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Channel Offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Ramping/Rate Limiting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Hold for Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Clamping/Limiting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Clamp/Limit Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Data Echo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Module Block and Output Circuit Diagrams . . . . . . . . . . . . . . . . . . . . . . . 98

Field-side Circuit Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Drive Different Loads

with the 1756-OF8I Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Wire the 1756-OF8I Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Fault and Status Reporting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Chapter 6

Install the I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Key the Removable Terminal Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Connect Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Connect the Grounded End of the Cable. . . . . . . . . . . . . . . . . . . . . . 110

Connect the Ungrounded End of the Cable . . . . . . . . . . . . . . . . . . . 111

RTB Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

RTB Wiring Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Assemble the RTB and the Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Choose Extended-depth Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Cabinet Size Considerations with Extended-depth Housing . . . . 116

Install the Removable Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Remove the Removable Terminal Block. . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Remove the Module from the Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Configure ControlLogix Isolated AnalogI/O Modules

Chapter 7

Create a New Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Module Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Edit the Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Connection Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Configuration Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Calibration Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Alarm Configuration Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

CJ Configuration Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Limit Configuration Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Copy Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

View the Module Tags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Rockwell Automation Publication 1756-UM540A-EN-P - May 2014 5

Table of Contents

Chapter 8 Calibrate the ControlLogix Isolated Analog I/O Modules

Troubleshoot Your Module

Difference between Calibrating an Input Module and

an Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Calibrate in Program Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Calibrate the Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Calibrate the 1756-IF8I Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Calibrate the 1756-IRT8I Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Calibrate the Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Calibrate the 1756-OF8I Module for a Current Output Type . . . 152

Chapter 9

Status Indicators for the 1756-IF8I Module . . . . . . . . . . . . . . . . . . . . . . . 157

Status Indicators for the 1756-IRT8I Module. . . . . . . . . . . . . . . . . . . . . . 158

Status Indicators for the 1756-OF8I Module . . . . . . . . . . . . . . . . . . . . . . 159

Use Logix Designer Application for Troubleshooting. . . . . . . . . . . . . . . 160

Troubleshoot Incorrect Readings on the Module. . . . . . . . . . . . . . . . . . . 162

1756-IRT8I Module - Incorrect Temperature Readings. . . . . . . . . 162

1756-IRT8I Module - Incorrect RTD Readings . . . . . . . . . . . . . . . . 165

1756-IF8I Module - Incorrect Input Voltage/Current Readings . 168 1756-OF8I Module - Incorrect Output Voltage/Current

Readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Isolated Analog I/O Module Tag Definitions

Choose the Correct Power Supply

1492 Analog Interface Modules

Appendix A

Access the Tags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

1756-IF8I Module Tags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Configuration Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Input Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Output Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

1756-IRT8I Module Tags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Configuration Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Input Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Output Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189

1756-OF8I Module Tags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Configuration Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Input Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Output Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

Appendix B

Power-sizing Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199

Appendix C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Index

6 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

Preface

This manual describes how to install, configure, and troubleshoot your ControlLogix® isolated analog I/O module.

You must be able to program and operate a ControlLogix controller to efficiently use your isolated analog I/O modules. If you need additional information, refer to Additional Resources on page 8

ControlLogix isolated analog I/O modules convert analog signals to digital values for inputs and convert digital values to analog signals for outputs. Controllers use these signals for control purposes.

By using the producer/consumer network model, ControlLogix isolated analog I/O modules produce information when needed while providing additional system functions.

Studio 5000 Environment

The Studio 5000® Engineering and Design Environment combines engineering and design elements into a common environment. The first element in the Studio 5000 environment is the Logix Designer application. The Logix Designer

application is the rebranding of RSLogix product to program Logix5000

safety, and drive-based solutions.

™ controllers for discrete, process, batch, motion,

™ 5000 software and continue to be the

The Studio 5000 environment is the foundation for the future of Rockwell Automation® engineering design tools and capabilities. It is the one place for design engineers to develop all the elements of their control system.

Rockwell Automation Publication 1756-UM540A-EN-P - May 2014 7

Preface

IMPORTANT

In addition to the Studio 5000 Logix Designer™ application, version 21 or later, you can use your ControlLogix isolated analog I/O modules in RSLogix 5000 software, versions 18…20, projects.

You must install Add-on Profiles (AOP) to use the modules in any Logix Designer application or RSLogix 5000 software project.

