Rockwell Automation 1769-IF4, 1769-IF8, 1769-OF8V, 1769-OF8C, 1769-OF2 User Manual

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Compact I/O Analog Modules

1769-IF4, -IF8, -OF2, -OF8C, and

-OF8V

User Manual

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. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

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 we use notes to make you aware of safety considerations.

WARNING

IMPORTANT

ATTENTION

SHOCK HAZARD

BURN HAZARD

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.

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

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

• recognize the consequence

Labels may be located on or inside the drive to alert people that dangerous voltage may be present.

Labels may be located on or inside the drive to alert people that surfaces may be dangerous temperatures.

Summary of Changes

The 1769-IF8, -OF8C, and -OF8V modules have been added 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 next to this paragraph.

1 Publication 1769-UM002B-EN-P - July 2005

Summary of Changes 2

Notes:

Publication 1769-UM002B-EN-P - July 2005

Overview

Preface

Who Should Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . Preface-1

How to Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface-1

Manual Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface-1

Related Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface-2

Conventions Used in This Manual . . . . . . . . . . . . . . . . . . . . . . Preface-2

Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . . . . Preface-3

Local Product Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface-3

Technical Product Assistance . . . . . . . . . . . . . . . . . . . . . . . Preface-3

Your Questions or Comments on the Manual. . . . . . . . . . Preface-3

Chapter 1

How to Use Analog I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

General Diagnostic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

System Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Module Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Module Field Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Installation and Wiring

Chapter 2

Compliance to European Union Directives . . . . . . . . . . . . . . . . . . . . 2-1

EMC Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Low Voltage Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Hazardous Location Considerations. . . . . . . . . . . . . . . . . . . . . . . 2-3

Prevent Electrostatic Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Remove Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Reducing Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Protecting the Circuit Board from Contamination . . . . . . . . . . . 2-4

System Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Minimum Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

DIN Rail Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Replacing a Single Module within a System . . . . . . . . . . . . . . . . . . . . 2-9

External Power Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

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Table of Contents ii

Module Data, Status, and Channel Configuration for the Input Modules

Field Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

System Wiring Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Labeling the Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Removing the Finger-Safe Terminal Block . . . . . . . . . . . . . . . . 2-15

Wiring the Finger-Safe Terminal Block . . . . . . . . . . . . . . . . . . . 2-16

Wiring the Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Terminal Door Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Analog Input Modules Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Analog Output Modules Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

Chapter 3

1769-IF4 Input Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

1769-IF4 Input Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

1769-IF4 Configuration File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

1769-IF4 Input Data File. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

1769-IF4 Input Data Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

1769-IF4 Configuration Data File. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Enable/Disable Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Input Filter Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Input Type/Range Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Input Data Selection Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Effective Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

1769-IF8 Input Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

1769-IF8 Input Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

1769-IF8 Output Image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

1769-IF8 Configuration File . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

1769-IF8 Input Data File. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

1769-IF8 Input Data Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

1769-IF8 Output Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

1769-IF8 Configuration Data File. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20

Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22

Enable/Disable Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23

Input Filter Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23

Input Type/Range Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27

Input Data Selection Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-27

1769-IF8 Real Time Sampling. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29

1769-IF8 Process Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30

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Module Data, Status, and Channel Configuration for the Output Modules

Table of Contents iii

Chapter 4

1769-OF2 Output Module Memory Map. . . . . . . . . . . . . . . . . . . . . . 4-1

1769-OF2 Output Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

1769-OF2 Input Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

1769-OF2 Diagnostic Bits (D0 and D1). . . . . . . . . . . . . . . . . . . . 4-2

1769-OF2 Hold Last State Bits (H0 and H1). . . . . . . . . . . . . . . . 4-2

1769-OF2 Over-Range Flag Bits (O0 and O1) . . . . . . . . . . . . . . 4-3

1769-OF2 Under-Range Flag Bits (U0 and U1). . . . . . . . . . . . . . 4-3

1769-OF2 General Status Bits (S0 and S1). . . . . . . . . . . . . . . . . . 4-3

1769-OF2 Output Data Loopback/Echo . . . . . . . . . . . . . . . . . . 4-4

1769-OF2 Configuration Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

1769-OF2 Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . 4-6

1769-OF2 Enable/Disable Channel . . . . . . . . . . . . . . . . . . . . . . . 4-7

1769-OF2 Output Data Format Selection . . . . . . . . . . . . . . . . . . 4-7

1769-OF2 Output Type/Range Selection . . . . . . . . . . . . . . . . . . 4-8

1769-OF2 Fault Mode (FM0 and FM1) . . . . . . . . . . . . . . . . . . . . 4-8

1769-OF2 Program/Idle Mode (PM0 and PM1). . . . . . . . . . . . . 4-9

1769-OF2 Program/Idle to Fault Enable (PFE0 and PFE1) . . 4-10

1769-OF2 Fault Value (Channel 0 and 1). . . . . . . . . . . . . . . . . . 4-11

1769-OF2 Program/Idle Value (Channel 0 and 1) . . . . . . . . . . 4-11

1769-OF2 Module Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

1769-OF8C Output Module Memory Map . . . . . . . . . . . . . . . . . . . 4-16

1769-OF8V Output Module Memory Map . . . . . . . . . . . . . . . . . . . 4-17

1769-OF8C and -OF8V Output Data File . . . . . . . . . . . . . . . . . . . . 4-18

Channel Alarm Unlatch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18

1769-OF8C and -OF8V Input Data File . . . . . . . . . . . . . . . . . . . . . 4-19

1769-OF8C and -OF8V Data Values . . . . . . . . . . . . . . . . . . . . . 4-19

1769-OF8C and -OF8V Output Data Loopback/Echo . . . . . . 4-21

1769-OF8C and -OF8V Configuration Data File . . . . . . . . . . . . . . 4-22

1769-OF8C and -OF8V Channel Configuration . . . . . . . . . . . . 4-24

1769-OF8C and -OF8V Enable/Disable Channel . . . . . . . . . . 4-25

Clamping/Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25

Clamp/Limit Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26

Ramping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26

Hold for Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28

Open Wire Detection (1769-OF8C Only) . . . . . . . . . . . . . . . . . 4-29

1769-OF8C and -OF8V Fault Mode (FM). . . . . . . . . . . . . . . . . 4-29

1769-OF8C and -OF8V Program/Idle Mode (PM) . . . . . . . . . 4-30

1769-OF8C and -OF8V Program/Idle to Fault Enable (PFE). 4-31

1769-OF8C and -OF8V Fault Value . . . . . . . . . . . . . . . . . . . . . 4-31

1769-OF8C and -OF8V Program/Idle Value . . . . . . . . . . . . . . 4-32

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Table of Contents iv

Module Diagnostics and Troubleshooting

Chapter 5

Safety Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Activating Devices When Troubleshooting . . . . . . . . . . . . . . . . . 5-1

Stand Clear of the Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Program Alteration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Safety Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Module Operation vs. Channel Operation . . . . . . . . . . . . . . . . . . . . . 5-2

Power-up Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Channel Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Out-of-Range Detection (Input and Output Modules) . . . . . . . . 5-3

Open-Circuit Detection (Input Modules Only) . . . . . . . . . . . . . . 5-3

Output Wire Broken/High Load Resistance

(Output Modules Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Non-critical vs. Critical Module Errors. . . . . . . . . . . . . . . . . . . . . . . . 5-4

Module Error Definition Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Module Error Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Extended Error Information Field . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Module Inhibit Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

Contacting Rockwell Automation . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

Specifications

Module Addressing and Configuration with MicroLogix 1500

Configuration Using the RSLogix 5000 Generic Profile for CompactLogix Controllers

Appendix A

General Specifications for 1769-IF4, -IF8, -OF2, -OF8C,

and -OF8V Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

1769-IF4 Input Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

1769-IF8 Input Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

1769-OF2 Output Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7

1769-OF8C Output Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . A-9

1769-OF8V Output Specifications . . . . . . . . . . . . . . . . . . . . . . . . . A-11

Appendix B

Input Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Input Modules Input Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Input Modules’ Configuration File . . . . . . . . . . . . . . . . . . . . . . . . B-3

Configuring Analog I/O Modules in a MicroLogix 1500 System . . . B-4

Configuring the Input Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . B-6

Configuring the Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . B-7

Appendix C

Configuring I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6

Configuring Analog Output Modules. . . . . . . . . . . . . . . . . . . . . . C-7

Configuring Analog Input Modules . . . . . . . . . . . . . . . . . . . . . . . C-7

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Configuring Modules in a Remote DeviceNet System with a 1769-ADN DeviceNet Adapter

Two’s Complement Binary Numbers

Table of Contents v

Appendix D

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Add the DeviceNet Adapter to the Scanlist . . . . . . . . . . . . . . . . . . . D-2

Configure the 1769-IF4 Input Module Example . . . . . . . . . . . . . . . D-4

1769-IF4 Example of External Power . . . . . . . . . . . . . . . . . . . . D-6

Configure the 1769-OF8C Output Module Example . . . . . . . . . . . D-7

1769-OF8C Example of External Power . . . . . . . . . . . . . . . . . . D-8

1769-OF8C Example of Output Channels. . . . . . . . . . . . . . . . . D-9

Appendix E

Positive Decimal Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Negative Decimal Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

Glossary

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Table of Contents vi

Publication 1769-UM002B-EN-P - July 2005

Preface

Read this preface to familiarize yourself with the rest of the manual. This preface covers the following topics:

• who should use this manual

• how to use this manual

• related publications

• conventions used in this manual

• Rockwell Automation support

Who Should Use This Manual

How to Use This Manual

Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use Allen-Bradley Compact™ I/O.

As much as possible, we organized this manual to explain, in a task-by-task manner, how to install, configure, program, operate and troubleshoot a control system using the 1769 analog I/O modules.

Manual Contents

If you want... See

An overview of the analog input and output modules Chapter 1

Installation and wiring guidelines Chapter 2

Input module addressing, configuration and status information Chapter 3

Output module addressing, configuration and status information Chapter 4

Information on module diagnostics and troubleshooting Chapter 5

Specifications for the input and output modules Appendix A

Information on addressing and configuration using MicroLogix 1500 and RSLogix 500

Information on configuring the module using CompactLogix and RSLogix 5000

Information on configuring the module using 1769-ADN DeviceNet Adapter and RSNetWorx

Information on understanding two’s complement binary numbers Appendix E

Definitions of terms used in this manual Glossary

1 Publication 1769-UM002B-EN-P - July 2005

Appendix B

Appendix C

Appendix D

Conventions Used in This Manual

Publication 1769-UM002B-EN-P - July 2005

The following conventions are used throughout this manual:

• Bulleted lists (like this one) provide information not procedural steps.

• Numbered lists provide sequential steps or hierarchical information.

• Italic type is used for emphasis.

• Text in this font indicates words or phrases you should type.

Rockwell Automation Support

Rockwell Automation offers support services worldwide, with over 75 Sales/Support Offices, 512 authorized distributors and 260 authorized Systems Integrators located throughout the United States alone, plus Rockwell Automation representatives in every major country in the world.

Local Product Support

Contact your local Rockwell Automation representative for:

• sales and order support

• product technical training

• warranty support

• support service agreement

Technical Product Assistance

If you need to contact Rockwell Automation for technical assistance, please review the information in Chapter 5, Module Diagnostics and Troubleshooting first. Then call your local Rockwell Automation representative.

Your Questions or Comments on the Manual

If you find a problem with this manual, please notify us. If you have any suggestions for how this manual could be made more useful to you, please contact us at the address below:

Rockwell Automation Automation Control and Information Group Technical Communication, Dept. A602V P.O. Box 2086 Milwaukee, WI 53201-2086

Publication 1769-UM002B-EN-P - July 2005

Notes:

Publication 1769-UM002B-EN-P - July 2005

Chapter

Overview

This chapter explains how analog data is used, and describes the 1769-IF4 and

-IF8 analog input modules and the 1769-OF2, -OF8C, and -OF8V analog output modules. Included is information about:

• the use of analog I/O

• the modules’ hardware and diagnostic features

• an overview of the 1769 analog input system operation

• an overview of the 1769 analog output system operation

How to Use Analog I/O

Analog refers to the representation of numerical quantities by the measurement of continuous physical variables. Analog applications are present in many forms. The following application shows a typical use of analog data.

In this application, the processor controls the amount of fluid in a holding tank by adjusting the valve opening. The valve is initially open 100%. As the fluid level in the tank approaches the preset point, the processor modifies the output to close the valve 90%, 80%, and so on, continuously adjusting the valve to maintain the fluid level.

Figure 1.1 Analog I/O Application Example

Analog output wired to valve

Valve

Controller

Level Sensor

Analog input wired

to tank

Analog I/O

Module

1 Publication 1769-UM002B-EN-P - July 2005

1-2 Overview

General Description

The 1769-IF4 and -IF8 analog input modules convert and digitally store analog data for retrieval by controllers, such as the CompactLogix™ or MicroLogix™

1500. The module supports connections from any combination of up to four voltage or current analog sensors for the 1769-IF4 and up to eight for the 1769-IF8. The high-impedance input channels can be wired as either single-ended or differential inputs.

The 1769-OF2 output module provides two single-ended analog output channels, each individually configurable for voltage or current. The 1769-OF8C and -OF8V output modules each provide eight single-ended analog output channels.

Both modules provide the following input/output types/ranges:

Table 1.1 Normal and Full Ranges

Normal Operating Input Range Full Module Range

±10V dc ± 10.5V dc

1 to 5V dc 0.5 - 5.25V dc

0 to 5V dc -0.5 - +5.25V dc

0 to 10V dc -0.5 - +10.5V dc

0 to 20 mA 0 - 21 mA

4 to 20 mA 3.2 - 21 mA

The data can be configured on board each module as:

• Engineering Units

• Scaled-for-PID

• Percent

• Raw/Proportional Data

Publication 1769-UM002B-EN-P - July 2005

Overview 1-3

Hardware Features

The modules contain removable terminal blocks. The 1769-IF4 and -IF8 channels can be wired as either single-ended or differential inputs. The 1769-OF2, -OF8C, and -OF8V channels are single-ended only. Module configuration is normally done via the controller’s programming software. In addition, some controllers support configuration via the user program. In either case, the module configuration is stored in the memory of the controller. Refer to your controller’s user manual for more information.

Figure 1.2 1769-OF2, -OF8C, -OF8V and -IF4 Analog Module’s Hardware Features

Analog

10a

10b

Analog

DANGER

Do Not Remove RTB Under Power

Unless Area is Non-Hazardous

I out 0 +

I out 1 +

I out 2 +

I out 3 +

I out 4 +

I out 5 +

I out 6 +

I out 7 +

+24V dc

Ensure Adjacent Bus Lever is Unlatched/Latched Before/After Removing/Inserting Module

1769-OF8C

ANLG Com ANLG Com ANLG Com ANLG Com ANLG Com ANGL Com ANLG Com ANLG Com

NEUT

Table 1.2 1769-OF2, -OF8C, -OF8V, and -IF4 Feature Descriptions

Item Description

1 bus lever (with locking function)

2a upper panel mounting tab

2b lower panel mounting tab

3 module status LEDs

4 module door with terminal identification label

5a movable bus connector with female pins

5b stationary bus connector with male pins

6 nameplate label

7a upper tongue-and-groove slots

7b lower tongue-and-groove slots

8a upper DIN rail latch

8b lower DIN rail latch

9 write-on label for user identification tags

10 removable terminal block (RTB) with finger-safe cover

10a RTB upper retaining screw

10b RTB lower retaining screw

Publication 1769-UM002B-EN-P - July 2005

1-4 Overview

Figure 1.3 1769-IF8 Analog Module’s Hardware Features

IN 1

IN 3

IN 5

IN 7

IN 9

IN 11

IN 13

IN 15

DC COM

WARNING -Do Not Remove RTB Unless

Area is Non-Hazardous

IN 0

IN 2

IN 4

IN 6

DC COM

IN 8

IN 10

IN 12

IN 14

DC COM

1769-IQ32

IN 16

IN 17

IN 18

IN 19

IN 20

IN 21

IN 22

IN 23

DC COM

IN 25

IN 24

IN 27

IN 26

IN 29

IN 28

IN 31

IN 30

10a

10b

30538-M

Table 1.3 1769-IF8 Feature Descriptions

Item Description

1 bus lever (with locking function)

2a upper panel mounting tab

2b lower panel mounting tab

3 I/O diagnostic LEDs

4 module door with terminal identification label

5a movable bus connector with female pins

5b stationary bus connector with male pins

6 nameplate label

7a upper tongue-and-groove slots

7b lower tongue-and-groove slots

8a upper DIN rail latch

8b lower DIN rail latch

9 write-on label for user identification tags

10 removable terminal block (RTB) with finger-safe cover

10a RTB upper retaining screw

10b RTB lower retaining screw

Publication 1769-UM002B-EN-P - July 2005

Overview 1-5

General Diagnostic Features

The analog modules contain diagnostic features that can help you identify the source of problems that may occur during power-up or during normal channel operation. These power-up and channel diagnostics are explained in chapter 6,

Module Diagnostics and Troubleshooting.

