Allen-Bradley MicroLogix 1200 User manual

MicroLogix™ 1200

Thermocouple/mV

Input Module

(Catalog Number 1762-IT4)

User Manual

AB Parts

Important User Information

Because of the variety of uses for the products described in this

publication, those responsible for the application and use of these

products must satisfy themselves that all necessary steps have been

taken to assure that each application and use meets all performance

and safety requirements, including any applicable laws, regulations,

codes and standards. In no event will Allen-Bradley be responsible or

liable for indirect or consequential damage resulting from the use or

application of these products.

Any illustrations, charts, sample programs, and layout examples

shown in this publication are intended solely for purposes of

example. Since there are many variables and requirements associated

with any particular installation, Allen-Bradley does not assume

responsibility or liability (to include intellectual property liability) for

actual use based upon the examples shown in this publication.

Allen-Bradley publication SGI-1.1, Safety Guidelines for the

Application, Installation and Maintenance of Solid-State Control

(available from your local Allen-Bradley office), describes some

important differences between solid-state equipment and

electromechanical devices that should be taken into consideration

when applying products such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in whole

or part, without written permission of Rockwell Automation, is

prohibited.

Throughout this publication, notes may be used to make you aware of

safety considerations. The following annotations and their

accompanying statements help you to identify a potential hazard,

avoid a potential hazard, and recognize the consequences of a

potential hazard:

WARNING

Identifies information about practices or

circumstances that can cause an explosion in a

hazardous environment, which may lead to personal

injury or death, property damage, or economic loss.

ATTENTION

Identifies information about practices or

circumstances that can lead to personal injury or

death, property damage, or economic loss.

IMPORTANT Identifies information that is critical for successful

application and understanding of the product.

iPublication 1762-UM002A-EN-P - July 2002

Table of Contents

Preface

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

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

Manual Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . P-2

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

Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . P-3

Local Product Support . . . . . . . . . . . . . . . . . . . . . . . . . P-3

Technical Product Assistance . . . . . . . . . . . . . . . . . . . . P-3

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

Chapter 1

Overview

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

Thermocouple/mV Inputs and Ranges . . . . . . . . . . . . . 1-1

Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Filter Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

General Diagnostic Features. . . . . . . . . . . . . . . . . . . . . 1-4

System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Module Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Module Field Calibration . . . . . . . . . . . . . . . . . . . . . . . 1-6

Chapter 2

Installation and Wiring

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

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

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

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

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

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

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

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

Selecting a Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Minimum Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

DIN Rail Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

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

System Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Field Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

AB Parts

Publication 1762-UM002A-EN-P - July 2002

Table of Contents ii

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Terminal Block Layout . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Labeling the Terminals. . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Wiring the Finger-Safe Terminal Block . . . . . . . . . . . . . 2-10

Wire Size and Terminal Screw Torque . . . . . . . . . . . . . 2-11

Terminal Door Label . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Wiring the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . 2-13

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Chapter 3

Module Data, Status, and Channel

Configuration

Module Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Accessing Input Image File Data . . . . . . . . . . . . . . . . . . . . 3-1

Input Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Input Data Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

General Status Bits (S0 to S4) . . . . . . . . . . . . . . . . . . . . 3-2

Open-Circuit Flag Bits (OC0 to OC4) . . . . . . . . . . . . . . 3-3

Over-Range Flag Bits (O0 to O4) . . . . . . . . . . . . . . . . . 3-3

Under-Range Flag Bits (U0 to U4). . . . . . . . . . . . . . . . . 3-3

Configuring Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Configuration Data File . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Enabling or Disabling a Channel (Bit 15) . . . . . . . . . . . 3-6

Selecting Data Formats (Bits 14 through 12) . . . . . . . . . 3-6

Selecting Input Type (Bits 11 through 8). . . . . . . . . . . . 3-8

Selecting Temperature Units (Bit 7) . . . . . . . . . . . . . . . 3-9

Determining Open-Circuit Response (Bits 6 and 5) . . . . 3-9

Selecting Input Filter Frequency (Bits 2 through 0) . . . . 3-10

Selecting Enable/Disable Cyclic Calibration

(Word 4, Bit 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Determining Effective Resolution and Range . . . . . . . . . . . 3-14

Determining Module Update Time. . . . . . . . . . . . . . . . . . . 3-33

Effects of Autocalibration on Module Update Time . . . . 3-34

Calculating Module Update Time . . . . . . . . . . . . . . . . . 3-35

Impact of Autocalibration on Module Startup

During Mode Change. . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

Chapter 4

Diagnostics and Troubleshooting

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Stand Clear of Equipment. . . . . . . . . . . . . . . . . . . . . . . 4-2