This publication describes configuration with Logix Designer application.

Some of the tasks that are described in this publication by using the Logix Designer application have slightly different screens when completed by using RSLogix 5000 software. The procedure order required to complete the tasks is primarily the same regardless of the programming application used to do so.

Additional Resources

These documents contain additional information concerning related products

from Rockwell Automation.

Resource Documentation

1756 ControlLogix I/O Specifications, publication

1756-TD002

ControlLogix Digital I/O Modules User Manual, publication 1756-UM058

1756 ControlLogix Chassis and Power Supplies Installation Instructions, publication

1756-IN005

Integrated Architecture and CIP Sync Configuration Application Technique, publication IA-AT003

ControlLogix System User Manual, publication

1756 UM001

Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1

Product Certifications website, http://

www.ab.com

Provides specifications for ControlLogix analog and digital I/O modules as well as the accessories that can be used with each.

Provides information on how to install, configure, and troubleshoot ControlLogix digital I/O modules.

Provides information on how to install a wide range o f ControlLogix chassis, power supplies, and chassis adapter modules.

Describes how to configure CIP Sync with Integrated Architecture™ products and applications.

Describes how to install, configure, program, and operate a ControlLogix system.

Provides general guidelines for installing a Rockwell Automation industrial system.

Provides declarations of conformity, certificates, and other certification details.

You can view or download Rockwell Automation publications at http:/

www.rockwellautomation.com/literature/.

To order paper copies of technical documentation, contact your local

Allen-Bradley distributor or Rockwell Automation sales representative.

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Chapter 1

Isolated Analog I/O Module Operation in the ControlLogix System

Top ic Pag e

Before You Begin 9

Ownership 11

Configure a Module 11

Direct Connections 12

Input Module Operation 14

Output Module Operation 17

Listen-only Mode 18

Before You Begin

ControlLogix controllers use isolated analog I/O modules to control devices in a ControlLogix control system. The modules are installed in a ControlLogix chassis and use a removable terminal block (RTB) or a Bulletin 1492 interface

(1)

module

cable to connect to field-side wiring.

The modules use the producer/consumer network communication model. This communication is an intelligent data exchange between modules and other system devices in which each module produces data without first being polled.

Before you install and use your module, complete the following tasks:

(2)

• Install and ground a 1756 ControlLogix chassis and power supply

. You

can use a standard power supply or a redundant power supply.

For more information on installing 1756 ControlLogix chassis and power supplies, see Additional Resources on page 8

(1) The ControlLogix system has been agency certified using only the ControlLogix RTBs (catalog numbers 1756-TBCH, 1756-TBNH,

1756-TBSH and 1756-TBS6H). Any application that requires agency certification of the ControlLogix system using other wiring termination methods can require application specific approval by the cert ifying agency.

(2) In addition to standard ControlLogix power supplies, ControlLogix Redundant Power Supplies are also available for your application.

For more information on these supplies, see the ControlLogix Selection Guide, publication 1756-SG001 distributor or Rockwell Automation representative.

Rockwell Automation Publication 1756-UM540A-EN-P - May 2014 9

, or contact your local

Chapter 1 Isolated Analog I/O Module Operation in the ControlLogix System

IMPORTANT

Removable Terminal Block

• Verify that you have an RTB or IFM and its components.

Table 1 - Types of ControlLogix Isolated Analog I/O Modules

Cat. No. Description RTB Used Page

1756-IF8I 8-point general purpose isolated analog

1756-IRT8I 8-point isolated combined temperature and mV

1756-OF8I 8-point general purpose isolated analog

Figure 1 - Parts Illustration of the ControlLogix Isolated Analog I/O Module

RTBs and IFMs are not included with your module purchase.

current/voltage input module

sensing input module

current/voltage output module

36-pin

(1756-TBCH or

1756-TBS6H)

Item Description

1 Backplane connector - Interface for the ControlLogix system that connects the module to the backplane.

2 Top and bottom guides - Guides provide assistance in seating the RTB or IFM cable onto the module.

3 Status indicators - Indicators display the status of communication, module health, and input/output

4 Connectors pins - Input/output, power, and grounding connections are made to the module through

5 Locking tab - The locking tab anchors the RTB or IFM cable on the module, maintaining wiring

6 Slots for keying - Mechanically keys the RTB to prevent inadvertently making the wrong wire connections

10 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014

devices. Indicators help in troubleshooting anomalies.

these pins with the use of an RTB or IFM.

connections.

to your module.