System Overview

The modules communicate to the controller through the bus interface. The modules also receive 5 and 24V dc power through the bus interface. The 1769-IF4, -OF2, -OF8C, and -OF8V modules feature an external 24V dc power switch, providing you with the option of using an external power supply. See External Power Switch on page 2-10 for details.

You can install as many analog modules as your power supply can support. However, the modules have a power supply distance rating of 8, which means that they may not be located more than 8 modules away from the system power supply.

Figure 1.4 Determine Power Supply Distance

Adapter

Compact I/O

or I/O Communication

CompactLogix Controller

Compact I/O

System Power Supply

Compact I/O

1123432

End Cap

Compact I/O

Power Supply Distance

MicroLogix 1500 Controller

with Integrated System

Power Supply

Compact I/O

234

End Cap

Compact I/O

Power Supply Distance

Publication 1769-UM002B-EN-P - July 2005

1-6 Overview

System Operation

At power-up, the module performs a check of its internal circuits, memory, and basic functions. During this time, the module status LED remains off. If no faults are found during power-up diagnostics, the module status LED is turned on.

After power-up checks are complete, the module waits for valid channel configuration data. If an invalid configuration is detected, the module generates a configuration error. Once a channel is properly configured and enabled, it begins the analog-to-digital or digital-to-analog conversion process.

Input Modules

Each time a channel is read by the input modules, that analog data value is tested by the modules for an over-range or under-range condition. If such a condition is detected, a unique bit is set in the channel status word. The channel status word is described in 1769-IF4 Input Data File on page 3-2 and 1769-IF8 Input Data File on page 3-18.

The controller reads the two’s complement binary converted analog data from the modules. This typically occurs at the end of the program scan or when commanded by the control program. If the controller and the modules determine that the bus data transfer was made without error, the data is used in your control program.

Output Modules

The output modules monitor channels for over-range and under-range conditions and also for broken output wires and high load resistance (in current mode only). If such a condition is detected, a unique bit is set in the channel status word. The channel status word is described in 1769-OF2 Output Data File on page 4-2 and 1769-OF8C and -OF8V Output Data File on page 4-18.

The output module receives two’s complement binary values from the bus master. This typically occurs at the end of the program scan or when commanded by the control program. If the controller and the module determine that the bus transfer was completed without error, the output module converts the data to an analog output signal.

Publication 1769-UM002B-EN-P - July 2005

Input

Overview 1-7

Module Operation

Input Module Block Diagram

The input module’s input circuitry consists of four differential analog inputs multiplexed into a single analog-to-digital (A/D) converter. The A/D converter reads the selected input signal and converts it to a digital value which is presented to the controller. The multiplexer sequentially switches each input channel to the module’s A/D converter.

Figure 1.5 1769-IF4 Block Diagram

Galvanic

VA2

VA1 VS1

Isolation

CH0

Vin+

Iin+

V/Iin-

COM

A-GND

CH1

CH2

CH3

dc Neutral

+24V dc

Multiplexer

(same as above)

Vref VREF

Channel Select

AIN+

A/D

AIN-

VA3

TXD

MCU ASIC

RXD

DC/DC Power

VA1

VA2

VA3

Supply

A-GND S-GND

Bus

VS1

VS2

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1-8 Overview

Figure 1.6 1769-IF8 Block Diagram

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

Vin + Iin + V/ICom Vin + Iin + V/ICom

Select

High Impedance

Gain

Vref

Gain

Converter

EN0

EN1

CPU

Opto

Coupler

Opto

Coupler

Opto

Coupler

+15V

+5V

-15V

GND

ASIC

DC/DC

converter

LED

CN2

(Out)

+24V

GND

31542-M

CN1

(In)

Publication 1769-UM002B-EN-P - July 2005

Output

Overview 1-9

Output Module Block Diagram

The output module uses a digital-to-analog (D/A) converter to read the digital output data from the controller and convert it to an analog output signal.

Figure 1.7 1769-OF2 Block Diagram

Galvanic Isolation

VA2

VA1

VS1

CH0

Iout+

Vout+

COM

dc Neutral

+24V dc

A-GND

TXD

RXD

Power Supply

VA1

DC/DC

ASIC

VS1

VS2

A-GND

VA2

VA3

CH1

Analog Switch

Selec

Iout

D/A

Iout

Refout

Latch

Selec

MCU

VA2

(same as above)

VA3

A-GND S-GND

Figure 1.8 1769-OF8C and -OF8V Block Diagram

The following diagram shows only one of eight outputs. For each analog output, only one of the sections shown in broken-line boxes is implemented. The 1769-OF8C module uses only the Current Out section while the 1769-OF8V module uses only the Voltage Out section.

Bus

16 pin backplane connector

ASIC

+24 VDC

GND

Curent Out

Detect

CFU

64K Flash/

2K RAM

OPTOS

500VDC Isoleted

Power Supply

+5V

+15V -15V

GND

16 Bit

DAC

Voltage Out

ESD Limit

18 pin Terminal Block

EXT 24VDC

GND

Publication 1769-UM002B-EN-P - July 2005

1-10 Overview

Module Field Calibration

The 1769-IF4 and -IF8 input modules performs autocalibration when a channel is initially enabled. In addition, if a channel is configured differently than the previously scanned channel, an autocalibration cycle is run as part of the reconfiguration process.

The 1769-OF2, -OF8C, and -OF8V output modules’s calibration is guaranteed by its design. No field calibration is required.

Publication 1769-UM002B-EN-P - July 2005

Installation and Wiring

This chapter tells you how to:

• determine the power requirements for the modules

• avoid electrostatic damage

• install the module

• wire the module’s terminal block

• wire input devices

• wire output devices

Chapter

Compliance to European Union Directives

This product is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

The analog modules are tested to meet Council Directive 89/336/EEC Electromagnetic Compatibility (EMC) and the following standards, in whole or in part, documented in a technical construction file:

• EN 50081-2

EMC – Generic Emission Standard, Part 2 - Industrial Environment

• EN 50082-2

EMC – Generic Immunity Standard, Part 2 - Industrial Environment

This product is intended for use in an industrial environment.

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC Low Voltage, by applying the safety requirements of EN 61131-2 Programmable Controllers, Part 2 – Equipment Requirements and Tests.

For specific information required by EN61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications:

• Industrial Automation, Wiring and Grounding Guidelines for Noise Immunity,

publication 1770-4.1

• Automation Systems Catalog, publication B113

1 Publication 1769-UM002B-EN-P - July 2005

2-2 Installation and Wiring

Power Requirements

General Considerations

The modules receive power through the bus interface from the +5V dc/+24V dc system power supply. Some modules can also be supplied 24V dc power by an external power supply connected to the module’s terminal block.

Table 2.1 Maximum Current Draw

Module 5V dc 24V dc

1769-IF4 (Series A)

1769-IF4 (Series B)

120 mA

Not applicable

(1)

60 mA

1769-IF8 (Series A) 70 mA

1769-OF2 (Series A) 120 mA Not applicable

1769-OF2 (Series B)

1769-OF8C (Series A)

145 mA

1769-OF8V (Series A)

(1)

If the optional 24V dc Class 2 power supply is used, the 24V dc current draw from the bus is 0 mA.

120 mA

160 mA

125 mA

(1)

Compact I/O is suitable for use in an industrial environment when installed in accordance with these instructions. Specifically, this equipment is intended for

(1)

use in clean, dry environments (Pollution degree 2

exceeding Over Voltage Category II

(2)

(IEC 60664-1).

) and to circuits not

(3)

Publication 1769-UM002B-EN-P - July 2005

(1)

Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that occasionally a temporary conductivity caused by condensation shall be expected.

(2)

Over Voltage Category II is the load level section of the electrical distribution system. At this level transient voltages are controlled and do not exceed the impulse voltage capability of the product’s insulation.

(3)

Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC) designations.

Installation and Wiring 2-3

Hazardous Location Considerations

This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or non-hazardous locations only. The following WARNING statement applies to use in hazardous locations.

ATTENTION

EXPLOSION HAZARD

• Substitution of components may impair suitability for

Class I, Division 2.

• Do not replace components or disconnect equipment

unless power has been switched off or the area is known to be non-hazardous.

• Do not connect or disconnect components unless

power has been switched off or the area is known to be non-hazardous.

• This product must be installed in an enclosure.

• All wiring must comply with N.E.C. article 501-4(b).

Prevent Electrostatic Discharge

ATTENTION

Electrostatic discharge can damage integrated circuits or semiconductors if you touch analog I/O module bus connector pins or the terminal block on the input module. Follow these guidelines when you handle the module:

• Touch a grounded object to discharge static potential.

• Wear an approved wrist-strap grounding device.

• Do not touch the bus connector or connector pins.

• Do not touch circuit components inside the module.

• If available, use a static-safe work station.

• When it is not in use, keep the module in its

static-shield box.

Publication 1769-UM002B-EN-P - July 2005

2-4 Installation and Wiring

Remove Power

ATTENTION

Remove power before removing or inserting this module. When you remove or insert a module with power applied, an electrical arc may occur. An electrical arc can cause personal injury or property damage by:

• sending an erroneous signal to your system’s field

devices, causing unintended machine motion

• causing an explosion in a hazardous environment

• Electrical arcing causes excessive wear to contacts on

both the module and its mating connector and may lead to premature failure.

Reducing Noise

Most applications require installation in an industrial enclosure to reduce the effects of electrical interference. Analog inputs and outputs are highly susceptible to electrical noise. Electrical noise coupled to the analog inputs will reduce the performance (accuracy) of the module.

Group your modules to minimize adverse effects from radiated electrical noise and heat. Consider the following conditions when selecting a location for the analog module. Position the module:

System Assembly

• away from sources of electrical noise such as hard-contact switches,

relays, and AC motor drives

• away from modules which generate significant radiated heat, such as the

1769-IA16. Refer to the module’s heat dissipation specification.

In addition, route shielded, twisted-pair analog input and output wiring away from any high voltage I/O wiring.

Protecting the Circuit Board from Contamination

The printed circuit boards of the analog modules must be protected from dirt, oil, moisture, and other airborne contaminants. To protect these boards, the system must be installed in an enclosure suitable for the environment. The interior of the enclosure should be kept clean and the enclosure door should be kept closed whenever possible.

The module can be attached to the controller or an adjacent I/O module before or after mounting. For mounting instructions, see Panel Mounting Using the Dimensional Template on page 2-7, or DIN Rail Mounting on page 2-8. To

Publication 1769-UM002B-EN-P - July 2005

Installation and Wiring 2-5

work with a system that is already mounted, see Replacing a Single Module within a System on page 2-9.

Figure 2.1 Assemble the Compact I/O System

1. Disconnect power.

2. Check that the bus lever of the module to be installed is in the unlocked

(fully right) position.

3. Use the upper and lower tongue-and-groove slots (1) to secure the modules together (or to a controller).

4. Move the module back along the tongue-and-groove slots until the bus connectors (2) line up with each other.

5. Push the bus lever back slightly to clear the positioning tab (3). Use your fingers or a small screwdriver.

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2-6 Installation and Wiring

6. To allow communication between the controller and module, move the bus lever fully to the left (4) until it clicks. Ensure it is locked firmly in place.

Mounting

ATTENTION

When attaching I/O modules, it is very important that the bus connectors are securely locked together to ensure proper electrical connection.

7. Attach an end cap terminator (5) to the last module in the system by using the tongue-and-groove slots as before.

8. Lock the end cap bus terminator (6).

IMPORTANT

A 1769-ECR or 1769-ECL right or left end cap must be used to terminate the end of the bus.

ATTENTION

During panel or DIN rail mounting of all devices, be sure that all debris (metal chips, wire strands, etc.) is kept from falling into the module. Debris that falls into the module could cause damage at power up.

Publication 1769-UM002B-EN-P - July 2005

Minimum Spacing

Maintain spacing from enclosure walls, wireways, adjacent equipment, etc. Allow 50 mm (2 in.) of space on all sides for adequate ventilation.

Figure 2.2 Space Requirements

Top

Side Side

Host Controller

Compact I/O

Bottom

Compact I/O

End Cap

Compact I/O

Installation and Wiring 2-7

Panel Mounting

Mount the module to a panel using two screws per module. Use M4 or #8 panhead screws. Mounting screws are required on every module.

Figure 2.3 Panel Mounting Using the Dimensional Template

For more than 2 modules: (number of modules-1) X 35 mm (1,38 in.).

Refer to host controller documentation for this dimension.

132

(5.197)

(1.38)

28.5

(1.12)

122.6±0.2

(4.826±0.008)

NOTE: All dimensions are in mm (inches). Hole spacing tolerance: ±0.04 mm (0.016 in.).

Host Controller

Figure 2.4 Panel Mounting for the 1769-IF8 Using the Dimensional Template

Spacing for one-and-a-half-wide modules 52.5 mm (2.067 in).

Spacing for single-wide modules 35 mm (1.378 in).

Refer to host controller documentation for this dimension.

NOTE: Overall hole spacing tolerance: ±0.4 mm (0.016 in.)

Locate holes every 17.5 mm (0.689 in) to allow for a mix of single-wide and one-and-a-half-wide modules (e.g., 1769-OA16).

l Mounting

Host Controller

Compact I/O

Right End Cap

Publication 1769-UM002B-EN-P - July 2005

2-8 Installation and Wiring

Panel Mounting Procedure Using Modules as a Template

The following procedure allows you to use the assembled modules as a template for drilling holes in the panel. If you have sophisticated panel mounting equipment, you can use the dimensional template provided on page 2-7. Due to module mounting hole tolerance, it is important to follow these procedures:

1. On a clean work surface, assemble no more than three modules.

2. Using the assembled modules as a template, carefully mark the center of

all module-mounting holes on the panel.

3. Return the assembled modules to the clean work surface, including any previously mounted modules.

4. Drill and tap the mounting holes for the recommended M4 or #8 screw.

5. Place the modules back on the panel, and check for proper hole

alignment.

6. Attach the modules to the panel using the mounting screws.

TIP

7. Repeat steps 1 to 6 for any remaining modules.

If mounting more modules, mount only the last one of this group and put the others aside. This reduces remounting time during drilling and tapping of the next group.

DIN Rail Mounting

The module can be mounted using the following DIN rails: 35 x 7.5 mm (EN 50 022 - 35 x 7.5) or 35 x 15 mm (EN 50 022 - 35 x 15).

Before mounting the module on a DIN rail, close the DIN rail latches. Press the DIN rail mounting area of the module against the DIN rail. The latches will momentarily open and lock into place.

Publication 1769-UM002B-EN-P - July 2005

Installation and Wiring 2-9

Replacing a Single Module

The module can be replaced while the system is mounted to a panel (or DIN rail). Follow these steps in order:

within a System

1. Remove power. See important note on 2-4.

2. On the module to be removed, remove the upper and lower mounting

screws from the module (or open the DIN latches using a flat-blade or phillips-style screwdriver).

3. Move the bus lever to the right to disconnect (unlock) the bus.

4. On the right-side adjacent module, move its bus lever to the right

(unlock) to disconnect it from the module to be removed.

5. Gently slide the disconnected module forward. If you feel excessive resistance, check that the module has been disconnected from the bus, and that both mounting screws have been removed (or DIN latches opened).

TIP

It may be necessary to rock the module slightly from front to back to remove it, or, in a panel-mounted system, to loosen the screws of adjacent modules.

6. Before installing the replacement module, be sure that the bus lever on the module to be installed and on the right-side adjacent module are in the unlocked (fully right) position.

7. Slide the replacement module into the open slot.

8. Connect the modules together by locking (fully left) the bus levers on

the replacement module and the right-side adjacent module.

9. Replace the mounting screws (or snap the module onto the DIN rail).

Publication 1769-UM002B-EN-P - July 2005

2-10 Installation and Wiring

External Power Switch

External Power Supply Switch

Bus Power (default)

External Power

The analog modules have an external 24V dc power switch which gives you the option of using an external power supply. The switch is located in on the lower left portion of the module’s circuit board, as shown below. With the switch pressed on the top (default), 24V dc power is drawn from the 1769 system power supply via the 1769 I/O bus. Pressed on the bottom, 24V dc power is drawn from the external power supply.

Wire the external power supply to the module via the module’s terminal block. The external power supply must be Class 2 rated, with a 24V dc range of 20.4 to 26.4V dc and a minimum current rating that meets the needs of the modules used in your application. Refer to Maximum Current Draw on page 2-2.

IMPORTANT

Only 1769-IF4 and -OF2 Series B modules have the 24V dc power switch.