Program Alteration. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Safety Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

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Table of Contents iii

Module Operation vs. Channel Operation . . . . . . . . . . . . . 4-2

Power-up Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Channel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Invalid Channel Configuration Detection. . . . . . . . . . . . 4-3

Over- or Under-Range Detection . . . . . . . . . . . . . . . . . 4-3

Open-Circuit Detection . . . . . . . . . . . . . . . . . . . . . . . . 4-4

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

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

Module Error Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Extended Error Information Field . . . . . . . . . . . . . . . . . 4-5

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Contacting Rockwell Automation . . . . . . . . . . . . . . . . . . . . 4-7

Appendix A

Specifications

General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Input Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Repeatability at 25°C (77°F) . . . . . . . . . . . . . . . . . . . . . . . A-3

Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Accuracy Versus Thermocouple Temperature and Filter

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Appendix B

Two’s Complement Binary

Numbers

Positive Decimal Values . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Negative Decimal Values. . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Appendix C

Thermocouple Descriptions

International Temperature Scale of 1990. . . . . . . . . . . . . . . C-1

Type B Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Type E Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

Type J Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5

Type K Thermocouples. . . . . . . . . . . . . . . . . . . . . . . . . . . C-7

Type N Thermocouples. . . . . . . . . . . . . . . . . . . . . . . . . . . C-9

Type R Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-11

Type S Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-12

Type T Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-14

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-17

Appendix D

Using Thermocouple Junctions

Using a Grounded Junction Thermocouple . . . . . . . . . . . . D-1

Using an Ungrounded (Isolated) Junction Thermocouple . . D-2

Using an Exposed Junction Thermocouple. . . . . . . . . . . . . D-3

AB Parts

Publication 1762-UM002A-EN-P - July 2002

Table of Contents iv

Appendix E

Module Configuration Using

MicroLogix 1200 and RSLogix 500

Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

1762-IT4 Configuration File . . . . . . . . . . . . . . . . . . . . . E-2

Configuration Using RSLogix 500 Version 5.50 or Higher . . E-2

Generic Extra Data Configuration . . . . . . . . . . . . . . . . . E-6

Configuration Using RSLogix 500 Version 5.2 or Lower. . . . E-7

Glossary

Index

1Publication 1762-UM002A-EN-P - July 2002

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

Use this manual if you are responsible for designing, installing,

programming, or troubleshooting control systems that use

Allen-Bradley MicroLogix™ 1200.

How to Use This Manual

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 1762-IT4.

Manual Contents

If you want... See

An overview of the thermocouple/mV input module Chapter 1

Installation and wiring guidelines Chapter 2

Module addressing, configuration and status information Chapter 3

Information on module diagnostics and troubleshooting Chapter 4

Specifications for the input module Appendix A

Information on understanding two’s complement binary numbers Appendix B

Thermocouple descriptions Appendix C

Information on using the different types of thermocouple junctions Appendix D

An example of configuration using RSLogix 500 Appendix E

AB Parts

Publication 1762-UM002A-EN-P - July 2002

Preface 2

Related Documentation

The table below provides a listing of publications that contain

important information about MicroLogix 1200 systems.

If you would like a manual, you can:

•download a free electronic version from the internet at

www.theautomationbookstore.com

•purchase a printed manual by:

–contacting your local distributor or Rockwell Automation

representative

–visiting www.theautomationbookstore.com and placing

your order

–calling 1.800.963.9548 (USA/Canada) or 001.330.725.1574

(Outside USA/Canada)

Conventions Used in This

Manual

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.

For Read this document Document number

A user manual containing information on how to install,

use and program your MicroLogix 1200 controller MicroLogix™ 1200 User Manual 1762-UM001

An overview of the MicroLogix 1200 System, including

1762 Expansion I/O. MicroLogix™ 1200 Technical Data 1762-TD001

Information on the MicroLogix 1200 instruction set. MicroLogix 1200 and MicroLogix 1500 Programmable

Controllers Instruction Set Reference Manual 1762-RM001

In-depth information on grounding and wiring

Allen-Bradley programmable controllers. Allen-Bradley Programmable Controller Grounding and

Wiring Guidelines 1770-4.1

Publication 1762-UM002A-EN-P - July 2002

Preface 3

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 4, 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

AB Parts

Publication 1762-UM002A-EN-P - July 2002

Preface 4

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