Rockwell Automation 1794-IRT8XT User Manual

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FLEX I/O Thermocouple, RTD, and Millivolt Input Modules

Catalog Numbers 1794-IRT8, 1794-IRT8K, 1794-IRT8XT User Manual

Important User Information

WARNING

IMPORTANT

ATTENTION

SHOCK HAZARD

BURN HAZARD

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

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.

available from your local Rockwell Automation sales office or online at

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, and recognize the consequence.

Labels may be on or inside the equipment, such as a drive or motor, to alert people that dangerous voltage may be present.

Labels may be on or inside the equipment, such as a drive or motor, to alert people that surfaces may reach dangerous temperatures.

Allen-Bradley, Rockwell Automation, FLEX I/O, RSLinx, RSLogix 5000 and TechConnec t are trademarks of Rockwell Automation, Inc.

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

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.

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

The following section has been added to Chapter 2 – Install Your FLEX I/O Input Module:

•Series A and Series B

The following new topics have been added:

•Configure Your FLEX I/O Module with RSLogix 5000 Software

(Chapter 3)

•Troubleshoot the Module (Chapter 6)

•Electronic Data Sheet (EDS) Files (Appendix B)

51 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)

Additional less significant changes (such as improvement of drawings) have been made throughout the document.

iii Publication 1794-6.5.12 - September 2011

iv Summary of Changes

Notes:

Publication 1794-6.5.12 - September 2011

Overview of FLEX I/O and Your Thermocouple, RTD, and Millivolt Input Module

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

Install Your FLEX I/O Input Module

Configure Your FLEX I/O Module with RSLogix 5000 Software

Read and Write Configuration Maps for the FLEX I/O Module

Chapter 2

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

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Add and Configure the FLEX I/O Module. . . . . . . . . . . . . . . . . . . . . 21

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Chapter 4

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

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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

Publication 1794-6.5.12-EN-E - September 2011

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Updating EDS File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

EDS Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

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

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viii Table of Contents

Notes:

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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

Purpose of the 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.

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.

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 A

ppendix D

About the Vocabulary

ix Publication 1794-6.5.12 - September 2011

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.”

x Preface

Common Techniques Used in this Manual

x xxxxxxxxxxxxx

The following conventions are used throughout this manual:

• Bulleted lists such as this one provide information, not procedural steps.

• Numbered lists provide sequential steps or hierarchical information.

• Italic type is used for emphasis.

Information on how to install the FLEX I/O DC Power Supply (Catalog No. 1794-PS13, 1794-PS3).

In-depth information on grounding and wiring Allen-Bradley programmable controllers.

A glossary of industrial automation terms and abbreviations.

Publication 1794-6.5.12 - September 2011

Chapter

I/O moduleTerminal baseAdapter

1794-IRT8

45374

Overview of FLEX I/O and Your Thermocouple, RTD, and Millivolt Input Module

Overview

The FLEX System

This chapter provides a description of the FLEX I/O Thermocouple, RTD, and Millivolt Input module and an overview of how it communicates with programmable controllers.

Topic Page

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

FLEX I/O is a small, modular I/O system for distributed applications that performs all of the functions of rack-based I/O. The FLEX system contains the following components shown below:

• Adapter – transfers read and write configuration data to and from the I/O module

• Terminal base – contains a terminal strip to terminate wiring for two- or three-wire devices

• I/O module – contains the bus interface and circuitry needed to perform specific functions related to your application

1 Publication 1794-6.5.12 - September 2011

2 Overview of FLEX I/O and Your Thermocouple, RTD, and Millivolt Input Module

The FLEX system consists of an adapter module, terminal base unit, DIN rail, power supply, and adapter cabling components. You can use up to 8 terminal bases per adapter module.

For detailed instructions on how to set up and install your module, refer to the topic, Install Your FLEX I/O Input Module, on page 7.

Types of Modules

What the FLEX I/O Input Module Does

The module refer to the following catalogs.