Isolated Analog I/O Module Operation in the ControlLogix System Chapter 1

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Controller I/O Modules

Ownership

Configure a Module

Every I/O module in the ControlLogix system must be owned by a ControlLogix controller. This controller performs the following:

• Stores configuration data for every module that it owns.

• Resides in the local or remote chassis in regard to the I/O

module’s position.

• Sends the I/O module configuration data to define the module’s behavior and begin operation in the control system.

Each ControlLogix I/O module must continuously maintain communication with its owner to operate normally. Typically, each module in the system has only one owner. Input modules can have more than one owner. Output modules, however, are limited to a single owner.

You use the I/O configuration portion of the Logix Designer application to configure each I/O module. An I/O module can reside in either of the following:

•Local chassis - The chassis in which the owner-controller resides.

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Chapter 1 Isolated Analog I/O Module Operation in the ControlLogix System

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Control ler I/O Modules

Local Chassis Remote Chassis

EtherNet/IP Network

IMPORTANT

•Remote chassis - A chassis that does not contain the module’s ownercontroller but is connected to the local chassis over the EtherNet/IP network or ControlNet network.

Direct Connections

The Logix Designer application transfers configuration data to the controller during the program download. Subsequently, data is transferred to the I/O modules in the local and remote chassis.

The I/O module can operate immediately after the project download from the owner-controller is complete.

A direct connection is a real-time data transfer link between the controller and the device that occupies the slot that the configuration references.

ControlLogix isolated analog I/O modules support only direct connections

When you download module configuration to a controller, the controller attempts to establish a direct connection to each module referenced by the configuration.

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Isolated Analog I/O Module Operation in the ControlLogix System Chapter 1

If controller configuration refers to a chassis slot in the system, the controller periodically checks for the presence of a device there. If a device is detected, the controller sends the configuration, and one of the following occurs:

• If the configuration is appropriate to the module detected, a connection is made and operation begins.

• If the configuration is not appropriate to the module detected, the data is rejected and the Logix Designer application indicates that an error occurred.

The configuration can be inappropriate for any of a number of reasons. For example, a module’s configuration can include a mismatch in electronic keying that prevents normal operation.

The controller maintains and monitors its connection with a module. Any break in the connection, for example, the removal of the module from the chassis while under power, causes a fault.

The Logix Designer application indicates that the fault occurred in the fault status bits associated with the module. The Logix Designer application monitors the fault status bits to annunciate the module’s failures.

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Chapter 1 Isolated Analog I/O Module Operation in the ControlLogix System

IMPORTANT

On-Board Memory

Status Data

Channel Data

Ch 0

Ch 1

Ch 2

Ch 3

Ch 4

Ch 5

Timestamp

Channel Data

Channel Data Ch 6

Ch 7

Input Module Operation

In traditional I/O systems, controllers periodically poll input modules to obtain their input status.

In the ControlLogix system, the controller does not poll the isolated analog input modules. Instead, the modules broadcast their input data, that is, channel and status data, to their backplane periodically.

Requested Packet Interval (RPI)

The RPI is a configurable parameter that defines a specific period of time at which the module broadcasts input data to the backplane. Valid RPI values are 1…750 ms. The default value is 100 ms.

You set the RPI value at initial module configuration and adjust it as necessary only when the controller is in Program mode.

Other ControlLogix analog input modules offer the Real Time Sample (RTS) parameter that determines when channel data is scanned and stored on the module’s on-board memory until broadcast to the chassis backplane.

The 1756-IF8I and 1756-IRT8I modules do not offer the RTS parameter. With these modules, the channel sampling rate is exclusively determined by the RPI value.

At the RPI, the following events occur.

1. The module scans its channels for input data.

2. The module broadcasts the data to its backplane.

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Isolated Analog I/O Module Operation in the ControlLogix System Chapter 1

The input module broadcasts data to the chassis backplane immediately after the scan:

• When the module resides in the local chassis, the controller receives the data immediately.

• When the module resides in a remote chassis, the time elapsed before the controller receives it depends on the configuration of the network connecting the local and remote chassis.

For more information, see Input Modules in a Remote Chassis

Input Modules in a Local Chassis

When an input module resides in a local chassis, as shown on page 11, after the input module broadcasts data to the chassis backplane, the controller receives it immediately.