Figure 2.5 External Power Switch

1769-IF4 and -OF2 Modules 1769-OF8C and -OF8V Modules

External Power Switch

Pressed on the Top

Bus Power (default)

Pressed on the Bottom

External Power

BUS EXT

Field Wiring Connections

Publication 1769-UM002B-EN-P - July 2005

Grounding

This product is intended to be mounted to a well-grounded mounting surface such as a metal panel. Additional grounding connections from the module’s mounting tabs or DIN rail (if used) are not required unless the mounting surface cannot be grounded. Refer to Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley publication 1770-4.1, for additional information.

Installation and Wiring 2-11

System Wiring Guidelines

Consider the following when wiring your system:

General

• All module commons (ANLG COM) are connected in the analog

module. The analog common (ANLG COM) is not connected to earth ground inside the module.

• Channels are not isolated from each other.

• Do not use the analog module’s NC terminals as connection points.

• To ensure optimum accuracy, limit overall cable impedance by keeping

your cable as short as possible. Locate the I/O system as close to your sensors or actuators as your application will permit.

• Use Belden™ 8761, or equivalent, shielded wire.

• Keep shield connection to ground as short as possible.

• Under normal conditions, the drain wire and shield junction must be

connected to earth ground via a panel or DIN rail mounting screw at

the analog I/O module end.

(1)

1769-IF4 and -IF8 Input Modules

• If multiple power supplies are used with analog inputs, the power supply

commons must be connected together.

• The 1769-IF4 and -IF8 modules do not provide loop power for analog

inputs. Use a power supply that matches the input transmitter specifications.

• Differential analog inputs are more immune to noise than single-ended

analog inputs.

• Voltages on Vin+, V/Iin-, and Iin+ of the 1769-IF4 and -IF8 modules

must be within ±10V dc of analog common.

1769-OF2, -OF8C, and -OF8V Output Modules

• Voltage outputs (Vout 0+ and Vout 1+ for 1769-OF2, Vout 0+

through Vout 7+ for 1769-OF8V) of the output modules are referenced to ANLG COM. Load resistance for a voltage output channel must be equal to or greater than 1K Ω.

• Current outputs (Iout 0+ and Iout 1+ for 1769-OF2, Iout 0+ through

Iout 7+ for 1769-OF8C) of the output modules source current that returns to ANLG COM. Load resistance for a current output channel must remain between 0 and 500 Ω.

(1)

In environments where high-frequency noise may be present, it may be necessary to directly ground cable shields to earth at the module end and via a 0.1µF capacitor at the sensor end.

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2-12 Installation and Wiring

Effect of Transducer/Sensor and Cable Length Impedance on Voltage Input Accuracy

For voltage inputs, the length of the cable used between the transducer/sensor and the 1769-IF4 or -IF8 module can affect the accuracy of the data provided by the module.

Figure 2.6 Voltage Input Accuracy

RcRs

Where:

V in

Rc = DC resistance of the cable (each conductor) depending on cable length

Rs = Source impedance of analog transducer/sensor input

Ri = Impedance of the voltage input

(220 KΩ for 1769-IF4 and -IF8)

Vs = Voltage source

(voltage at the transducer/sensor input device)

Vin = Measured potential at the module input

%Ai = Percent added inaccuracy in a voltage-based system due to source and cable impedance.

Vin

Rs 2 Rc×()Ri++[]

Ri Vs×[]

-------------------------------------------------------

For example, for Belden 8761 two conductor, shielded cable:

Rc = 16 Ω/1000 ft Rs = 0 (ideal

%Ai 1

Vin

⎛⎞

---------

∠

⎝⎠

100×=

source)

Publication 1769-UM002B-EN-P - July 2005

Table 2.2 Effect of Cable Length on Input Accuracy

Installation and Wiring 2-13

Length of Cable (m) dc resistance of the cable,

Rc (Ω)

50 2.625 0.00238%

100 5.25 0.00477%

200 10.50 0.00954%

300 15.75 0.0143%

Accuracy impact at the

input module

As input source impedance (Rs) and/or resistance (dc) of the cable (Rc) get larger, system accuracy decreases. If you determine that the inaccuracy error is significant, implementing the following equation in the control program can compensate for the added inaccuracy error due to the impedance of the source and cable.

Rs 2 Rc×()Ri++[]

-------------------------------------------------------

×=

TIP

Vs Vin

In a current loop system, source and cable impedance do not impact system accuracy.

Effect of Device and Cable Output Impedance on Output Module Accuracy

The maximum value of the output impedance is shown in the example below, because it creates the largest deviation from an ideal voltage source.

Figure 2.7 Output Module Accuracy

Where:

Rc = DC resistance of the cable (each conductor) depending on cable length

Rs = Source impedance

(15 Ω for 1769-OF2 and 1 Ω for 1769-OF8V)

Ri = Impedance of the voltage input

(220 KΩ for 1769-IF4)

Vs = Voltage at the output of 1769-OF2

Vin = Measured potential at the module input

%Ai = Percent added inaccuracy in a voltage-based system due to source and cable impedance.

Vin

Ri Vs×[]

-------------------------------------------------------=

Rs 2 Rc×()Ri++[]

RcRs

V in

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2-14 Installation and Wiring

For example, for Belden 8761 two conductor, shielded cable and a 1769-IF4 input module:

Rc = 16 Ω/1000 ft Rs = 15 Ω

%Ai 1

Vin

⎛⎞

---------

∠

⎝⎠

100×=

Ri = 220 KΩ

Table 2.3 Effect of Output Impedance and Cable Length on Accuracy

Length of Cable (m) dc resistance of the cable

Rc (Ω)

50 2.625 0.00919%

100 5.25 0.01157%

200 10.50 0.01634%

300 15.75 0.02111%

Accuracy impact at the

input module

As output impedance (Rs) and/or resistance (dc) of the cable (Rc) get larger, system accuracy decreases. If you determine that the inaccuracy error is significant, implementing the following equation in the control program can compensate for the added inaccuracy error due to the impedance of the output module and cable.

Rs 2 Rc×()Ri++[]

-------------------------------------------------------

×=

TIP

Vs Vin

In a current loop system, source and cable impedance do not impact system accuracy.

Publication 1769-UM002B-EN-P - July 2005

Installation and Wiring 2-15

Labeling the Terminals

A removable, write-on label is provided with the module. Remove the label from the door, mark the identification of each terminal with permanent ink, and slide the label back into the door. Your markings (ID tag) will be visible when the module door is closed.

Figure 2.8 Terminal Labels

upper retaining screw

lower retaining screw

wiring the finger-safe terminal block

Removing the Finger-Safe Terminal Block

When wiring field devices to the module, it is not necessary to remove the terminal block. If you remove the terminal block, use the write-on label on the side of the terminal block to identify the module slot location and type. RTB position can be indicated by circling either the ‘R’ for right side or ‘L’ for left side.

Figure 2.9 Finger-Safe Terminal Block

SLOT # _____

MODULE TYPE ______

To remove the terminal block, loosen the upper and lower retaining screws. The terminal block will back away from the module as you remove the screws. When replacing the terminal block, torque the retaining screws to 0.46 Nm (4.1 in-lbs).

Publication 1769-UM002B-EN-P - July 2005

2-16 Installation and Wiring

Wiring the Finger-Safe Terminal Block

When wiring the terminal block, keep the finger-safe cover in place.

1. Loosen the terminal screws to be wired.

2. Begin wiring at the bottom of the terminal block and move up.

3. Route the wire under the terminal pressure plate. You can use the bare

wire or a spade lug. The terminals accept a 6.35 mm (0.25 in.) spade lug.

TIP

The terminal screws are non-captive. Therefore, it is possible to use a ring lug [maximum 1/4 inch o.d. with a

0.139 inch minimum i.d. (M3.5)] with the module.

4. Tighten the terminal screw making sure the pressure plate secures the wire. Recommended torque when tightening terminal screws is 0.68 Nm (6 in-lbs).

TIP

If you need to remove the finger-safe cover, insert a screwdriver into one of the square, wiring holes and gently pry the cover off. If you wire the terminal block with the finger-safe cover removed, you will not be able to put it back on the terminal block because the wires will be in the way.

Wire Size and Terminal Screw Torque

Each terminal accepts up to two wires.

Table 2.4 Terminal Wire Considerations

Publication 1769-UM002B-EN-P - July 2005

Wire Type Wire Size Terminal Screw

Torque

Solid Cu-90°C (194°F) #14 to #22 AWG 0.68 Nm (6 in-lbs) 0.46 Nm (4.1 in-lbs)

Stranded Cu-90°C (194°F) #16 to #22 AWG 0.68 Nm (6 in-lbs) 0.46 Nm (4.1 in-lbs)

Retaining Screw

Torque

Wiring the Modules

Installation and Wiring 2-17

ATTENTION

To prevent shock hazard, care should be taken when wiring the module to analog signal sources. Before wiring any analog module, disconnect power from the system power supply and from any other source to the analog module.

After the analog module is properly installed, follow the wiring procedure below. To ensure proper operation and high immunity to electrical noise, always use Belden™ 8761 (shielded, twisted-pair) or equivalent wire.

ATTENTION

When wiring an analog input, take care to avoid connecting a voltage source to a channel configured for current input. Improper module operation or damage to the voltage source can occur.

Never connect a voltage or current source to an analog output channel.

Figure 2.10 Belden 8761 Wire

cable

Cut foil shield and drain wire

signal wire

drain wire

foil shield

signal wire

Publication 1769-UM002B-EN-P - July 2005

2-18 Installation and Wiring

To wire your module follow these steps.

1. At each end of the cable, strip some casing to expose the individual wires.

2. Trim the signal wires to 2-inch lengths. Strip about 3/16 inch (5 mm) of insulation away to expose the end of the wire.

ATTENTION

Be careful when stripping wires. Wire fragments that fall into a module could cause damage at power up.

3. At one end of the cable, twist the drain wire and foil shield together.

Under normal conditions, this drain wire and shield junction must be connected to earth ground, via a panel or DIN rail mounting screw at the analog I/O module end. Keep the length of the drain wire as short as possible.

In environments where high frequency noise may be present, it may be necessary to ground the cable shields to earth at the module end via a

0.1 µF capacitor at the sensor end for analog inputs and at the load end for analog outputs.

4. At the other end of the cable, cut the drain wire and foil shield back to the cable.

5. Connect the signal wires to the terminal block as shown in Analog Input Modules Wiring on page 2-19 and Analog Output Modules Wiring on page 2-24. Connect the other end of the cable to the analog input or output device.

Publication 1769-UM002B-EN-P - July 2005

6. Repeat steps 1 through 5 for each channel on the module.

Terminal Door Label

Installation and Wiring 2-19

Analog Input Modules Wiring

Figure 2.11 1769-IF4 Terminal Layout

DANGER

Do Not Remove RTB Under Power Unless Area is Non-Hazardous.

+24V dc

Analog Source

(optional)

V in 0 +

I in 0+

V in 1 +

I in 1+

V in 2 +

I in 2+

V in 3 +

I in 3+

1769-IF4

(2)

V/I in 0 -

ANLG Com

V/I in 1 -

ANLG Com

V/I in 2 -

ANLG Com

V/I in 3 -

ANLG Com

dc NEUT

V in 0 +

I in 0 +

V in 1 +

I in 1 +

V in 2 +

I in 2 +

V in 3 +

I in 3 +

+24V dc

V/I in 0 -

ANLG Com

V/I in 1 -

ANLG Com

V/I in 2 -

ANLG Com

V/I in 3 -

ANLG Com

dc NEUT

Ensure Adjacent Bus Lever is Unlatched/Latched Before/After Removing/Inserting Module

Figure 2.12 1769-IF4 Wiring Diagram Showing Differential Inputs

Belden 8761 cable (or equivalent)

1769-IF4

V/I in 0 -

ANLG Com

V/I in 1 -

ANLG Com

V/I in 2 -

ANLG Com

V/I in 3 -

ANLG Com

dc NEUT

V in 0 +

I in 0+

V in 1 +

I in 1+

V in 2 +

I in 2+

V in 3 +

I in 3+

+24V dc

earth ground

shield locally at

the module

External 24V dc

Power Supply

–

(1)

(1) The external power supply must be rated Class 2, with a 24V dc range of 20.4 to 26.4V dc and 60 mA minimum

for a single input module.

(2 ) Series B and later modules provide this option.

Publication 1769-UM002B-EN-P - July 2005

2-20 Installation and Wiring

Figure 2.13 1769-IF4 Wiring Single-ended Sensor/Transmitter Types

1769-IF4 Terminal Block

Sensor/

Transmitter

Supply

External 24V dc

Power Supply

(optional)

(2)

Current

Transmitter

Signal

Voltage

Tra ns mi tt er

Ground

Voltage

Transmitter

Ground

(1)

Signal

V in 0 +

V/I in 0 -

I in 0 + ANLG Com

V in 1 +

V/I in 1 -

I in 1 + ANLG Com

V in 2 +

V/I in 2 -

I in 2 +

ANLG Com

V in 3 +

V/I in 3 -

I in 3 +

ANLG Com

+24V dc

dc NEUT

(1) The external power supply must be rated Class 2, with a 24V dc range of 20.4 to 26.4V dc and 60 mA minimum

for a single input module.

(2 ) Series B and later modules provide this option.

Publication 1769-UM002B-EN-P - July 2005

Figure 2.14 1769-IF4 Wiring Mixed Transmitter Types

Single-ended

Voltage

Transmitter

–

Differential

Voltage

Transmitter

–

Supply

Differential

Current

Transmitter

–

Supply

2-Wire Current

Transmitter

Signal

–

Signal

Installation and Wiring 2-21

1769-IF4 Terminal Block

V in 0 +

V/I in 0 -

I in 0 + ANLG Com V in 1 +

V/I in 1 -

I in 1 + ANLG Com

V in 2 + V/I in 2 -

I in 2 +

ANLG Com

V in 3 +

V/I in 3 -

I in 3 +

ANLG Com

+24V dc

dc NEUT

Sensor/Transmi

tter Supply

–

External 24V dc

Power Supply

(optional)

(1) The external power supply must be rated Class 2, with a 24V dc range of 20.4 to 26.4V dc and 60 mA minimum

for a single input module.

(2) Series B and later modules provide this option.

(1)

–

Publication 1769-UM002B-EN-P - July 2005

2-22 Installation and Wiring

–

Figure 2.15 1769-IF8 Terminal Layout

/I in 0-

NLG Com

/I in 1-

NLG Com

/I in 2-

NLG Com

/I in 3-

NLG Com

V in 0+

I in 0

V in 1+

I in 1

V in 2+

I in 2

V in 3+

I in 3

V/I in 4-

ANLG Com

V/I in 5-

ANLG Com

V/I in 6-

ANLG Com

V/I in 7-

ANLG Com

V in 4+

I in 4

V in 5+

I in 5

V in 6+

I in 6

V in 7+

I in 7

Figure 2.16 1769-IF8 Wiring Differential Inputs

Belden 8761 cable (or equivalent)

WARNING -Do Not

Remove RTB Unless

Area is Non-Hazardous

V in 0+

V/I in 0-

ANLG Com

I in 0+

V in 1+

V/I in 1-

I in 1+

ANLG Com

V in 2+

V/I in 2-

I in 2+

ANLG Com

V in 3+

V/I in 3-

I in 3+

ANLG Com

analog source

V/I in 4-

ANLG Com

V/I in 5-

ANLG Com

V/I in 6-

ANLG Com

V/I in 7-

ANLG Com

V in 4+

I in 4+

V in 5+

I in 5+

V in 6+

I in 6+

V in 7+

I in 7+

1769-IF8

V/I in 0-

ANLG Com

V/I in 1-

ANLG Com

V/I in 2-

ANLG Com

V/I in 3-

ANLG Com

V in 0+

I in 0+ V in 1+ I in 1+ V in 2+ I in 2+ V in 3+ I in 3+

earth ground the

shield locally at

the module

V/I in 4-

ANLG Com

V/I in 5-

ANLG Com

V/I in 6-

ANLG Com

V/I in 7-

ANLG Com

V in 4+

I in 4+ V in 5+ I in 5+ V in 6+ I in 6+ V in 7+ I in 7+

Publication 1769-UM002B-EN-P - July 2005

Installation and Wiring 2-23

–

Figure 2.17 1769-IF8 Wiring Single-Ended Sensor/Transmitter Types

Sensor/Tran

smitter

Supply

(1)

Current

Transmitter

Signal

Voltage

Transmitter

Ground

Voltage

Transmitter

Ground

Signal

(1) The external power supply must be rated Class 2, with a 24V dc range of 20.4 to 26.4V dc and 60 mA minimum

for a single input module.

