Rockwell Automation Allen-Bradley 794-IRT8 User manual

FLEXI/OThermocouple,RTD,andMillivolt
Input Modules
Catalog Numbers 1794-IRT8, 1794-IRT8K, 1794-IRT8XT
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://literature.rockwellautomation.com) 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, when necessary, we use notes to make you aware of safety considerations.
Allen-Bradley, Rockwell Automation, FLEX I/O, RSLinx, RSLogix 5000 and TechConnect are trademarks of Rockwell Automation, Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
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.
IMPORTANT
Identifies information that is critical for successful application and understanding of the product.
ATTENTION
Identifies information about practices or circumstances that can lead to: personal injury or death, property damage, or
economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.
SHOCK HAZARD
Labels may be on or inside the equipment, such as a drive or motor, to alert people that dangerous voltage may be present.
BURN HAZARD
Labels may be on or inside the equipment, such as a drive or motor, to alert people that surfaces may reach dangerous
temperatures.

iii Publication 1794-6.5.12 - September 2011
Summary of Changes
This manual contains new and updated information. Changes throughout this
revision are marked by change bars, as shown to the right of this paragraph.
New and Updated
Information
This table contains the changes made to this revision.
Additional less significant changes (such as improvement of drawings) have
been made throughout the document.
Changes Page
Addition of two catalogs – 1794-IRT8K and 1794-IRT8XT 1, 53
The following sections have been added to Chapter 1 – Overview of FLEX I/O
and Your Thermocouple, RTD, and Millivolt Input Module:
•The FLEX System
•Types of Modules
•What the FLEX I/O Input Module Does
•The FLEX I/O Module in a Logix Control System
1
The following section has been added to Chapter 2 – Install Your FLEX I/O Input
Module:
•Series A and Series B
8
The following new topics have been added:
•Configure Your FLEX I/O Module with RSLogix 5000 Software
(Chapter 3)
•Troubleshoot the Module (Chapter 6)
21
51
•Electronic Data Sheet (EDS) Files (Appendix B) 57
The following topic, previously Chapter 3 in the last revision, has been
relegated to the Appendices section:
•Program Your Thermocouple/RTD Input Module (Appendix C) 59

Publication 1794-6.5.12 - September 2011
iv Summary of Changes
Notes:

vPublication 1794-6.5.12-EN-E - September 2011
Table of Contents
Summary of Changes
New and Updated Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Preface
Who Should Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Purpose of the Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
About the Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Related Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x
Common Techniques Used in this Manual. . . . . . . . . . . . . . . . . . . . . . xii
Chapter 1
Overview of FLEX I/O and Your
Thermocouple, RTD, and
Millivolt Input Module
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
The FLEX System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Types of Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
What the FLEX I/O Input Module Does . . . . . . . . . . . . . . . . . . . . . . . 2
The FLEX I/O Module in a Logix Control System . . . . . . . . . . . . . . . 3
Physical Features of Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Chapter 2
Install Your FLEX I/O Input
Module
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Before You Install Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Series A and Series B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Install the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Mount on a DIN Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Mount on a Panel or Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mount the FLEX I/O Module on the Terminal Base Unit . . . . . 14
Wiring Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Connect Wiring to the FLEX I/O Module . . . . . . . . . . . . . . . . . . 16
Identify RTD Wire Pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Chapter 3
Configure Your FLEX I/O
Module with RSLogix 5000
Software
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Add and Configure the FLEX I/O Module. . . . . . . . . . . . . . . . . . . . . 21
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Chapter 4
Read and Write Configuration
Maps for the FLEX I/O Module
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Configure Your Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Configurable Options and Their Effect on the Channels . . . . . . . . . . 27
Options that Affect All Channels . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Options that Affect Each Group of Four Inputs . . . . . . . . . . . . . 28
Sensor Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Read Data From the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Publication 1794-6.5.12-EN-E - September 2011
vi Table of Contents
Map Data for the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Thermocouple and RTD Input Module Image Table
Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Block Transfer Read and Write . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Bit/Word Descriptions for the Input Module Block Transfer
Read Words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Using Series A Functionality in a
Series B Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Chapter 5
Calibrate Your Module Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
When and How to Calibrate Your FLEX I/O Module. . . . . . . . . . . . 39
Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Calibrate Your Input Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Calibration Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Wiring Connections for Calibrating the Thermocouple and
RTD Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Read and Write Words for Calibration. . . . . . . . . . . . . . . . . . . . . . 42
EDT Calibration Command and Command Data Summary . . . . 44
Offset Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Gain Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Current Source Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Cold Junction Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Channel Loop Compensation Calibration . . . . . . . . . . . . . . . . . . . 49
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Chapter 6
Troubleshoot the Module Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Module Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Appendix A
Specifications Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
General Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Appendix B
Electronic Data Sheet (EDS)
Files
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Updating EDS File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
EDS Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Publication 1794-6.5.12-EN-E - September 2011
Table of Contents vii
Appendix C
Programming Your Module
with PLC Family Processors
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Enter Block Transfer Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
PLC-2 Family Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
PLC-3 Family Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
PLC-5 Family Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
PLC-5/250 Family Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Appendix D
Safety Approvals European Hazardous Location Approval. . . . . . . . . . . . . . . . . . . . . . . 65
North American Hazardous Location Approval . . . . . . . . . . . . . . . . . 66
Index