Input Modules in a Remote Chassis

When an input module resides in a remote chassis, as shown on page 12, it is considered remote input module.

At the RPI, the following events occur.

1. The remote input module scans its channels for input data.

2. The remote input module broadcasts the data to its backplane.

3. The network communication module in the chassis with the I/O module

sends the data over the network to the controller.

Broadcast Method

The isolated analog input module broadcasts data by using one of the following connection methods:

• Multicast - Data is sent to all network devices

• Unicast - Data is sent to a specific controller depending on the

module’s configuration

For more information on guidelines for specifying RPI rates, see the Logix5000 Controllers Design Considerations Reference Manual, publication

1756-RM094

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Chapter 1 Isolated Analog I/O Module Operation in the ControlLogix System

Triggering Event Tasks

ControlLogix isolated analog input modules can trigger an Event task. The Event task causes the controller to execute a section of logic immediately when a triggering event occurs. You can configure the Event task to be triggered if new input data is sent at the RPI.

The following graphic shows an Event task dialog box in Logix Designer application.

Event tasks are useful for synchronizing process variable (PV) samples and proportional integral derivative (PID) calculations.

For more information on Event tasks, see the Logix5000 Controllers Tasks, Programs, and Routines Programming Manual, publication 1756-PM005

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Isolated Analog I/O Module Operation in the ControlLogix System Chapter 1

Output Module Operation

The RPI defines when a controller sends data to the isolated analog output module and when the output module echoes data. The controller sends data to an output module only at the RPI.

When an output module receives new data from the controller, the module multicasts or ‘echoes’ a data value that corresponds to the signal present at its terminals to the rest of the control system. This feature, called Data Echo whether the output module resides in the local or remote chassis.

Depending on the value of the RPI, with respect to the length of the controller program scan, the output module can receive and ‘echo’ data multiple times during one program scan.

When the RPI is less than the program scan length, the module’s output channels can change values multiple times during a single program scan. The controller does not depend on reaching the end of the program to send data.

, occurs

Output Modules in a Local Chassis

When an output module resides in a local chassis, as shown on page 11, it receives data almost immediately after the owner-controller sends it.

Output Modules in a Remote Chassis

When an output module resides in a remote chassis, as shown on page 12, and is connected to the local chassis via an EtherNet/IP network, the following events occur for the controller to send data to the output module.

1. The controller broadcasts data to its local chassis at one of the following events:

• RPI value

• A programmed Immediate Output (IOT) instruction is executed.

An IOT sends data immediately and resets the RPI timer.

2. The 1756 ControlLogix EtherNet/IP communication module in the local chassis broadcasts the data over the EtherNet/IP network.

3. After receiving the output data, the 1756 ControlLogix EtherNet/IP communication in the remote chassis broadcasts the data to its backplane, that is, the remote chassis.

4. The output module receives the data almost immediately after it is broadcast to the remote chassis backplane.

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Chapter 1 Isolated Analog I/O Module Operation in the ControlLogix System

IMPORTANT

Listen-only Mode

Any controller in the system can listen to the data from any I/O module, that is, input data or ‘echoed’ output data, even if the controller does not own the module.

During the I/O configuration process, you can specify a ‘Listen-Only’ connection. For more information on Connection options when configuring your system, see page 125

When you choose a ‘Listen-Only’ connection, the controller and module establish communication without the controller sending configuration data. In this instance, another controller owns the I/O module.

If any controller uses a ‘Listen-Only’ connection to the module, none of the other connections over the EtherNet/IP network can use the Unicast option.

The ‘Listen-Only’ controller receives multicast data from the I/O module as long as a connection between a controller and I/O module is maintained

If the connection between all owner-controllers and the module is broken, the module stops multicasting data and connections to all ‘Listening controllers’ are also broken.