1769-IF8 Terminal Block

V in 0 +

V/I

I in 0 +

V in 1 +

V/I

I in 1 + AN

V in 2 +

V/I in 2

I in 2 +

V in 3 +

V/I

I in 3 +

Wiring for channels 4-7 are identical.

Figure 2.18 1769-IF8 Wiring Mixed Transmitter Types

Single-ended

Voltage

Transmitter

–

Differential

Voltage

Transmitter

Supply

Differential

Current

Transmitter

Supply

2-Wire Current

Transmitter

(1)

Signal

+ –

–

Signal

1769-IF8 Terminal Block

V in 0 + V/I in 0 I in 0 +

ANLG Com V in 1 + V/I in 1 I in 1 + ANLG Com

V in 2 + V/I in 2 I in 2 + ANLG Com

V in 3 + V/I in 3 I in 3 + ANLG Com

NC NC

Sensor/

Transmitter

Supply

–

Wiring for channels 4-7 are identical.

(1) The external power supply must be rated Class 2, with a 24V dc range of 20.4 to 26.4V dc and 60 mA minimum

for a single input module.

Publication 1769-UM002B-EN-P - July 2005

2-24 Installation and Wiring

Analog Output Modules Wiring

Figure 2.19 1769-OF2 Terminal Layout

I out 0 +

I out 1 +

dc Neutral

Figure 2.20 1769-OF2 Wiring Diagram

V out 0 +

ANLG Com

V out 1 +

ANLG Com

+24V dc

DANGER

Do Not Remove RTB Under Power Unless Area is Non-Hazardous.

V in 0 -

ANLG

Com 0

V in 0 +

I in 0

V out 0 +

I out 0 +

ANLG Com

V out 1 +

I out 1 +

ANLG Com

+24V dc

dc NEUT

I in 3

1769-OF2

ANLG

Com 3

Ensure Adjacent Bus Lever is Unlatched/Latched Before/After Removing/Inserting Module

1769-OF2 Terminal Block

V out 0 +

Voltage Load

earth ground

Current Load

earth ground

External 24V dc

Power Supply

(optional)

(1) The external power supply must be rated Class 2, with a 24V dc range of 20.4 to 26.4V dc and 120 mA minimum

per output module.

(1)

I out 0 +

ANLG Com

V out 1 +

I out 1 +

ANLG Com

+24V dc

dc NEUT

Publication 1769-UM002B-EN-P - July 2005

Figure 2.21 1769-OF8C Terminal Layout

I out 0+

I out 1+

I out 2+

I out 3+

I out 4+

I out 5+

I out 6+

I out 7+

24V dc

ANLG Com

dc NEUT

Figure 2.22 1769-OF8C Wiring Diagram

Installation and Wiring 2-25

DANGER

Do Not Remove RTB Under Power Unless Area is Non-Hazardous.

+24V

24v

Ensure Adjacent Bus Lever is Unlatched/Latched Before/After Removing/Inserting Module

NEUT

1769-OF

ANLG Com

dc NEUT

Current Load

External 24V dc Power

Supply (optional)(1)

earth ground

I out 0+

I out 1+

I out 2+

I out 3+

I out 4+

I out 5+

I out 6+

I out 7+

+24V dc

(1) The external power supply must be rated Class 2, with a 24V dc range of 20.4 to 26.4V dc and 120 mA minimum

per output module.

Publication 1769-UM002B-EN-P - July 2005

2-26 Installation and Wiring

Figure 2.23 1769-OF8V Terminal Layout

V out 0+

V out 1+

V out 2+

V out 3+

V out 4+

V out 5+

V out 6+

V out 7+

24V dc

ANLG Com

dc NEUT

Figure 2.24 1769-OF8V Wiring Diagram

DANGER

Do Not Remove RTB Under Power Unless Area is Non-Hazardous.

+24V

24v

Ensure Adjacent Bus Lever is Unlatched/Latched Before/After Removing/Inserting Module

NEUT

1769-OF8V

ANLG Com

dc NEUT

Voltage Load

External 24V dc Power

Supply (optional)(1)

earth ground

V out 0+

V out 1+

V out 2+

V out 3+

V out 4+

V out 5+

V out 6+

V out 7+

+24V dc

(1) The external power supply must be rated Class 2, with a 24V dc range of 20.4 to 26.4V dc and 120 mA minimum

per output module.

Publication 1769-UM002B-EN-P - July 2005

Chapter

Module Data, Status, and Channel Configuration for the Input Modules

This chapter examines the analog input modules’ data table, channel status, and channel configuration word. The 1769-IF4 module information follows. For 1769-IF8 module information, see page 3-16.

1769-IF4 Input Module Addressing

slot e

Input Image

Output Image

File

slot e

Configuration

File

The 1769-IF4 memory map shows the input and configuration image tables for the 1769-IF4. Detailed information on the input image table can be found in 1769-IF4 Input Data File on page 3-2.

Figure 3.1 1769-IF4 Memory Map

Memory Map

Input Image

6 words

Configuration

File

4 words

Channel 0 Data Word Channel 1 Data Word Channel 2 Data Word

Channel 3 Data Word

General Status Bits

Over-/Under-range Bits

Channel 0 Configuration Word Channel 1 Configuration Word

Channel 2 Configuration Word Channel 3 Configuration Word

Bit 15 Bit 0

Word 0 Word 1

Word 2

Word 3

Word 4, bits 0 to 3

Word 5, bits 0 to 15

Word 0 Word 1 Word 2 Word 3

1 Publication 1769-UM002B-EN-P - July 2005

3-2 Module Data, Status, and Channel Configuration for the Input Modules

1769-IF4 Input Image

The 1769-IF4 input image file represents data words and status bits. Input words 0 through 3 hold the input data that represents the value of the analog inputs for channels 0 through 3. These data words are valid only when the channel is enabled and there are no errors. Input words 4 and 5 hold the status bits. To receive valid status information, the channel must be enabled.

1769-IF4 Input Data File

TIP

You can access information in the input image file using the programming software configuration screen.

1769-IF4 Configuration File

The configuration file contains information that you use to define the way a specific channel functions. The configuration file is explained in more detail in 1769-IF4 Configuration Data File on page 3-4.

TIP

The input data table lets you access analog input module read data for use in the control program, via word and bit access. The data table structure is shown in table below.

Table 3.1 1769-IF4 Input Data Table

Not all controllers support program access to the configuration file. Refer to your controller’s user manual.

Word/Bit 1514131211109876543210

Word 0 SGN Analog Input Data Value Channel 0

Word 1 SGN Analog Input Data Value Channel 1

Word 2 SGN Analog Input Data Value Channel 2

Word 3 SGN Analog Input Data Value Channel 3

Word 4 Not Used (Bits set to 0) S3 S2 S1 S0

Word 5 U0 O0U1O1U2O2U3O3 Set to zero

Publication 1769-UM002B-EN-P - July 2005

Module Data, Status, and Channel Configuration for the Input Modules 3-3

1769-IF4 Input Data Values

Words 0 through 3 contain the converted analog input data from the field device. The most significant bit (MSB) is the sign bit.

General Status Bits (S0 through S3)

Word 4, bits 0 through 3 contain the general operational status bits for input channels 0 through 3. If set (1), these bits indicate an error associated with that channel. The over- and under-range bits for channels 0 through 3 are logically ORed to the appropriate general status bit.

Over-Range Flag Bits (O0 through O3)

Over-range bits for channels 3 through 0 are contained in word 5, bits 8, 10, 12, and 14. They apply to all input types. When set (1), this bit indicates input signals beyond the normal operating range. However, the module continues to convert analog data to the maximum full range value. The bit is automatically reset (0) by the module when the over-range condition is cleared and the data value is within the normal operating range.

Under-Range Flag Bits (U0 through U3)

Under-range bits for channels 3 through 0 are contained in word 5, bits 9, 11, 13, and 15. They apply to all input types. When set (1), this bit indicates input signals below the normal operating range. It may also indicate an open circuit condition, when the module is configured for the 4 to 20 mA range. However, the module continues to convert analog data to the minimum full range value. The bit is automatically reset (0) by the module when the under-range condition is cleared and the data value is within the normal operating range.

Publication 1769-UM002B-EN-P - July 2005

3-4 Module Data, Status, and Channel Configuration for the Input Modules

1769-IF4 Configuration Data

The configuration file lets you determine how each individual input channel will operate. Parameters such as the input type and data format are set up using

File

this file. This data file is writable and readable. The default value of the configuration data table is all zeros. The structure of the channel configuration file is shown below.

Table 3.2 1769-IF4 Configuration Data Table

Word/Bit 15 14 13 1211109 876543210

Word 0

Word 1

Word 2

Word 3

(1)

The ability to change these values using your control program is not supported by all controllers. Refer to your controller manual for details.

Enable Channel 0

Enable Channel 1

Enable Channel 2

Enable Channel 3

Input Data Format

Select Channel 0

Input Data Format

Select Channel 1

Input Data Format

Select Channel 2

Input Data Format

Select Channel 3

Input Type/Range

Select Channel 0

Input Type/Range

Select Channel 1

Input Type/Range

Select Channel 2

Input Type/Range

Select Channel 3

(1)

Reserved

Input Filter Select

Channel 0

Input Filter Select

Channel 1

Input Filter Select

Channel 2

Input Filter Select

Channel 3

The configuration file is typically modified using the programming software configuration screen. For information on configuring the module using MicroLogix 1500 and RSLogix 500, see Appendix B; for CompactLogix and RSLogix 5000, see Appendix C; for 1769-ADN DeviceNet Adapter and RSNetWorx, see Appendix D.

The configuration file can also be modified through the control program, if supported by the controller. The structure and bit settings are shown in Channel Configuration on page 3-5.

Publication 1769-UM002B-EN-P - July 2005

Module Data, Status, and Channel Configuration for the Input Modules 3-5

Channel Configuration

Each channel configuration word consists of bit fields, the settings of which determine how the channel operates. See the table below and the descriptions that follow for valid configuration settings and their meanings. The default bit status of the configuration file is all zeros.

Table 3.3 Bit Definitions for Channel Configuration Words 0 through 3

Bit(s) Define

0 to 3 Input Filter Select

4 to 7 Reserved

8 to 11Input Type/Range

Select

12 to 14Input Data

Format Select

These bit settings

Indicate this

151413121110 9 876543210

000060 Hz

000150 Hz

0010Not Used

0011250 Hz

0100500 Hz

Not Used

Reserved

0000 -10 to +10V dc

0001 0 to 5V dc

0010 0 to 10V dc

0011 4 to 20 mA

Not Used

0100 1 to 5V dc

0101 0 to 20 mA

Not Used

000 Raw/Proportional Data

001 Engineering Units

010

Scaled for PID

(1)

(2)

(3)

011 Percent Range

Not Used

15 Enable Channel 1 Enabled

(1)

Any attempt to write a non-valid (not used) bit configuration into any selection field results in a module configuration error. See Configuration Errors on page 5-6.

(2)

If reserved bits are not equal to zero, a configuration error occurs.

(3)

This range is applicable to the PID function of the MicroLogix 1500 packaged controller, PLC, or SLC controllers. Logix controllers can use this or one of the other ranges for their PID functions.

Publication 1769-UM002B-EN-P - July 2005

Disabled

3-6 Module Data, Status, and Channel Configuration for the Input Modules

Enable/Disable Channel

This configuration selection lets each channel to be individually enabled.

TIP

When a channel is not enabled (0), no voltage or current input is provided to the controller by the A/D converter.

Input Filter Selection

The input filter selection field lets you select the filter frequency for each channel and provides system status of the input filter setting for analog input channels 0 through 3. The filter frequency affects the noise rejection characteristics, as explained below. Select a filter frequency considering acceptable noise and step response time.

Noise Rejection

The 1769-IF4 uses a digital filter that provides noise rejection for the input signals. The filter is programmable, allowing you to select from four filter frequencies for each channel. The digital filter provides the highest noise rejection at the selected filter frequency. A lower frequency (60 Hz versus 250 Hz) can provide better noise rejection but it increases channel update time. Transducer power supply noise, transducer circuit noise, or process variable irregularities may also be sources of normal mode noise.

Common Mode Rejection is better than 60 dB at 50 and 60 Hz, with the 50 and 60 Hz filters selected, respectively. The module performs well in the presence of common mode noise as long as the signals applied to the user plus and minus input terminals do not exceed the common mode voltage rating (± 10 V) of the module. Improper earth ground may be a source of common mode noise.

Channel Step Response

The selected channel filter frequency determines the channel’s step response. The step response is the time required for the analog input signal to reach 100% of its expected final value. This means that if an input signal changes faster than the channel step response, a portion of that signal will be attenuated by the channel filter.

Table 3.4 Filter Frequency and Step Response

Filter Frequency Cut-off Frequency Step Response

50 Hz 13.1 Hz 60 ms

60 Hz 15.7 Hz 50 ms

250 Hz 65.5 Hz 12 ms

500 Hz 131 Hz 6 ms

Publication 1769-UM002B-EN-P - July 2005

Module Data, Status, and Channel Configuration for the Input Modules 3-7

– – – – – –

Channel Cut-Off Frequency

The -3 dB frequency is the filter cut-off frequency. The cut-off frequency is defined as the point on the frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation. All input frequency components at or below the cut-off frequency are passed by the digital filter with less than 3 dB of attenuation. All frequency components above the cut-off frequency are increasingly attenuated as shown in the graphs below.

The cut-off frequency for each channel is defined by its filter frequency selection. Choose a filter frequency so that your fastest changing signal is below that of the filter’s cut-off frequency. The cut-off frequency should not be confused with the update time. The cut-off frequency relates to how the digital filter attenuates frequency components of the input signal. The update time defines the rate at which an input channel is scanned and its channel data word is updated.

Figure 3.2 Frequency Response Graphs

0 –20 –40 –60 –80 100

Gain (dB)

120 140 160 180 200

13.1 Hz

50 Hz Input Filter Frequency 60 Hz Input Filter Frequency

Gain (dB)

–20 –40 –60

–80 –100 –120 –140 –160 –180 –200

15.72 Hz

–3 dB

120

180

–3 dB

100

150

200

250

300

Frequency (Hz) Frequency (Hz)

240

300

360

0 –20 –40 –60 –80 100

Gain (dB)

120 140 160 180 200

65.5 Hz

250 Hz Input Filter Frequency 500 Hz Input Filter Frequency

131 Hz

–3 dB

500

1000

1500

–3 dB

250

–20 –40 –60 –80

–100

Gain (dB)

–120 –140 –160 –180

750

500

Frequency (Hz) Frequency (Hz)

900

1150

1300

–200

Publication 1769-UM002B-EN-P - July 2005

2000

2500

3000

3-8 Module Data, Status, and Channel Configuration for the Input Modules

Module Update Time and Scanning Process

The module update time is defined as the time required for the module to sample and convert the input signals of all enabled input channels and provide the resulting data values to the processor. Module update time can be calculated by adding the sum of all enabled channel times. Channel times include channel scan time, channel switching time, and reconfiguration time. The module sequentially samples the channels in a continuous loop.

Figure 3.3 Sequential Sampling

Channel 0 Disabled Channel 1 Disabled Channel 2 Disabled Channel 3 Disabled

Sample

Enabled Enabled Enabled Enabled

Channel 0

Sample

Channel 1

Sample

Channel 2

Table 3.5 shows the channel update times. The fastest module update time occurs when only one channel is enabled with a 500 Hz filter (4 ms). If more than one channel is enabled, the update time is faster if both channels have the same configuration. See the first example on page 3-9. The slowest module update time occurs when all four channels are enabled with different configurations. See the second example on page 3-9.

Table 3.5 Channel Update Time

Filter Frequency Channel Update Time

50 Hz 22 ms

60 Hz 19 ms

250 Hz 6 ms

500 Hz 4 ms

Channel Switching and Reconfiguration Times

Sample

Channel 3

Description Duration

Channel Switching Time

Channel-to-Channel Reconfiguration Time

Publication 1769-UM002B-EN-P - July 2005

The time it takes the module to switch from one channel to another.

The time it takes the module to change its configuration settings for a difference in configuration between one channel and another.

The table below provides the channel switching and reconfiguration times for a channel.

Table 3.6 Channel Switching and Reconfiguration Times

50 Hz 60 Hz 250 Hz 500 Hz

46 ms 39 ms 14 ms 10 ms

116 ms 96 ms 20 ms 8 ms

Module Data, Status, and Channel Configuration for the Input Modules 3-9

Examples of Calculating Module Update Time

EXAMPLE

1. Two Channels Enabled with Identical Configurations

The following example calculates the 1769-IF4 module update time for two channels enabled with the same configuration and a 500 Hz filter.