Publication 1794-6.5.12-EN-E - September 2011
viii Table of Contents
Notes:

ix Publication 1794-6.5.12 - September 2011
Preface
Read this preface to familiarize yourself with the rest of the manual. It provides
information concerning:
• who should use this manual
• the purpose of this manual
• related documentation
• conventions used in this manual
• terminology used in this manual
Who Should Use This
Manual
We assume that you have previously used an Allen-Bradley programmable
controller, that you are familiar with its features, and that you are familiar with
the terminology we use. If not, read the user manual for your processor before
reading this manual.
Purpose of the Manual
This manual is a reference guide for the FLEX I/O Thermocouple, RTD,
Millivolt Input Modules. It describes the procedures for installing, configuring
and troubleshooting your module. For more information, consult the
following chapters.
About the Vocabulary
This manual covers the 1794-IRT8, 1794-IRT8K, and 1794-IRT8XT modules,
which are identical, except that the 1794-IRT8K is conformally coated.
In this manual, we refer to:
• the individual Thermocouple, RTD, and mV module as the “module,”
or “TC, RTD, and mV module.”
• the programmable controller as the “controller” or the “processor.”
Topic See
Overview of FLEX I/O and Your Thermocouple, RTD, and Millivolt Input Module Chapter 1
Install Your FLEX I/O Input Module Chapter 2
Configure Your FLEX I/O Module with RSLogix 5000 Software Chapter 3
Read and Write Configuration Maps for the FLEX I/O Module Chapter 4
Calibrate Your Module Chapter 5
Troubleshoot the Module Chapter 6
Specifications Appendix A
Electronic Data Sheet (EDS) Files Appendix B
Programming Your Module with PLC Family Processors Appendix C
Safety Approvals Appendix D