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ControlLogix Isolated Analog I/O Module Features

Top ic Pa ge

Common Analog I/O Features 20

Relationship between Module Resolution and Scaling 35

Calibrati on 38

Calibrated Accuracy 38

Error Calculated over Hardware Range 39

RTD and Thermocouple Error Calculations 39

Thermocouple Resolution 43

Chapter 2

ControlLogix isolated analog input modules convert an analog signal to a digital value. The following are example analog signal types to which input modules convert to digital values:

• Vo l t s

• Millivolts

• Milliamps

• Ohms

ControlLogix isolated analog output modules convert a digital value to an analog signal. The following are example analog signal types to which output modules convert digital values:

• Vo l t s

• Milliamps

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Chapter 2 ControlLogix Isolated Analog I/O Module Features

Common Analog I/O Features

The ControlLogix isolated analog I/O modules have the following features:

• CIP Sync Timestamp of Data

• Rolling Timestamp of Data

• Floating Point Data Format

• Module Resolution

• Calibration

• Fault and Status Reporting

• Configurable Software

• Latching of Alarms

• Module Inhibiting

• Electronic Keying

CIP Sync Timestamp of Data

The control system uses a 64-bit system clock. The modules support CIP Sync timestamping by using the 1588 protocol passed throughout the system. The 1588 protocol is defined in the IEEE 1588-2002 standard, publication Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems.

Each input channel scan or new output application is stamped with a CIP Sync timestamp and a single timestamp is returned to the controller for the module with the input data transfer.

You can use this feature for the following:

• To identify the sequence of events in fault conditions or during normal

operation.

It is possible to use the system clock between multiple modules in the same chassis or throughout a system in which a common Time Master is used.

• To measure the change between samples–which likely correlates closely

with the RPI if no samples are missed in the logic–and to detect when a new sample is available for processing via the logic.

You can also use the 1588 Protocol to synchronize sampling for modules across the entire system. By using the Synchronized Sampling feature, described in detail on page 57 input samples precisely with each other when using the same RPI.

and page 81, you can configure multiple modules to coordinate their

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ControlLogix Isolated Analog I/O Module Features Chapter 2

Synchronized Sampling lets you configure a test stand, for example, and take many measurements simultaneously across many modules, if needed, while still precisely coordinating the sampling. With these modules, the synchronized sampling should coordinate within approximately ± 20 μs.

Rolling Timestamp of Data

The rolling timestamp is a continuously running 16-bit rolling timestamp that counts in milliseconds from 0…32,767 ms; where 1 ms = 1 count.

Rolling Timestamp with the 1756-IF8I and 1756-IRT8I Modules

The 1756-IF8I and 1756-IRT8I modules scan their inputs at the RPI, update the input data, and update the rolling timestamp value. Other ControlLogix analog input modules scan their inputs at the RTS, not the RPI.

In either case, though, the controller program uses the last two rolling timestamp values to calculate the interval between the receipt of data or the time at which new data is received.

The rolling value is commonly used with instructions such as the PID and PIDE instructions. Every time a rolling timestamp changes, a PID or PIDE instruction is executed. When you configure a PID instruction for use with a 1756-IF8I and 1756-IRT8I module, set the loop update time equal to the module’s RPI value.

Rolling Timestamp with the 1756-OF8I Module

For the 1756-OF8I module, the rolling timestamp value is updated only when new values are applied to the Digital to Analog Converter (DAC).

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Chapter 2 ControlLogix Isolated Analog I/O Module Features

EXAMPLE

Floating Point Data Format

The modules return channel data to the owner-controller in the IEEE 32-bit floating point data format. In your Logix Designer application, the data type is REAL. You can configure the module to scan its channels and return data as quickly as every 1 ms.

The floating point data format lets you change the data representation of the selected channel. Although the full range of the module does not change, you can scale your module to represent I/O data in specific terms for your application.

When you scale a channel, you select two points that represent signal units, that is, a Low Signal and a High Signal. You also select two points that represent engineering units, that is, Low Engineering and High Engineering.

The Low Signal point equates to the Low Engineering point and the High Signal point matches the High Engineering point.

A 1756-IF8I module used in current mode maintains 0…21 mA range capability. Your application uses a 4…20 mA transmitter.

• If you want to receive values in signal units, configure the module as follows:

– Low Signal = 4 mA – High Signal = 20 mA – Low Engineering = 4 EU – High Engineering = 20 EU

• If you want to receive values in terms of Percent of Full Scale, configure

the module as follows:

– Low Signal = 0 mA – High Signal = 20 mA – Low Engineering = 0% – High Engineering = 100%

By default, module channels used in Current mode are scaled such at 4…20 mA equate to 0…100% engineering units. Other module channels scale 1:1 with respect to signal units and engineering units by default.