Module Update Time = [Ch 0 Update Time + Ch 0 Switching Time] + [Ch 1 Update Time + Ch 1 Switching Time]

28 = [4 ms + 10 ms] + [4 ms + 10 ms]

2. Three Channels Enabled with Different Configurations

The following example calculates the module update time for three channels with the following configurations:

• Channel 0: ±10V dc with 60 Hz filter

• Channel 1: ±10V dc with 500 Hz filter

• Channel 2: 4 to 20 mA with 250 Hz filter

Module Update Time =[Ch 0 Reconfiguration Time + Ch 0 Update Time + Ch 0 Switching Time]

[Ch 1 Reconfiguration Time + Ch 1 Update Time + Ch 1 Switching Time]

[Ch 2 Reconfiguration Time + Ch 2 Scan Time + Ch 2 Switching Time]

216 96 ms 19 ms 39 ms++[]8 ms 4 ms 10 ms++[]20 ms 6 ms 14 ms++[]++=

Input Type/Range Selection

This selection along with proper input wiring lets you configure each channel individually for current or voltage ranges and provides the ability to read the current range selections.

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3-10 Module Data, Status, and Channel Configuration for the Input Modules

Input Data Selection Formats

This selection configures channels 0 through 3 to present analog data in any of the following formats:

• Raw/Proportional Data

• Engineering Units

• Scaled-for-PID

• Percent Range

Raw/Proportional Data

The value presented to the controller is proportional to the selected input and scaled into the maximum data range allowed by the bit resolution of the A/D converter and filter selected. The full range for a ±10Vdc user input is -32767 to +32767. See Table 3.7 Valid Input Data on page 3-11.

Engineering Units

The module scales the analog input data to the actual current or voltage values for the selected input range. The resolution of the engineering units is dependent on the range selected and the filter selected. See Table 3.7 Valid Input Data on page 3-11.

Scaled-for-PID

The value presented to the controller is a signed integer with zero representing the lower user range and 16383 representing the upper user range. Allen-Bradley controllers, such as the MicroLogix 1500, use this range in their PID equations. The amount over and under user range (full scale range -410 to

16793) is also included. See Table 3.7 Valid Input Data on page 3-11.

Percent Range

The input data is presented as a percentage of the user range. For example, 0V to 10V dc equals 0% to 100%. See Table 3.7 on page 3-11.

TIP

The ±10V dc range does not support the percent user range data format.

Publication 1769-UM002B-EN-P - July 2005

Module Data, Status, and Channel Configuration for the Input Modules 3-11

Valid Input Data Word Formats/Ranges

The following table shows the valid formats and min./max. data ranges provided by the module.

Table 3.7 Valid Input Data

1769-IF4 Input Range

-10V to +10V dc Over 10.5V dc +11.0V dc Over-range 32767 (max.) 10500 (max.) 16793 (max.) N/A

0V to 5V dc Over 5.25V dc 5.5V dc Over-range 32767 (max.) 5250 (max.) 17202 (max.) 10500 (max.)

0V to 10V dc Over 10.5V dc 11.0V dc Over-range 32767 (max.) 10500 (max.) 17202 (max.) 10500 (max.)

Input Value Example

Data

+10.5V dc + 10.5V dc Over-range 32767 (max.) 10500 (max.) 16793 (max.) N/A

-10V to +10V dc +10.0V dc Normal 31206 10000 16383 N/A

0.0V dc Normal 0 0 8192 N/A

-10.0V dc Normal -31206 -10000 0 N/A

-10.5Vdc -10.5V dc Under-range -32767 (min.) -10500 (min.) -410 (min.) N/A

Under -10.5V dc -11.0V dc Under-range -32767 (min.) -10500 (min.) -410 (min.) N/A

5.25V dc 5.25V dc Over-range 32767 (max.) 5250 (max.) 17202 (max.) 10500 (max.)

0.0V dc to 5.0V dc 5.0V dc Normal 31206 5000 16383 10000

0.0V dc Normal 0 0 0 0

-0.5V dc -0.5V dc Under-range -3121 (min.) -500 (min.) -1638 (min.) -1000 (min.)

Under -0.5V dc -1.0V dc Under-range -3121 (min.) -500 (min.) -1638 (min.) -1000 (min.)

Input Range Condition

Raw/Propor tional Data

Decimal Range

Engineering Unit

Decimal Range

Scaled-forPID

Decimal Range

Percent Full Range

Decimal Range

+10.5V dc 10.5V dc Over-range 32767 (max.) 10500 (max.) 17202 (max.) 10500 (max.)

0.0V dc to 10.0V dc 10.0V dc Normal 31206 10000 16383 10000

0.0V dc Normal 0 0 0 0

-0.5V dc -0.5V dc Under-range -1560 (min.) -500 (min.) -819 (min.) -500 (min.)

Under -5.0V dc -1.0V dc Under-range -1560 (min.) -500 (min.) -819 (min.) -500 (min.)

4 mA to 20 mA Over 21.0 mA 22.0 mA Over-range 32767 (max.) 21000 (max.) 17407 (max.) 10625 (max.)

21.0 mA 21.0 mA Over-range 32767 (max.) 21000 (max.) 17407 (max.) 10625 (max.)

4.0 mA to 20.0 mA 20.0 mA Normal 31206 20000 16383 10000

4.0 mA Normal 6241 4000 0 0

3.2 mA 3.2 mA Under-range 4993 (min.) 3200 (min.) -819 (min.) -500 (min.)

Under 3.2 mA 0.0 mA Under-range 4993 (min.) 3200 (min.) -819 (min.) -500 (min.)

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3-12 Module Data, Status, and Channel Configuration for the Input Modules

Table 3.7 Valid Input Data

1769-IF4 Input Range

Input Value Example

Data

Input Range Condition

Raw/Propor tional Data

Decimal Range

Engineering Unit

Decimal Range

Scaled-forPID

Decimal Range

Percent Full Range

Decimal Range

1.0V to 5V dc Over 5.25V dc 5.5V dc Over-range 32767 (max.) 5250 17407 10625

+5.25V dc 5.25V dc Over-range 32767 (max.) 5250 17407 10625

1.0V to 5.0V dc 5.0V dc Normal 31206 5000 16383 10000

1.0V dc Normal 6243 1000 1 1

0.5V dc 0.5V dc Under-range 3121 (min.) 500 -2048 -1250

Under 0.5V dc 0.0V dc Under-range 3121 (min.) 500 -2048 -1250

0 mA to 20 mA Over 21.0 mA 22.0 mA Over-range 32767 21000 17202 10500

21.0 mA 21.0 mA Over-range 32767 21000 17202 10500

0.0 mA to 20.0 mA 20.0 mA Normal 31206 20000 16383 10000

0.0 mA Normal 0 0 0 0

Under 0.0 mA 0.0 mA Under-range 0 0 0 0

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Module Data, Status, and Channel Configuration for the Input Modules 3-13

Effective Resolution

The effective resolution for an input channel depends upon the filter frequency selected for that channel. The following tables provide the effective resolution for the four frequencies for each of the range selections.

Table 3.8 50Hz / 60Hz Effective Resolution

1769-IF4 Input Range

-10 to +10V dc

0 to +5V dc Sign +13

0 to +10V dc Sign +14

+4 to +20 mA

+1 to +5V dc Sign +13

0 to +20 mA Sign +14

Raw/Proportional Data Over the Full Input Range

Bits and Engineering Units Resolution

Sign +14

0.64 mV/ 2 counts

0.64 mV/ 4 counts

0.64 mV/ 2 counts

Sign +14

1.28 µA/ 2 counts

0.64 mV/ 4 counts

1.28 µA/ 2 counts

Decimal Range and Count Value

±32767 Count by 2

-3121 to +32767 Count by 4

-1560 to +32767 Count by 2

+4993 to +32767 Count by 2

+3121 to +32767 Count by 4

0 to +32767 Count by 2

Engineering Units Over the Full Input Range

Resolution Decimal

Range and Count Value

1.00 mV/ 1 count

2.00 µA/ 2 counts

1.00 mV/ 1 count

2.00 µA/ 2 counts

±10500 Count by 1

-500 to +5250 Count by 1

-500 to +10500 Count by 1

+3200 to +2100 Count by 2

+500 to +5250 Count by 1

0 to +21000 Count by 2

Scaled-For-PID Over the Full Input Range

Resolution Decimal

Range and Count Value

1.22 mV/ 1 count

0.92 mV/ 3 counts

1.22 mV/ 2 counts

1.95 µA/ 2 counts

0.73 mV/ 3 counts

2.44 µA/ 2 counts

-410 to +16793 Count by 1

-1638 to +17202 Count by 3

-819 to +17202 Count by 2

-819 to +17407 Count by 2

-2048 to +17407 Count by 3

0 to +17202 Count by 2

Percent Over the Full Input Range

Resolution Decimal

Range and Count Value

Not Applicable

1.00 mV/ 2 counts

1.00 mV/ 1 count

1.60 µA/ 1 count

0.80 mV/ 2 counts

2.00 µA/ 1 count

Not Applicable

-1000 to +10500 Count by 2

-500 to +10500 Count by 1

-500 to +10625 Count by 1

-1250 to +10625 Count by 2

0 to +10500 Count by 1

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3-14 Module Data, Status, and Channel Configuration for the Input Modules

Table 3.9 250Hz Effective Resolution

1769-IF4 Input Range

-10 to +10V dc

0 to +5V dc

0 to +10V dc

+4 to +20 mA

+1 to +5V dc

0 to +20 mA

Raw/Proportional Data Over the Full Input Range

Bits and Engineering Units Resolution

Sign +11

5.13 mV/

Decimal Range and Count Value

±32767 Count by 16

16 counts Sign +10

5.13 mV/ 32 counts

Sign +11

5.13 mV/ 16 counts

Sign +11

10.25 µA/ 16 counts

Sign +10

5.13 mV/ 32 counts

Sign +11

10.25 µA/

-3121 to +32767 Count by 32

-1560 to +32767 Count by 16

+4993 to +32767 Count by 2

+3121 to +32767 Count by 32

0 to +32767 Count by 16

16 counts

Engineering Units Over the Full Input Range

Resolution Decimal

Range and Count Value

6.00 mV/ 6 counts

±10500 Count by 6

-500 to +5250 Count by 6

6.00 mV/ 6 counts

-500 to +10500 Count by 6

11.00 µA/ 11 counts

+3200 to +2100 Count by 11

6.00 mV/ 6 counts

+500 to +5250 Count by 6

11.00 µA/ 11 counts

0 to +21000 Count by 11

Scaled-For-PID Over the Full Input Range

Resolution Decimal

Range and Count Value

6.10 mV/ 5 counts

-410 to +16793 Count by 5

5.19 mV/ 17 counts

-1638 to +17202 Count by 17

5.49 mV/ 9 counts

-819 to +17202 Count by 9

10.74 µA/

-819 to +17407

11 counts

5.37 mV/ 22 counts

Count by 11

-2048 to +17407 Count by 22

10.99 µA/ 9 counts

0 to +17202 Count by 9

Percent Over the Full Input Range

Resolution Decimal

Range and Count Value

Not Applicable

5.50 mV/ 11 counts

Not Applicable

-1000 to +10500 Count by 11

6.00 mV/ 6 counts

-500 to +10500 Count by 6

11.20 µA/ 7 counts

-500 to +10625 Count by 7

5.20 mV/ 13 counts

-1250 to +10625 Count by 13

12.00 µA/ 6 counts

0 to +10500 Count by 6

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Module Data, Status, and Channel Configuration for the Input Modules 3-15

Table 3.10 500 Hz Effective Resolution

1769-IF4 Input Range

-10 to +10V dc

0 to +5V dc

0 to +10V dc

+4 to +20 mA

+1 to +5V dc

0 to +20 mA

Raw/Proportional Data Over the Full Input Range

Bits and Engineering Units Resolution

Sign +9

20.51 mV/

Decimal Range and Count Value

±32767 Count by 64

64 counts Sign +8

20.51 mV/ 128 counts

Sign +9

20.51 mV/ 64 counts

Sign +9

41.02 µA/ 64 counts

Sign +8

20.51 mV/ 128 counts

Sign +9

41.02 µA/

-3121 to +32767 Count by 128

-1560 to +32767 Count by 64

+4993 to +32767 Count by 64

+3121 to +32767 Count by 128

0 to +32767 Count by 64

64 counts

Engineering Units Over the Full Input Range

Resolution Decimal

Range and Count Value

21.00 mV/ 21 counts

±10500 Count by 21

-500 to +5250 Count by 21

21.00 mV/ 21 counts

-500 to +10500 Count by 21

42.00 µA/ 42 counts

+3200 to +2100 Count by 42

21.00 mV/ 21 counts

+500 to +5250 Count by 21

42.00 µA/ 42 counts

0 to +21000 Count by 42

Scaled-For-PID Over the Full Input Range

Resolution Decimal

Range and Count Value

20.75 mV/ 17 counts

-410 to +16793 Count by 17

20.75 mV/ 68 counts

-1638 to +17202 Count by 68

20.75 mV/ 34 counts

-819 to +17202 Count by 34

41.02 µA/ 42 counts

-819 to +17407 Count by 42

20.75 mV/ 84 counts

-2048 to +17407 Count by 84

41.51 µA/

0 to +17202 Count by 34

34 counts

Percent Over the Full Input Range

Resolution Decimal

Range and Count Value

Not Applicable

21.00 mV/ 42 counts

Not Applicable

-1000 to +10500 Count by 42

21.00 mV/ 21 counts

-500 to +10500 Count by 21

41.60 µA/ 26 counts

-500 to +10625 Count by 26

20.8 mV/ 52 counts

-1250 to +10625 Count by 52

42.00 µA/ 21 counts

0 to +10500 Count by 21

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3-16 Module Data, Status, and Channel Configuration for the Input Modules

1769-IF8 Input Module Addressing

slot e

Input Image

File

slot e

Output Image

File

slot e

Configuration

File

The1769-IF8 memory map shows the output, input, and configuration tables for the 1769-IF8.

Figure 3.4 1769-IF8 Memory Map

Memory Map

Channel 0 Data Word Word 0

Word 1Channel 1 Data Word

Input Image 12 words

Channel 3 Data Word Word 3

Channel 4 Data Word Word 4

Channel 5 Data Word Word 5 Channel 6 Data Word Word 6 Channel 7 Data Word Word 7

Time Stamp Value Word Word 8

General Status Bits Word 9, bits 0-7

High-/Low-Alarm & Over-/Under-Range Word 10

High-/Low-Alarm & Over-/Under-Range Word 11

Word 2Channel 2 Data Word

Output Image 1 word

Configuration File 50 words

Clear Latched Alarm Bits Word 0

Real Time Sample Rate Word 0

Enable Time Stamp Word 1, bit 15

Channel 0 Configuration Words Words 2-7

Channel 1 Configuration Words Words 8-13

Channel 2 Configuration Words Words 14-19

Channel 3 Configuration Words Words 20-25

Channel 4 Configuration Words Words 26-31

Channel 5 Configuration Words Words 32-37

Channel 6 Configuration Words Words 38-43

Channel 7 Configuration Words Words 44-49

Publication 1769-UM002B-EN-P - July 2005

Bit 15 Bit 0

Module Data, Status, and Channel Configuration for the Input Modules 3-17

1769-IF8 Input Image

The 1769-IF8 input image file represents data words and status bits. Input words 0 through 7 hold the input data that represents the value of the analog inputs for channels 0 through 7. These data words are valid only when the channel is enabled and there are no errors. Input words 9 and 11 hold the status bits. To receive valid status information, the channel must be enabled.

TIP

You can access information in the input image file using the programming software configuration screen.

1769-IF8 Output Image

The 1769-IF8 output image file contains the clear alarm control bits for the high- and low-alarm bits on each input channel. These bits are used to clear alarms when alarms are latched.

TIP

You can access information in the output image file using the programming software configuration screen.

1769-IF8 Configuration File

The configuration file contains information that you use to define the way a specific channel functions. The configuration file is explained in more detail in 1769-IF8 Configuration Data File on page 3-20.

TIP

Not all controllers support program access to the configuration file. Refer to your controller’s user manual.

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3-18 Module Data, Status, and Channel Configuration for the Input Modules

1769-IF8 Input Data File

The input data table lets you access analog input module read data for use in the control program, via word and bit access. The data table structure is shown in the table below. For each input module, slot x, words 0-7 in the input data file contain the analog values of the inputs.