Publication 1794-6.5.12 - September 2011
x Preface
Related Documentation
The following documents contain additional information about Rockwell
Automation products. To obtain a copy, contact your local
Rockwell Automation office or distributor.
Resource Description
FLEX I/O Product Profile, publication 1794-PP019 xxxxx Comprehensive product profile for the FLEX I/O product line.
FLEX I/O ControlNet Redundant Media Adapter,
publication 1794-5.18 x xxxx
Information on how to install the FLEX I/O ControlNet Redundant Media
Adapter (1794-ACNR).
FLEX I/O EtherNet/IP Adapter Module Installation
Instructions, publication 1794-IN082 x xxxx
Information on how to install the FLEX I/O EtherNet/IP Adapter Module
(Catalog No. 1794-AENT).
FLEX I/O ControlNet Adapter Module Installation
Instructions, publication 1794-IN128 x xxxx
Information on how to install the ControlNet Adapter Modules
(Catalog No. 1794-ACN15, 1794-ACN15K, 1794-ACNR15, 1794-ACNR15XT,
Series D).
FLEX I/O DeviceNet Adapter Module Installation
Instructions, publication 1794-IN099 x xxxxxxxxxxxxx
Information on how to install the FLEX I/O DeviceNet Adapter Modules
(Catalog No. 1794-ADN, 1794-ADNK).
Remote I/O Adapter Modules Installation Instructions,
publication 1794-IN098 x xxxxxxxxxxxxx
Information on how to install the Remote I/O Adapter Modules
(Catalog No. 1794-ASB, 1794-ASB2, 1794-ASBK, 1794-ASB2K).
Remote I/O Adapter Module User Manual, publication
1794-UM009 x xxxxxxxxxxxxx
Information on how to use the Remote I/O Adapter Module
(Catalog No. 1794-ASB).
FLEX I/O PROFIBUS Adapter Module Installation
Instructions, publication 1794-IN087 x xxxxxxxxxxxxx
Information on how to install the FLEX I/O PROFIBUS Adapter
(Catalog No. 1794-APB).
FLEX I/O PROFIBUS Adapter Module User Manual,
publication 1794-UM057 x xxxxxxxxxxxxx
Information on how to use the FLEX I/O PROFIBUS Adapter Module
(Catalog No. 1794-APB).
Flex I/O Digital Input Modules Installation Instructions,
publication 1794-IN093 x xxxxxxxxxxxxx
Information on how to install the Flex I/O Digital Input Modules
(Catalog No. 1794-IB8, 1794-IB16, 1794-IB16K, 1794-IB32).
Flex I/O Digital DC Sourcing Input and Sinking Output
Modules Installation Instructions,
publication 1794-IN095 x xxxxxxxxxxxxx
Information on how to install the Flex I/O Digital DC Sourcing Input and
Sinking Output Modules (Catalog No. 1794-IV16, 1794-OV16, 1794-OV16P).
Flex I/O Digital DC Sourcing Output Modules Installation
Instructions, publication 1794-IN094 x xxxxxxxxxxxxx
Information on how to install the Flex I/O Digital DC Sourcing Output Modules
(Catalog No. 1794-OB8, 1794-OB8EP, 1794-OB16, 1794-OB16P, 1794-OB32P).
Flex I/O Input/ Output Module Installation Instructions,
publication 1794-IN083 x xxxxxxxxxxxxx
Information on how to install the Flex I/O Input/ Output Modules
(Catalog No. 1794-IB16XOB16P, 1794-IB10XOB6).
Flex I/O 8 Output Relay Module Installation Instructions,
publication 1794-IN019 x xxxxxxxxxxxxx
Information on how to install the Flex I/O 8 Output Relay Modules
(Catalog No. 1794-OW8, 1794-OW8K, 1794-OW8XT).
FLEX I/O Input, Output and Input/Output Analog Modules
Installation Instructions, publication 1794-IN100 xxxxxxx
Information on how to install the FLEX I/O Input, Output and Input/Output
Analog Modules (Catalog No. 1794-IE8, 1794-IE4XOE2, 1794-OE4, 1794-IE8K,
1794-OE4K).
FLEX I/O Analog Module User Manual,
publication 1794-6.5.2 x xxxxxxxxxxxxx
Information on how to install the FLEX I/O Analog Modules
(Catalog No. 794-OE4, 1794-IE8, 1794-IE12, 1794-OE12, 1794-IE4XOE2,
1794-IE8XOE4, 1794-IE4XOE2XT, 1794-IE8XT, 1794-OE4XT).
FLEX I/O Isolated Analog Output Module Installation
Instructions, publication 1794-IN037 x xxxxxxxxxxxxx
Information on how to install the FLEX I/O Isolated Analog Output Module
(Catalog No. 1794-OF4I).