Module Resolution

The modules support the following resolutions:

• 1756-IF8I and 1756-IRT8I modules – 24-bit resolution

• 1756-OF8I module – 16-bit resolution

For more information on module resolution, see page 35

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ControlLogix Isolated Analog I/O Module Features Chapter 2

Module Quality Reporting

The modules indicate the quality of channel data returned to the ownercontroller. Data quality represents accuracy. There are levels of data quality reported via module input tags.

The following input tags indicate the level of data quality. In the tag names, x represents the module channel number:

• I.Ch[x].Fault tag - This tag indicates that channel data can be completely inaccurate and cannot be trusted for use in the application. If the tag is set to 1, you cannot trust the data reported. You must troubleshoot the module to correct the cause of the inaccuracy.

Common causes of inaccurate data include the following:

– An overrange or underrange condition exists. – A wire off detection condition has occurred. – A short circuit detection condition has occurred.

• I.Ch[x].Uncertain tag - This tag indicates that channel data can be

inaccurate but it is not known to what degree of inaccuracy. We recommend that you do not use the data for control.

If the tag is set to 1, you know the data can be inaccurate but you must troubleshoot the module to discover what degree of inaccuracy exists.

Common causes of uncertain data include the following:

– The channel is actively being calibrated. – An invalid sensor offset value exists. – The channel’s last data sample failed CRC while the most recent data

sample was valid and used.

We recommend that you monitor these tags in your program to make sure the application is operating as expected with accurate channel input data.

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Chapter 2 ControlLogix Isolated Analog I/O Module Features

Calibration

These modules use precise analog components that maintain their specifications over time. The modules are calibrated at the factory and recalibration is not required.

If desired, you can recalibrate the modules on a channel-by-channel or modulewide basis. For more information, see Calibrated Accuracy on page 38 choose to recalibrate the modules in the future.

if you

Fault and Status Reporting

The modules provide fault and status data along with channel data. Faults are indicated via the status indicators on the front of the module as well as the module tags. Status data is available via the module tags.

• For more information on fault and status reporting via module tags, see the following:

– 1756-IF8I fault and status reporting - page 64 – 1756-IRT8I fault and status reporting - page 92 – 1756-OF8I fault and status reporting - page 102

• For more information on fault reporting via status indicators, see

Chapter 2, Troubleshoot Your Module on page 157

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ControlLogix Isolated Analog I/O Module Features Chapter 2

IMPORTANT

Configurable Software

Use one of the following software applications with your module:

• RSLogix 5000 software, versions 18…20

• Logix Designer application, version 21 or later

You must install Add-on Profiles (AOP) to use the modules in any Logix Designer application or RSLogix 5000 software project.

This publication describes configuration with Logix Designer application. AOPs are available at:

https://download.rockwellautomation.com/esd/ download.aspx?downloadid=addonprofiles

All module feature configuration begins in the I/O configuration portion of the Logix Designer application. In addition to enable or disable module features, you can use the application to interrogate any module for the following module information:

• Serial number

• Revision information

• Catalog number

• Vendor identification

• Error/fault information

• Diagnostic counters

For more information on configurable software and its use, see the following sections:

• Preface

• Chapter 7, Configure ControlLogix Isolated Analog I/O Modules

• Chapter 8, Calibrate the ControlLogix Isolated Analog I/O Modules

• Chapter 9, Troubleshoot Your Module

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Chapter 2 ControlLogix Isolated Analog I/O Module Features

IMPORTANT

Latching of Alarms

This feature latches a module alarm in the set position once the alarm is triggered. The alarm remains on, even if the condition causing it to occur disappears, until the alarm is unlatched.

You must manually unlatch the alarm. You can unlatch the alarm, by using one of the following methods:

• While the project is online, click the Alarm Configuration tab on the Module. Then click Unlatch to unlatch a specific alarm or Unlatch All to unlatch all alarms.

• Change the module output tag for the alarm that you want to unlatch. For example, the Ch[x].LLAlarmUnlatch tag to unlatch a Low Low Alarm.

For more information on module tags, see Appendix A, Isolated Analog I/O

Module Tag Definitions on page 173.

• Use a CIP Generic message.

For more information how to use a CIP Generic message, see Rockwell Automation Knowledgebase article #63046, How to Reset Latched Status of an Analog Module. You can access the article at: (Login required)

https://rockwellautomation.custhelp.com/

To see where to latch alarms, see page 131

and page 133.