Table 3.11 1769-IF8 Input Data Table

Bit Position

1514131211109876543210

Word

0 SGN Analog Input Data Channel 0

1 SGN Analog Input Data Channel 1

2 SGN Analog Input Data Channel 2

3 SGN Analog Input Data Channel 3

4 SGN Analog Input Data Channel 4

5 SGN Analog Input Data Channel 5

6 SGN Analog Input Data Channel 6

7 SGN Analog Input Data Channel 7

8 Nu Time Stamp Value

9 Nu NuNuNuNuNuNuNuS7S6S5S4S3S2S1S0

10 L3 H3 U3 O3 L2 H2 U2 O2 L1 H1 U1 O1 L0 H0 U0 O0

11 L7 H7 U7 O7 L6 H6 U6 O6 L5 H5 U5 O5 L4 H4 U4 O4

1769-IF8 Input Data Values

Words 0 through 7 contain the converted analog input data from the field device. The most significant bit (MSB) is the sign bit, which is in two’s complement format. (Nu indicates not used with the bit set to 0.)

General Status Bits (S0 through S7)

Word 9, bits 0 through 7 contain the general operational status bits for input channels 0 through 7. If set (1), these bits indicate an error associated with that channel. The over- and under-range bits and the high- and low-alarm bits for channels 0 through 7 are logically ORed to the appropriate general status bit.

Low Alarm Flag Bits (L0 through L7)

Word 10, bits 3, 7, 11, and 15 and Word 11, bits 3, 7, 11, 15 contain the low alarm flag bits for input channels 0 through 7. If set (1), these bits indicate the input signal is outside the user-defined range. The module continues to convert analog data to minimum full-range values. The bit is automatically reset (0) when the low alarm condition clears, unless the channel’s alarm bits are latched. If the channel’s alarm bits are latched, a set (1) low alarm flag bit clears via the corresponding Clear Alarm Latch bit in your output data file.

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Module Data, Status, and Channel Configuration for the Input Modules 3-19

High Alarm Flag Bits (H0 through H7)

Word 10, bits 2, 6, 10, 14 and Word 11, bits 2, 6, 10, 14 contain the high alarm flag bits for input channels 0 through 7 and applies to all input types. If set (1), the input signal is output the user-defined range. The module continues to convert analog data to maximum full-range values. The bit is automatically reset (0) when the high alarm condition clears, unless the channel’s alarm bits are latched. If the channel’s alarm bits are latched, a set (1) high alarm flag bit clears via the corresponding Clear Alarm Latch bit in your output data file.

Over-Range Flag Bits (O0 through O7)

Over-range bits for channels 0 through 7 are contained in Word 10, bits 0, 4, 8, 12 and Word 11, bits 0, 4, 8, 12. They apply to all input types. When set (1), this bit indicates input signals beyond the normal operating range. However, the module continues to convert analog data to the maximum full range value. The bit is automatically reset (0) by the module when the over-range condition is cleared and the data value is within the normal operating range.

Under-Range Flag Bits (U0 through U7)

Under-range bits for channels 0 through 7 are contained in Word 10, bits 1, 5, 9, 13 and Word 11, bits 1, 5, 9, 13. They apply to all input types. When set (1), this bit indicates input signals below the normal operating range. It may also indicate an open circuit condition, when the module is configured for the 4 to 20 mA range. However, the module continues to convert analog data to the minimum full range value. The bit is automatically reset (0) by the module when the under-range condition is cleared and the data value is within the normal operating range.

Time Stamp Value (Word 8)

The 1769-IF8 supports a 15-bit rolling timestamp that is updated during each new sampling period of the analog inputs. The timestamp has a 1 ms resolution. The timestamp value is placed in the input image file, word 8, for each module input data update (if the timestamp function is enabled). Enable and/or disable this timestamp in the configuration file.

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3-20 Module Data, Status, and Channel Configuration for the Input Modules

1769-IF8 Output Data File

The output data table lets you access analog output module write data for use in the control program, via word and bit access. The data table structure is shown in the table below.

Table 3.12 1769-IF8 Output Data Table

Bit Position

15 14131211109876543210

Word

(1)

CL Lx = Cancel Low Process Alarm Latch x. This lets you individually cancel each low process alarm latch. Cancel = 1.

(2)

CL Hx = Cancel High Process Alarm Latch x. This lets you individually cancel each high process alarm latch.

(2)

CL L6CL H6CL L5CL H5CL L4CL H4CL L3CL H3CL L2CL H2CL L1CL H1CL L0CL

These bits are written during run mode to clear any latched low- and high-process alarms. The alarm is unlatched when the unlatch bit is set (1) and the alarm condition no longer exists. If the alarm condition persists, then the unlatch bit has no effect until the alarm condition no longer exists. You need to keep the unlatch bit set until verification from the appropriate input channel status word that the alarm status bit has cleared (0). Then you need to reset (0) the unlatch bit. The module will not latch an alarm condition if a transition from no alarm to alarm occurs while a channel’s clear latch bit is set.

1769-IF8 Configuration Data

The configuration file lets you determine how each individual input channel will operate. Parameters such as the input type and data format are set up using

File

this file. This data file is writable and readable. The default value of the configuration data table is all zeros. The structure of the channel configuration file is shown below.

Table 3.13 1769-IF8 Configuration Data Table

Bit Position

Word

0 Real Time Sample Value 1 ETS Reserved 2EC ReservedEAAL

3 Reserved Inpt Dta Fm Chl0 Reserved Inpt Tp/RngeSel Chl0 4 S Process Alarm High Data Value Channel 0 5 S Process Alarm Low Data Value Channel 0 6 S Alarm Dead Band Value Channel 0 7 Reserved 8EC ReservedEAAL

9 Reserved Inpt Dta Fm Chl1 Reserved Inpt Tp/RngeSel Chl1 10 S Process Alarm High Data Value Channel 1 11 S Process Alarm Low Data Value Channel 1

15 14 13 1211109 8 765 43210

(1)

Reserved Input Filter Sel Chl0

Reserved Inpt Filter Sel Chl1

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Module Data, Status, and Channel Configuration for the Input Modules 3-21

Table 3.13 1769-IF8 Configuration Data Table

12 S Alarm Dead Band Value Channel 1 13 Reserved 14 EC Reserved EA AL

(1)

Reserved Input Filter Sel Chl2

15 Reserved Inpt Dta Fm Chl2 Reserved Inpt Tp/RngeSel Chl2 16 S Process Alarm High Data Value Channel 2 17 S Process Alarm Low Data Value Channel 2 18 S Alarm Dead Band Value Channel 2 19 Reserved 20 EC Reserved EA AL

(1)

Reserved Input Filter Sel Chl3

21 Reserved Inpt Dta Fm Chl3 Reserved Inpt Tp/RngeSel Chl3 22 S Process Alarm High Data Value Channel 3 23 S Process Alarm Low Data Value Channel 3 24 S Alarm Dead Band Value Channel 3 25 Reserved 26 EC Reserved EA AL

(1)

Reserved Input Filter Sel Chl4

27 Reserved Inpt Dta Fm Chl4 Reserved Inpt Tp/RngeSel Chl4 28 S Process Alarm High Data Value Channel 4 29 S Process Alarm Low Data Value Channel 4 30 S Alarm Dead Band Value Channel 4 31 Reserved 32 EC Reserved EA AL

(1)

Reserved Input Filter Sel Chl5

33 Reserved Inpt Dta Fm Chl5 Reserved Inpt Tp/RngeSel Chl5 34 S Process Alarm High Data Value Channel 5 35 S Process Alarm Low Data Value Channel 5 36 S Alarm Dead Band Value Channel 5 37 Reserved 38 EC Reserved EA AL

(1)

Reserved Input Filter Sel Chl6

39 Reserved Inpt Dta Fm Chl6 Reserved Inpt Tp/RngeSel Chl6 40 S Process Alarm High Data Value Channel 6 41 S Process Alarm Low Data Value Channel 6 42 S Alarm Dead Band Value Channel 6 43 Reserved 44 EC Reserved EA AL

(1)

Reserved Input Filter Sel Chl7

45 Reserved Inpt Dta Fm Chl7 Reserved Inpt Tp/RngeSel Chl7 46 S Process Alarm High Data Value Channel 7 47 S Process Alarm Low Data Value Channel 7 48 S Alarm Dead Band Value Channel 7 49 Reserved

(1)

CompactLogix L43 controllers will be able to support these interrupts.

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3-22 Module Data, Status, and Channel Configuration for the Input Modules

The configuration file can also be modified through the control program, if supported by the controller. The structure and bit settings are shown in Channel Configuration on page 3-22.

Channel Configuration

Each channel’s configuration words consist of bit fields, the settings of which determine how the channel operates. See the table below and the descriptions that follow for valid configuration settings and their meanings. The default bit status of the configuration file is all zeros.

Table 3.14 Bit Definitions for Channel Configuration Words

Define To Select Make these bit settings

Input Filter Selection/

-3 dB Frequency

Enable Interrupt

Process Alarm Latch

Enable Process Alarms

Enable Channel

60 Hz 50 Hz 10 Hz 250 Hz 500 Hz Enable Disable 0 Enable 1 Disable 0

Enable 1 Disable 0

15 14 13 12 11 10 9 8 7-4 3 2 1 0

0000 0001 0010 0011 0100

Publication 1769-UM002B-EN-P - July 2005

Table 3.15 Bit Definitions for Input Range and Input Data

Define Indicate this These bit settings

15-11 109 8 7-4 3210

Input Range Select

Input Data Format Select

-10 to +10V dc 0 to 5V dc 0 to 10V dc 4 to 20 mA 1 to 5V dc 0 to 20 mA Raw/Proportional

Counts Engineering Units 0 0 1 Scaled for PID 0 1 0 Percent Range 0 1 1

000

0000 0001 0010 0011 0100 0101

Module Data, Status, and Channel Configuration for the Input Modules 3-23

Enable/Disable Channel

This configuration selection lets each channel to be individually enabled.

TIP

When a channel is not enabled (0), no voltage or current input is provided to the controller by the A/D converter.

Input Filter Selection

Noise Rejection

The 1769-IF8 uses a digital filter that provides noise rejection for the input signals. The filter is programmable, allowing you to select from four filter frequencies for each channel. The digital filter provides -3 db (50% amplitude) attenuation at the selected filter frequency. A lower frequency (60 Hz versus 250 Hz) can provide better noise rejection but it increases channel update time. Transducer power supply noise, transducer circuit noise, or process variable irregularities may also be sources of normal mode noise.

Channel Step Response

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3-24 Module Data, Status, and Channel Configuration for the Input Modules

Channel Cut-Off Frequency

The cut-off frequency for each channel is defined by its filter frequency selection and is equal to the filter frequency setting. Choose a filter frequency so that your fastest changing signal is below that of the filter’s cut-off frequency. The cut-off frequency should not be confused with the update time. The cut-off frequency relates to how the digital filter attenuates frequency components of the input signal. The update time defines the rate at which an input channel is scanned and its channel data word is updated.

Module Update Time and Scanning Process

The 1769-IF8 uses two parallel sampling loops as shown in Figure 3.5 to update the entire module (all 8 channels) in an amount of time equal to only four channel update times. The module performs parallel channel sampling on pairs of inputs. Channels 0 and 4 are a pair. The other input channel pairs are 1 and 5, 2 and 6, and 3 and 7.

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Module Data, Status, and Channel Configuration for the Input Modules 3-25

Figure 3.5 Sequential Sampling

Disable

Disable Disable Disable

Sample

Enable

Channel 0

Disable Disable Disable Disable

Sample

Channel 4

Enable

Wait

RTS

Sample

Channel 1

Sample

Channel 5

Enable

Disable

Sample

Channel 2

Sample

Channel 6

Update

Input Data

Module update time is calculated as follows:

• Slowest channel update time of pair 0 and 4 (determined by the filter

setting selected for each channel and the channel update times from Table 3.16 - channel update time for a channel that is not enabled is equal to 0)

Sample

Channel 3

Sample

Channel 7

PLUS

• Slowest channel update time of pair 1 and 5

PLUS

• Slowest channel update time of pair 2 and 6

PLUS

• Slowest channel update time of pair 3 and 7

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3-26 Module Data, Status, and Channel Configuration for the Input Modules

If you use real-time sampling, the user-configured sample rate is used as the module update time.

Table 3.16 Filter Frequency and Update Times

EXAMPLE

Filter Frequency Update Time per

Channel

Update Time per

Module

(1)

10 Hz 100 ms 400 ms

50 Hz 30 ms 120 ms

60 Hz 30 ms 120 ms

250 Hz 9 ms 36 ms

500 Hz 6 ms 24 ms

(1)

Module update time applies if you use all channel pairs and all enabled channels, and all the enabled channels use the filter frequency from the first column.

Examples of Calculating Module Update Time

1. Two Channels Enabled with Identical Filter Setting, But Not a Channel Pair

The following example calculates the 1769-IF8 module update time for two channels enabled with any configuration and a 500 Hz filter but the enabled channels are not a channel pair.

• Channel 0: ±10V dc with 500 Hz filter

• Channel 1: 0…10V dc with 500 Hz filter

Module Update Time = [Greater of Channel 0 Update Time or Channel 4 Update Time] + [Greater of Channel 1 Update Time or Channel 5 Update Time]

12 ms = [Greater of 6 ms or 0 ms] + [Greater of 6 ms or 0 ms]

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Module Data, Status, and Channel Configuration for the Input Modules 3-27

EXAMPLE

2. Two Channels Enabled with Different Filter Settings, But are a Channel Pair

The following example calculates the 1769-IF8 module update time for two channels enabled with any configuration, with different filter settings, but are a channel pair.

• Channel 0: ±10V dc with 60 Hz filter

• Channel 4: 0…10V dc with 500 Hz filter

Module Update Time = [Greater of Channel 0 Update Time or Channel 4 Update Time]

30 ms = [Greater of 30 ms or 6 ms]

IMPORTANT

Configuring the 1769-IF8 module to take advantage of channel pairs can result in module update times that are significantly faster than configuring the 1769-IF8 modules without such channel assignment optimization.

Input Type/Range Selection

This selection along with proper input wiring lets you configure each channel individually for current or voltage ranges and provides the ability to read the configured range selections.

Input Data Selection Formats

This selection configures channels 0 through 3 to present analog data in any of the following formats:

• Raw/Proportional Data

• Engineering Units

• Scaled-for-PID

• Percent Range

Raw/Proportional Data

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3-28 Module Data, Status, and Channel Configuration for the Input Modules

Engineering Units

Scaled-for-PID

16793) is also included. See Table 3.17 Valid Input Data on page 3-28.

Percent Range

The input data is presented as a percentage of the user range. For example, 0V to 10V dc equals 0% to 100%. See Table 3.17 on page 3-28.

Valid Input Data Word Formats/Ranges

The following table shows the valid formats and min./max. data ranges provided by the module.

Table 3.17 Valid Input Data

1769-IF8 Normal Operating Input Range

-10V to +10V dc

0V to 5V dc 0.0V to 5.25V -27068 to

0V to 10V dc 0.0V to 10.5V -29788 to

4 mA to 20 mA

1.0V to 5V dc 0.5V to 5.25V 500 to 5250 -2048 to

Full Range (Includes amounts Over and Under Normal Operating Range)

+10.5V to -10.5V -32767 to

3.2 mA to 21 mA

Raw/Pro portional Data

+32767

-32767 to +32767

Engineering Units

Full Range Normal

Operating Range

-10500 to +10500

0 to 5250

0 to 10500

0 to 16383

3200 to 21000

Scaled-for-PID Percent

Full Range Normal

-410 to 16793 -100 to

0 to 17202

-819 to +17407

17407

Operating Range

+100%

0 to 100%

Full Range

-105.00 to

105.00%

0 to

105.00%

-5.00 to +106.25%

-12.50 to +106.25%

0 mA to 20 mA

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0 mA to 21 mA 0 to 21000 0 to 17202 0.00 to

105.00%

Module Data, Status, and Channel Configuration for the Input Modules 3-29

1769-IF8 Real Time Sampling

This parameter instructs the module how often to scan its input channels and obtain all available data. After the channels are scanned, the module places the data into the Input Data file. This feature is applied on a module-wide basis.

During module configuration, you specify a Real Time Sampling (RTS) period by entering a value into Word 0 of the Configuration Data file. This value entered in Word 0 can be in the range of 0 to 5000 and indicates the sampling rate the module will use in 1 ms increments.

If you enter a 0 for the Real Time Sample Rate, the module should scan its inputs at as fast a rate as possible, controlled by the number of enabled channels and the filter setting selected for those channels.

The module compares the Real Time Sample Rate value entered in Word 0 of the Configuration Data file with a calculated module update time, again based on the number of enabled channels and the filter setting selected for those channels. If the value entered for the Real Time Sample Rate is smaller than the calculated module update time, the module indicates a configuration error.

The longest Real Time Sample Rate supported by the 1769-IF8 is 5 s, the maximum value for Word 0 of the Configuration Data file is 5000 decimal.

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3-30 Module Data, Status, and Channel Configuration for the Input Modules

1769-IF8 Process Alarms

Process alarms alert you when the module has exceeded configured high or low limits for each channel. You can latch process alarms. These are set at two user configurable alarm trigger points:

• Process Alarm High

• Process Alarm Low

Each input channel’s process alarms are controlled by bits in the Configuration Data file. Enable alarms for a channel by setting (1) the EA bit for that channel. Set the AL bit (1) for a channel to enable the alarm latching.

Each channel’s process alarm high data value and process alarm low data value are set by entering values in the corresponding words of the Configuration Data file for that channel.

The values entered for a channel’s process alarm data values must be within the normal operating data range as set by the input Data Format selected for that channel. If a process alarm data value is entered that is outside the normal operating data range set for a channel, the module indicates a configuration error.

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Module Data, Status, and Channel Configuration for the Input Modules 3-31

Alarm Deadband

You may configure an Alarm Deadband to work with the process alarms. The deadband lets the process alarm status bit to remain set, despite the alarm condition disappearing, as long as the input data remains within the deadband of the process alarm.

Figure 3.6 shows input data that sets each of the two alarms at some point during module operation. In this example, Latching is disabled; therefore, each alarms turns OFF when the condition that caused it to set ceases to exist.

Figure 3.6 Alarm Deadbands

High

Low

High alarm turns ON

Low alarms turns ON

High alarm turns OFF

Normal input range

Low alarms turns OFF

Alarm deadbands

43153

The value entered for a channel’s alarm deadband value must be within the normal operating data range as set by the Input Data Format selected for that channel. If an alarm deadband value is entered that is outside the normal operating data range set for a channel, the module indicates a configuration error.

The module also checks for an alarm deadband value that is less than 0 or large enough to exceed one or both of the channel’s full range limits. When one of these conditions occurs, the module changes the alarm deadband value that is in violation to one that is allowed. A deadband value less than 0 is set at 0. A deadband value that when added to the process alarm low data value or subtracted from the process alarm high data value results in a value that exceeds the full range limits of the channel is adjusted to the first, smaller value that eliminates this full range violation.

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3-32 Module Data, Status, and Channel Configuration for the Input Modules

Notes:

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Chapter

Module Data, Status, and Channel Configuration for the Output Modules

This chapter examines the analog output module’s output data file, input data file, channel status, and channel configuration words.

1769-OF2 Output Module Memory Map

slot e

Input Image

File

slot e

Output Image

File

slot e

Configuration

File

(1) See page 21.

Input Image

Output Image

Configuration File

6 words

The 1769-OF2 memory map shows the output, input, and configuration tables for the 1769-OF2.

Figure 4.1 1769-OF2 Memory Map

Memory Map

Diagnostic and Status Bits

Over- and Under-range Bits

Channel 0 Output Data Echo Channel 1 Output Data Echo

Channel 0 Data Word Channel 1 Data Word

Channel 0 Configuration Word Channel 1 Configuration Word

Channel 0 Fault Value Word

Channel 0 Program Idle Mode Word

Channel 1 Fault Value Word

Channel 1 Program Idle Mode Word

Bit 15 Bit 0

(1)

Word 0, bits 0-1, 12-15 Word 1, bits 12-15

Word 2 Word 3

Word 0 Word 1

Word 2 Word 3 Word 4 Word 5

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4-2 Module Data, Status, and Channel Configuration for the Output Modules

1769-OF2 Output Data File

1769-OF2 Input Data File

The structure of the output data file is shown in the table below. Words 0 and 1 contain the converted analog output data for channels 0 and 1, respectively. The most significant bit is the sign bit.

Table 4.1 1769-OF2 Output Data Table

Word/Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Word 0 SGN Analog Output Data Channel 0

Word 1 SGN Analog Output Data Channel 1

This data table file provides immediate access to channel diagnostic information and analog output data at the module for use in the control program. To receive valid data, you must enable the channel. The data table structure is described below.

Table 4.2 1769-OF2 Input Data Table

Word/Bit15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Word 0 D0 H0 D1 H1 Not Used (bits set to 0) S1 S0

Word 1 U0 O0 U1 O1 Bits 0 - 11 set to 0

Word 2 SGN Channel 0 - Output Data Loopback/Echo

Word 3 SGN Channel 1 - Output Data Loopback/Echo

1769-OF2 Diagnostic Bits (D0 and D1)

When set (1), these bits indicate a broken output wire or high load resistance (not used on voltage outputs). Bit 15 represents channel 0; bit 13 represents channel 1.

1769-OF2 Hold Last State Bits (H0 and H1)

These bits indicate when channel 0 (bit 14) or channel 1 (bit 12) is in a hold last state condition. When one of these bits is set (1), the corresponding channel is in the hold state. Output data will not change until the condition which caused the hold last state to occur is removed. The bit is reset (0) for all other conditions.

TIP

MicroLogix 1500 controllers do not support the hold last state function. Refer to your controller’s user manual for details.

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Module Data, Status, and Channel Configuration for the Output Modules 4-3

1769-OF2 Over-Range Flag Bits (O0 and O1)

Over-range bits for channels 0 and 1 are contained in word 1, bits 14 and 12. When set, the over-range bit indicates that the controller is attempting to drive the analog output above its normal operating range. However, the module continues to convert analog output data to a maximum full range value. The bit is automatically reset (0) by the module when the over-range condition is cleared (the output is within the normal operating range). The over-range bits apply to all output ranges. Refer to Table 4.5 1769-OF2 Valid Output Data Table on page 4-12 to view the normal operating and over-range areas.

1769-OF2 Under-Range Flag Bits (U0 and U1)

Under-range bits for channels 0 and 1 are contained in word 1, bits 15 and 13. When set (1), the under-range bit indicates that the controller is attempting to drive the analog output below its normal operating range. However, the module continues to convert analog output data to a minimum full range value. The bit is automatically reset (0) by the module when the under-range condition is cleared (the output is within the normal operating range). The under-range bits apply to all output ranges. Refer to Table 4.5 1769-OF2 Valid Output Data Table on page 4-12 to view the normal operating and under-range areas.

1769-OF2 General Status Bits (S0 and S1)

Word 0, bits 0 and 1 contain the general status information for output channels 0 and 1. If set (1), these bits indicate an error associated with that channel. The over-range and under-range bits and the diagnostic bit are logically ORed to this position.

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4-4 Module Data, Status, and Channel Configuration for the Output Modules

1769-OF2 Output Data Loopback/Echo

Words 2 and 3 provide output loopback/data echo through the input array for channels 0 and 1, respectively. The value of the data echo is the analog value currently being converted on-board the module by the D/A converter. This ensures that the logic-directed state of the output is true. Otherwise, the state of the output could vary depending on controller mode.

Under normal operating conditions, the data echo value is the same value that is being sent from the controller to the output module. Under abnormal conditions, the values may differ. For example:

1. During run mode, the control program could direct the module to a value over or under the defined full range. In that case, the module raises the over- or under-range flag and continues to convert and data echo up to the defined full range. However, upon reaching either the maximum upper or lower full range value, the module stops converting and echoes back that maximum upper or lower full range value, not the value being sent from the controller.

2. During program or fault mode with Hold Last State or User-Defined Value selected, the module echoes the hold last value or alternate value you selected. For more information on the hold last and user-defined values, see 1769-OF2 Fault Value (Channel 0 and 1) on page 4-11 and 1769-OF2 Program/Idle Value (Channel 0 and 1) on page 4-11.

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Module Data, Status, and Channel Configuration for the Output Modules 4-5

1769-OF2 Configuration

The configuration file lets you determine how each individual output channel will operate. Parameters such as the output type/range and data format are set

Data File

up using this file. The configuration data file is writable and readable. The default value for the configuration data file is all zeros. The structure of the channel configuration file is explained below. Words 0 and 1 are the channel configuration words for channels 0 and 1. They are described in 1769-OF2 Channel Configuration on page 4-6. Words 2 through 5 are explained beginning on page 4-11.

Table 4.3 1769-OF2 Configuration Data Table

Word/Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Word 0 E Output Data Format

Select Channel 0

Word 1 E Output Data Format

Select Channel 1

Word 2 S Fault Value - Channel 0

Word 3 S Program (Idle) Value - Channel 0

Word 4 S Fault Value - Channel 1

Word 5 S Program (Idle) Value - Channel 1

(1)

The ability to change these values using your control program is not supported by all controllers. Refer to your controller manual for details.

Output Type/Range

Select Channel 0

Output Type/Range

Select Channel 1

Not Used

(set to 0)

Not Used

(set to 0)

(1)

FM0 PM0 Not Used

(set to 0)

FM1 PM1 Not Used

(set to 0)

PFE0

PFE1

The configuration file can also be modified through the control program, if supported by the controller. The structure and bit settings are shown in 1769-OF2 Channel Configuration on page 4-6.

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4-6 Module Data, Status, and Channel Configuration for the Output Modules

1769-OF2 Channel Configuration

Both channel configuration words (0 and 1) consist of bit fields, the settings of which determine how the corresponding channel operates. See the table below and the descriptions that follow for valid configuration settings and their meanings.

Table 4.4 1769-OF2 Bit Definitions for Channel Configuration Words 0 and 1

Bit(s) Define These bit settings Indicate this

1514131211109876543210

0 Program/Idle to

Fault Enable

1 Reserved

2 Program/Idle

Mode

0 Program Mode Hold Last

1 Program Mode

0 Program Mode Data

Applied

1 Fault Mode Data Applied

Reserved

State

User-Defined Value

3 Fault Mode

0 Fault Mode Hold Last

State

1 Fault Mode User-Defined

Value

4-7 Reserved

8-11 Output

Type/Range Select

Reserved

0000 -10V dc to +10V dc

0001 0 to 5V dc

Not Used

(1)

0010 0 to 10V dc

0011 4 to 20 mA

0100 1 to 5V dc

0101 0 to 20 mA

(2)

(3)

12-14 Output Data

Format Select

Not Used

000 Raw/Proportional Data

001 Engineering Units

010

Scaled-for-PID

011 Percent Range

(2)

Enable Channel 1

Not Used

Enabled

(1)

If reserved bits are not equal to zero, a configuration error occurs.

(2)

Any attempt to write a non-valid (not used) bit configuration into any selection field results in a module configuration error. See Configuration Errors on page 5-6.

(3)

This range is applicable to the PID function of the MicroLogix 1500 packaged controller, PLC, or SLC controllers. Logix controllers can use this or one of the other ranges for their PID functions.

Disabled

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Module Data, Status, and Channel Configuration for the Output Modules 4-7

1769-OF2 Enable/Disable Channel

This configuration selection (bit 15) lets each channel to be individually enabled.

TIP

A channel that is not enabled has zero voltage or current at its terminal.

1769-OF2 Output Data Format Selection

This selection configures each channel to interpret data presented to it by the controller in any of the following formats:

• Raw/Proportional Data

• Engineering Units

• Scaled-for-PID

• Percent Full Range

1769-OF2 Raw/Proportional Data

The control program presents the maximum raw data value allowed by the bit resolution of the D/A converter. The full range for a ±10V dc user input is

-32767 to +32767. See Table 4.5 1769-OF2 Valid Output Data Table on page 4-12.

1769-OF2 Engineering Units

The control program presents an engineering data value to the module within the current or voltage range allowed by the D/A converter. The module then scales the data to the appropriate analog output value for the selected user range. See Table 4.5 1769-OF2 Valid Output Data Table on page 4-12.

1769-OF2 Scaled-for-PID

The control program presents an integer value to the module, with zero representing the lower user range and 16383 representing the upper user range, for conversion by the D/A converter. The module then scales this data to the approximate analog output value for the selected user range. See Table 4.5 1769-OF2 Valid Output Data Table on page 4-12.

TIP

Allen-Bradley controllers, such as the MicroLogix 1500, use this range in their PID equations for controlled process outputs.

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4-8 Module Data, Status, and Channel Configuration for the Output Modules

1769-OF2 Percent Full Range

The control program presents the analog output data to the module as a percent of the full analog output range (for example, valve 50% open). The module scales this data to the appropriate analog output value for the selected user range. For example, 0 to 100% equals 0 to 10V dc. See Table 4.5 1769-OF2 Valid Output Data Table on page 4-12.

TIP

The ±10V dc range does not support percent full range.

1769-OF2 Output Type/Range Selection

This selection, along with proper output wiring, lets you configure each output channel individually for current or voltage ranges, and provides the ability to read the range selection.

1769-OF2 Fault Mode (FM0 and FM1)

This configuration selection provides individual fault mode selection for analog output channels 0 (word 0, bit 3) and 1 (word 1, bit 3). When this selection is disabled [the bit is reset (0)] and the system enters the fault mode, the module holds the last output state value. This means that the analog output remains at the last converted value prior to the condition that caused the system to enter the fault mode.

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IMPORTANT

TIP

Hold last state is the default condition for the 1769-OF2 during a control system run-to-fault mode change.

MicroLogix 1500™ does not support the analog output module’s default hold last state function and resets analog outputs to zero when the system enters the fault mode.

Module Data, Status, and Channel Configuration for the Output Modules 4-9

If this selection is enabled [the bit is set (1)] and the system enters the fault mode, it commands the module to convert the user-specified integer value from the channel’s fault value word (2 or 4) to the appropriate analog output for the range selected. If the default value, 0000, is entered, the output typically converts to the minimum value for the range selected.

EXAMPLE

• If the raw/proportional or engineering units data

format is selected and zero (0000) is entered in the ±10V dc operating range, the resulting value would be 0V dc.

• If the raw/proportional or engineering units format is

selected and zero is entered as the fault value in either a 1 to 5V dc or 4 to 20 mA range, a configuration error results.

• See Table 4.5 1769-OF2 Valid Output Data Table on

page 4-12 for more examples.

TIP

Not all controllers support this function. Refer to your controller’s user manual for details.

1769-OF2 Program/Idle Mode (PM0 and PM1)

This configuration selection provides individual program/idle mode selection for the analog channels 0 (word 0, bit 2) and 1 (word 1, bit 2). When this selection is disabled [the bit is reset (0)], the module holds the last state, meaning that the analog output remains at the last converted value prior to the condition that caused the control system to enter the program mode.

IMPORTANT

TIP

Hold last state is the default condition for the 1769-OF2 during a control system run-to-program mode change.

MicroLogix 1500™ does not support the analog output module’s default hold last state function and resets analog outputs to zero when the system enters the program mode.

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4-10 Module Data, Status, and Channel Configuration for the Output Modules

If this selection is enabled [the bit is set (1)] and the system enters the program mode, it commands the module to convert the user-specified value from the channel’s program/idle value word (3 or 5) to the appropriate analog output for the range selected.

EXAMPLE

• If the default value, 0000, is used and the range selected

is 0 to 20 mA, the module will output 0 mA for all data formats.

• If the raw/proportional or engineering units format is

selected and zero is entered as the program/idle value in either a 1 to 5V dc or 4 to 20 mA range, a configuration error results.

• See Table 4.5 1769-OF2 Valid Output Data Table on

page 4-12 for more examples.

TIP

Not all controllers support this function. Refer to your controller’s user manual for details.

1769-OF2 Program/Idle to Fault Enable (PFE0 and PFE1)

If a system currently in program/idle mode faults, this setting (word 0, bit 0; word 1, bit 0) determines whether the program/idle or fault mode value is applied to the output. If the selection is enabled [the bit is set (1)], the module applies the fault mode data value. If the selection is disabled [the bit is reset (0)], the module applies the program/idle mode data value. The default setting is disabled.

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TIP

Not all controllers support this function. Refer to your controller’s user manual for details.

Module Data, Status, and Channel Configuration for the Output Modules 4-11

1769-OF2 Fault Value (Channel 0 and 1)

Using words 2 and 4 for channels 0 and 1, you can specify the values the outputs will assume when the system enters the fault mode. The default value is 0. Valid values are dependent upon the range selected in the range selection field. If the value you entered is outside the normal operating range for the output range selected, the module generates a configuration error.

For example, if you select engineering units for the ±10V dc range and enter a fault value within the normal operating range (0 to 10000), the module will configure and operate correctly. However, if you enter a value outside the normal operating range (for example 11000), the module indicates a configuration error.

TIP

Not all controllers support this function. Refer to your controller’s user manual for details.

1769-OF2 Program/Idle Value (Channel 0 and 1)

Use words 3 and 5 to set the integer values for the outputs to assume when the system enters the program mode. The values are dependent upon the range selected in the range selection field. If the value you entered is outside the normal operating range for the output range selected, the module generates a configuration error. The default value is 0.

TIP

Not all controllers support this function. Refer to your controller’s user manual for details.

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4-12 Module Data, Status, and Channel Configuration for the Output Modules

1769-OF2 Valid Output Data Word Formats/Ranges

The following table shows the valid formats and data ranges accepted by the module.