Module Inhibiting

This feature suspends the connection between an owner-controller and a module. This process can occur in either of the following ways:

• You write configuration for an I/O module but inhibit the module to prevent it from communicating with the owner-controller.

In this case, the owner does not establish a connection and configuration is not sent to the module until the connection is uninhibited.

• A controller owns a module and has downloaded configuration to it. Data is currently being exchanged over the connection between the devices.

In this case, when you inhibit the module and the owner-controller behaves as if the connection to the module does not exist.

Whenever you inhibit an output module, it enters Program mode and all outputs change to the state configured for the Program mode. For example, if an output module is configured so that the state of the outputs go to zero (0) during Program mode, whenever that module is inhibited, the outputs go to zero (0).

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The following examples are instances where you need to use module inhibiting:

• Multiple controllers own an analog input module. A configuration change is required. You must make the change in the program in all controllers.

In this case, complete the following tasks. a. Inhibit the module. b. Change configuration in all controllers. c. Uninhibit the module.

• You want to upgrade the module. We recommend you complete the following tasks.

a. Inhibit the module. b. Perform the upgrade. c. Uninhibit the module.

• The program includes a module that you do not physically possess and you do not want the controller to continually look for a module that does not exist.

Inhibit the module until it physically resides in the proper slot.

To see where to inhibit a module connection, see page 126

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Chapter 2 ControlLogix Isolated Analog I/O Module Features

Electronic Keying

The electronic keying feature automatically compares the expected module, as shown in the I/O Configuration tree, to the physical module before I/O communication begins. You can use electronic keying to help prevent communication to a module that does not match the type and revision expected.

For each module in the I/O Configuration tree, the user-selected keying option determines if, and how, an electronic keying check is performed. Typically, three keying options are available:

• Exact Match

• Compatible Keying

• Disable Keying

You must carefully consider the benefits and implications of each keying option when selecting between them. For some specific module types, fewer options are available.

Electronic keying is based on a set of attributes unique to each product revision. When a Logix5000 controller begins communicating with a module, this set of keying attributes is considered.

Attribute Description

Vendor The manufacturer of the module, for example, Rockwell Automation/Allen-Bradley.

Product Type The general type of the module, for example, communication adapter, AC drive, or digital

Product Code The specific type of module, generally represented by its catalog number, for example,

Major Revision A number that represents the functional capabilities and data exchange formats of the

Minor Revision A number that indicates the module’s specific firmware revision. Minor Revisions

I/O.

1756-IRT8I.

module. Typically, although not always, a later, that is higher, Major Revision supports at least all of the data formats supported by an earlier, that is lower, Major Revision of the same catalog number and, possibly, additional ones.

typically do not impact data compatibility but can indicate performance or behavior improvement.

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ControlLogix Isolated Analog I/O Module Features Chapter 2

IMPORTANT

You can find revision information on the Module Definition dialog box.

Figure 2 - Module Definition Dialog Box

Changing electronic keying selections online can cause the I/O communication connection to the module to be disrupted and can result in a loss of data.

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Chapter 2 ControlLogix Isolated Analog I/O Module Features

EXAMPLE

IMPORTANT

Module Configuration Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IB16D Major Revision = 3 Minor Revision = 1

Physical Module Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IB16D Major Revision = 3 Minor Revision = 2

Communication is prevented

Exact Match

Exact Match Keying requires all keying attributes, that is, Vendor, Product Type, Product Code (catalog number), Major Revision, and Minor Revision, of the physical module and the module created in the software to match precisely to establish communication. If any attribute does not match precisely, I/O communication is not permitted with the module or with modules connected through it, as in the case of a communication module.

Use Exact Match keying when you need the system to verify that the module revisions in use are exactly as specified in the project, such as for use in highlyregulated industries. Exact Match keying is also necessary to enable Automatic Firmware Update for the module via the Firmware Supervisor feature from a Logix5000 controller.

In the following scenario, Exact Match keying prevents I/O communication:

The module configuration is for a 1756-IB16D module with module revision

3.1. The physical module is a 1756-IB16D module with module revision 3.2. In this case, communication is prevented because the Minor Revision of the module does not match precisely.

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Changing electronic keying selections online can cause the I/O Communication connection to the module to be disrupted and can result in a loss of data.

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