Table 4.5 1769-OF2 Valid Output Data Table

OF2 Output Range

±10V dcOver

Input Value

10.5V dc

+10.5V dc+10.5V dc+10.5V dcOver 32767 32767 10500 10500 16793 16793 N/A N/A

-10V to +10V dc

-10.5V dc -10.5V

Under

-10.5V dc

Example Data Output

Range State

Controller

Ordered

+11.0V dc+10.5V dcOver N/A N/A 11000 10500 17202 16793 N/A N/A

+10.0V dc+10.0V dcNormal 31207 31207 10000 10000 16383 16383 N/A N/A

0.0V dc 0.0V dc Normal 0 0 0 0 8192 8192 N/A N/A

-10.0V dc

-11.0V dc

OF2 Output

-10.0V dcNormal -31207 -31207 -10000 -10000 0 0 N/A N/A

-10.5V dcUnder -32767 -32767 -10500 -10500 -410 -410 N/A N/A

-11.0V dcUnder N/A N/A -11000 -10500 -819 -410 N/A N/A

Raw/Proportio nal Data

Decimal Range Decimal Range Decimal

Controller

Ordered

OF2 Output

Engineering Unit

and Echo

Controller

Ordered

Scaled-for-PID Percent Full

Range

OF2 Output

and Echo

Controller

Ordered

Range

Decimal Range

OF2 Output

and Echo

Controller

Ordered

OF2 Output

and Echo

0V to 5V dc

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Over

5.25V dc

5.25V dc 5.25V dc +5.25V dcOver 32767 32767 5250 5250 17202 17202 10500 10500

0.0V dc to

5.0V dc

-0.5V dc -0.5V dc -0.5V dc Under -3121 -3121 -500 -500 -1638 -1638 -1000 -1000

Under

-0.5V dc

5.5V dc +5.25V dcOver N/A N/A 5500 5250 18021 17202 11000 10500

5.0V dc +5.0V dc Normal 31207 31207 5000 5000 16383 16383 10000 10000

0.0V dc 0.0V dc Normal 0 0 0 0 0 0 0 0

-1.0V dc -0.5V dc Under -6241 -3121 -500 -500 -3277 -1638 -2000 -1000

Module Data, Status, and Channel Configuration for the Output Modules 4-13

Table 4.5 1769-OF2 Valid Output Data Table

OF2 Output Range

0V to 10V dc

4 mA to 20 mA

Input Value

Over

10.5V dc

+10.5V dc +10.5V dc +10.5V dcOver 32767 32767 10500 10500 17202 17202 10500 10500

0.0V dc to

10.0V dc

-0.5V dc -0.5V dc -0.5V dc Under -1560 -1560 -500 -500 -819 -819 -500 -500

Under

-5.0V dc

Over

21.0 mA

21.0 mA +21.0 mA +21.0

4.0 mA to

20.0 mA

3.2 mA +3.2 mA +3.2 mA Under 4993 4993 3200 3200 -819 -819 -500 -500

Under 3.2 mA0.0 mA +3.2 mA Under 0 4993 0 3200 -4096 -819 -2500 -500

Example Data Output

Range State

Controller

Ordered

11.0V dc +10.5V dcOver N/A N/A 11000 10500 18021 17202 11000 10500

+10.0V dc +10.0V dcNormal 31207 31207 10000 10000 16383 16383 10000 10000

0.0V dc 0.0V dc Normal 0 0 0 0 0 0 0 0

-1.0V dc -0.5V dc Under -3121 -1560 -1000 -500 -1638 -819 -1000 -500

+22.0 mA +21.0

+20.0 mA +20.0

+4.0 mA +4.0 mA Normal 6241 6241 4000 4000 0 0 0 0

OF2 Output

Over N/A N/A 22000 21000 18431 17407 11250 10625

Over 32767 32767 21000 21000 17407 17407 10625 10625

Normal 31207 31207 20000 20000 16383 16383 10000 10000

Raw/Proportio nal Data

Engineering Unit

Scaled-for-PID Percent Full

Decimal Range Decimal Range Decimal

Range

Controller

Ordered

OF2 Output

and Echo

Controller

Ordered

OF2 Output

and Echo

Controller

Ordered

Range

Decimal Range

OF2 Output

and Echo

Controller

Ordered

OF2 Output

and Echo

1.0V to 5V dc

Over

5.25V dc

+5.25V dc +5.25V dc +5.25V dcOver 32767 32767 5250 5250 17407 17407 10625 10625

1.0V to

5.0V dc

0.5V dc +0.5V dc +0.5V dc Under 3121 3121 500 500 -2048 -2048 -1250 -1250

Under

0.5V dc

+5.5V dc +5.25V dcOver N/A N/A 5500 5250 18431 17407 11250 10625

+5.0V dc +5.0V dc Normal 31207 31207 5000 5000 16383 16383 10000 10000

+1.0V dc +1.0V dc Normal 6241 6241 1000 1000 0 0 0 0

0.0V dc 0.0V dc Under 0 3121 0 500 -4096 -2048 -2500 -1250

Publication 1769-UM002B-EN-P - July 2005

4-14 Module Data, Status, and Channel Configuration for the Output Modules

Table 4.5 1769-OF2 Valid Output Data Table

OF2 Output Range

0 mA to 20 mA

Input Value

Over

21.0 mA

21.0 mA 21.0 mA +21.0

0.0 mA to

20.0 mA

Under 0.0 mA-1.0 mA 0.0 mA Under -1560 0 0 -1000 -819 0 -500 0

Example Data Output

Range State

Controller

Ordered

+22.0 mA +21.0

20.0 mA +20.0

0.0 mA 0.0 mA Normal 0 0 0 0 0 0 0 0

OF2 Output

Over N/A N/A 22000 21000 18201 17202 11000 10500

Over 32767 32767 21000 21000 17202 17202 10500 10500

Normal 31207 31207 20000 20000 16383 16383 10000 10000

Raw/Proportio nal Data

Engineering Unit

Scaled-for-PID Percent Full

Decimal Range Decimal Range Decimal

Range

Controller

Ordered

OF2 Output

and Echo

Controller

Ordered

OF2 Output

and Echo

Controller

Ordered

Range

Decimal Range

OF2 Output

and Echo

Controller

Ordered

OF2 Output

and Echo

Publication 1769-UM002B-EN-P - July 2005

Module Data, Status, and Channel Configuration for the Output Modules 4-15

1769-OF2 Module Resolution

1769-OF 2 Output Range

-10 to +10V dc

0 to +5V dc

0 to +10V dc

+4 to +20 mA

+1 to +5V dc

0 to +20 mA

Raw/Proportional Data Over the Full Input Range

Bits and Engineering Units Resolution

Sign +14

0.64 mV/ 2 counts

Sign +13

0.64 mV/ 4 counts

Sign +14

0.64 mV/ 2 counts

Sign +14

1.28 µA/ 2 counts

Sign +13

0.64 mV/ 4 counts

Sign +14

1.28 µA/ 2 counts

Decimal Range and Count Value

±32767 Count by 2

-3121 to +32767 Count by 4

-1560 to +32767 Count by 2

+4993 to +32767 Count by 2

+3121 to +32767 Count by 4

0 to +32767 Count by 2

The resolution of an analog output channel depends on the output type/range and data format selected. Table 4.6 provides detailed resolution information for the 1769-OF2.

Table 4.6 1769-OF2 Output Resolution

Engineering Units Over the Full Input Range

Resolution Decimal

Range and Count Value

2.00 mV/ 2 counts

2.00 µA/ 2 counts

2.00 mV/ 2 counts

2.00 µA/ 2 counts

±10500 Count by 2

-500 to +5250 Count by 2

-500 to +10500 Count by 2

+3200 to +2100 Count by 2

+500 to +5250 Count by 2

0 to +21000 Count by 2

Scaled-For-PID Over the Full Input Range

Resolution Decimal

Range and Count Value

2.44 mV/ 2 counts

0.92 mV/ 3 counts

1.22 mV/ 2 counts

1.95 µA/ 2 counts

0.73 mV/ 3counts

2.44 µA/ 2 counts

-410 to +16793 Count by 2

-1638 to +17202 Count by 3

-819 to +17202 Count by 2

-819 to +17407 Count by 2

-2048 to +17407 Count by 3

0 to +17202 Count by 2

Percent Over the Full Input Range

Resolution Decimal

Range and Count Value

Not Applicable

1.00 mV/ 2 counts

2.00 mV/ 2 counts

3.20 µA/ 2 counts

0.80 mV/ 2 counts

4.00 µA/ 2 counts

Not Applicable

-1000 to +10500 Count by 2

-500 to +10500 Count by 2

-500 to +10625 Count by 2

-1250 to +10625 Count by 2

0 to +10500 Count by 2

Publication 1769-UM002B-EN-P - July 2005

4-16 Module Data, Status, and Channel Configuration for the Output Modules

1769-OF8C Output Module Memory Map

slot e

Input Image

File

slot e

Output Image

File

slot e

Configuration

File

Input Image 11 words

Output Image 9 words

The 1769-OF8C memory map shows the output, input, and configuration tables for the 1769-OF8C.

Figure 4.2 1769-OF8C Memory Map

Memory Map

General Status Bits Word 0, bits 0-8

Word 1Open-circuit, Output-held, Over-/Under-range

Open-circuit, Output-held, Over-/Under-range Word 2Open-circuit, Output-held, Over-/Under-range

Channel 0 Data Word Word 3 Channel 1 Data Word Word 4

Channel 2 Data Word Word 5 Channel 3 Data Word Word 6

Channel 4 Data Word Word 7 Channel 5 Data Word Word 8

Channel 6 Data Word Word 9 Channel 7 Data Word Word 10

Channel 0 Data Word Word 0

Channel 1 Data Word Word 1

Channel 2 Data Word Word 2

Channel 3 Data Word Word 3

Channel 4 Data Word Word 4

Channel 5 Data Word Word 5

Configuration File 64 words

Channel 6 Data Word Word 6

Channel 7 Data Word Word 7

Unlatch Over- and Under-range Bits Word 8

Channel 0 Configuration Word Words 0-7

Channel 1 Configuration Word Words 8-15

Channel 2 Configuration Word Words 16-23

Channel 3 Configuration Word Words 24-31

Channel 4 Configuration Word Words 32-39

Channel 5 Configuration Word Words 40-47

Channel 6 Configuration Word

Channel 7 Configuration Word

Bit 15 Bit 0

Words 48-55

Words 56-63

Publication 1769-UM002B-EN-P - July 2005

Module Data, Status, and Channel Configuration for the Output Modules 4-17

1769-OF8V Output Module Memory Map

slot e

Input Image

File

slot e

Output Image

File

slot e

Configuration

File

Input Image 11 words

Output Image 9 words

The 1769-OF8V memory map shows the output, input, and configuration tables for the 1769-OF8V.

Figure 4.3 1769-OF8V Memory Map

Memory Map

General Status Bits Word 0, bits 0-8

Word 1Open-circuit, Output-held, Over-/Under-range

Open-circuit, Output-held, Over-/Under-range Word 2Open-circuit, Output-held, Over-/Under-range

Channel 0 Data Word Word 3 Channel 1 Data Word Word 4

Channel 2 Data Word Word 5 Channel 3 Data Word Word 6

Channel 4 Data Word Word 7 Channel 5 Data Word Word 8

Channel 6 Data Word Word 9 Channel 7 Data Word Word 10

Channel 0 Data Word Word 0

Channel 1 Data Word Word 1

Channel 2 Data Word Word 2

Channel 3 Data Word Word 3

Channel 4 Data Word Word 4

Channel 5 Data Word Word 5

Channel 6 Data Word Word 6

Configuration File 64 words

Channel 7 Data Word Word 7

Unlatch Over- and Under-range Bits Word 8

Channel 0 Configuration Word Words 0-7

Channel 1 Configuration Word Words 8-15

Channel 2 Configuration Word Words 16-23

Channel 3 Configuration Word Words 24-31

Channel 4 Configuration Word Words 32-39

Channel 5 Configuration Word Words 40-47

Channel 6 Configuration Word

Channel 7 Configuration Word

Bit 15 Bit 0

Words 48-55

Words 56-63

Publication 1769-UM002B-EN-P - July 2005

4-18 Module Data, Status, and Channel Configuration for the Output Modules

1769-OF8C and -OF8V Output Data File

The structure of the output data file is shown in the table below. Words 0 through 7 contain the commanded analog output data for channels 0 through 7, respectively. The most significant bit is the sign bit. Word 8 contains the control bits for unlatching alarms.

Table 4.7 1769-OF8C and -OF8V Output Data Table

Bit Position

1514131211109876543210

Word

0 SGN Analog Output Data Channel 0

1 SGN Analog Output Data Channel 1

2 SGN Analog Output Data Channel 2

3 SGN Analog Output Data Channel 3

4 SGN Analog Output Data Channel 4

5 SGN Analog Output Data Channel 5

6 SGN Analog Output Data Channel 6

7 SGN Analog Output Data Channel 7

8 UU7 UO7 UU6 UO6 UU5 UO5 UU4 UO4 UU3 UO3 UU2 UO2 UU1 UO1 UU0 UO0

Channel Alarm Unlatch

These bits are written during run mode to clear any latched low- and high-clamps and under- and over-range alarms. The alarm is unlatched when the unlatch bit is set (1) and the alarm condition no longer exists. If the alarm condition persists, then the unlatch bit has no effect. You need to keep the unlatch bit set until verification from the appropriate input channel status word says that the alarm status bit has cleared (0). Then you need to reset (0) the unlatch bit. The module will not latch an alarm condition when a transition from a no alarm condition to an alarm condition occurs while a channel’s clear latch bit is set.

Table 4.8 Channel Alarm Unlatch

Bit Position

15 14131211109876543210

Word

(1)

UU7

(1)

Unlatch channel x under-range or low-clamp exceeded alarm.

(2)

Unlatch channel x over-range or high-clamp exceeded alarm.

(2)

UU6 UO6 UU5 UO5 UU4 UO4 UU3 UO3 UU2 UO2 UU1 UO1 UU0 UO0

UO7

Publication 1769-UM002B-EN-P - July 2005

Rockwell Automation 1769-IF4, 1769-IF8, 1769-OF8V, 1769-OF8C, 1769-OF2 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important User Information

Summary of Changes

Table of Contents

Preface

Who Should Use This Manual

How to Use This Manual

Conventions Used in This Manual

Rockwell Automation Support

Overview

How to Use Analog I/O

General Description

System Overview

Input Modules

Output Modules

Input Module Block Diagram

Output Module Block Diagram

Installation and Wiring

Compliance to European Union Directives

Power Requirements

General Considerations

System Assembly

Mounting

Mount the module to a panel using two screws per module. Use M4 or #8 panhead screws. Mounting screws are required on every module.

Panel Mounting Procedure Using Modules as a Template

External Power Switch

Field Wiring Connections

General

1769-IF4 and -IF8 Input Modules

1769-OF2, -OF8C, and -OF8V Output Modules

Effect of Transducer/Sensor and Cable Length Impedance on Voltage Input Accuracy

Effect of Device and Cable Output Impedance on Output Module Accuracy

Wire Size and Terminal Screw Torque

Module Data, Status, and Channel Configuration for the Input Modules

1769-IF4 Input Module Addressing

1769-IF4 Input Data File

General Status Bits (S0 through S3)

Over-Range Flag Bits (O0 through O3)

Under-Range Flag Bits (U0 through U3)

Noise Rejection

Channel Step Response

Channel Cut-Off Frequency

Module Update Time and Scanning Process

Channel Switching and Reconfiguration Times

Examples of Calculating Module Update Time

Raw/Proportional Data

Engineering Units

Scaled-for-PID

Percent Range

Valid Input Data Word Formats/Ranges

1769-IF8 Input Module Addressing

1769-IF8 Input Data File

General Status Bits (S0 through S7)

Low Alarm Flag Bits (L0 through L7)

High Alarm Flag Bits (H0 through H7)

Over-Range Flag Bits (O0 through O7)

Under-Range Flag Bits (U0 through U7)

Time Stamp Value (Word 8)

1769-IF8 Output Data File

Noise Rejection

Channel Step Response

Channel Cut-Off Frequency

Module Update Time and Scanning Process

Examples of Calculating Module Update Time

Raw/Proportional Data

Engineering Units

Scaled-for-PID

Percent Range

Valid Input Data Word Formats/Ranges

Alarm Deadband

Module Data, Status, and Channel Configuration for the Output Modules

1769-OF2 Output Module Memory Map

1769-OF2 Output Data File

1769-OF2 Input Data File

1769-OF2 Raw/Proportional Data

1769-OF2 Engineering Units

1769-OF2 Scaled-for-PID