Catalog No. Voltage Inputs Description

1794-IRT8 24V DC 8 Analog – 8-pt, 16 bit non-isolated RTD,

thermocouple and mV Input module

1794-IRT8K 24V DC 8 Analog – 8-pt, 16 bit non-isolated RTD,

thermocouple and mV Input module. Conformally coated module.

1794-IRT8XT 24V DC 8 Analog – 8-pt, 16 bit non-isolated RTD,

thermocouple and mV Input module designed for extended temperature.

The module accepts up to 8 thermocouple or RTD inputs. The inputs are nonisolated and are selected with analog multiplexers. The inputs accept millivolt or resistive inputs. Default input spans are -40.00 mV… +100.00 mV or 0.0…500.0 Ω. Fault indicators are located on the field side.

No switches or jumpers are used on the TC and RTD Input module. The inputs have both fixed hardware filters and selectable firmware digital filters.

The module is a high-speed, high-accuracy temperature and millivolt measuring module that accepts thermocouple inputs, 2-, 3-, and 4-wire RTD inputs, and mV source inputs.

Publication 1794-6.5.12 - September 2011

It offers the following:

• wire-off, over-range, and under-range detection

• good common mode rejection

• usage with long thermocouple wiring

• usage with grounded or ungrounded thermocouples

The Series B version of 1794-IRT8 provides capability to work with grounded thermocouples.

Use cold junction compensators (cat. no. 1794-CJC2) in thermocouple mode. Two cold junction compensators are shipped with the 1794-IRT8.

Overview of FLEX I/O and Your Thermocouple, RTD, and Millivolt Input Module 3

IN 0 IN 2 IN 4 IN 6IN 1 IN 3 IN 5 IN 7

TC RTD INPUT 8 CHANNEL

1794-IRT8

PWR

FF F FF F F F

45316

The adapter transfers your configuration data.

FlexBus

External devices transmit analog signals to the module.

The module converts analog signals into binary format and stores these values until the adapter requests their transfer.

The adapter receives data from the modules and stores it in the data table.

The adapter module determines that the transfer was made without error and input values are within specified range.

Your ladder program can use and/or move the data (if valid) before it is overwritten by the transfer of new data in a subsequent transfer.

New configuration data can be sent to the module any time during operation.

1794-ACN15 1794-ACNR15 1794-ACNR15K 1794-ADN 1794-AENT 1794-APBDPV1 1794-ASB 1794-APB

Adapter

1794-AENT shown

The FLEX I/O Module in a Logix Control System

The FLEX I/O Thermocouple, RTD, and Millivolt modules are intelligent modules that interface analog signals with Rockwell Automation programmable controllers through a FLEX I/O adapter module.

The adapter transfers data to and from the module. These transfers allow:

• the adapter to obtain input or output values and status from the module

• the user to establish the mode of operation through a process called configuration

The following illustration shows the flow of communication between the adapter and the I/O module.

Typical Communication Between the Adapter and a Module

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4 Overview of FLEX I/O and Your Thermocouple, RTD, and Millivolt Input Module

45567

ATTENTION

A broader view of how the FLEX I/O module interfaces with the different elements in a Logix system is shown in the sample illustration below.

PC running controller and Rockwell Automation configuration software

Bridge

Ethernet

In this example, the FLEX I/O module communicates with the controller through the adapter. The controller can produce and consume tags. It can initiate MSG instructions that send and receive data or configure devices. Configuration of devices and the network is done through the personal computer running the controller and configuration software.

PanelView Station

FLEX System

1794 adapter 1794 FLEX I/O module

Physical Features of Your Module

To learn the prerequisites and steps to configure your FLEX I/O module using RSLogix 5000 software, see Configure Your FLEX I/O Module with RSLogix 5000 Software on page 21.

The following publications provide more information about EtherNet/IP, and ControlNet modules in a Logix5000 system:

•EtherNet/IP Modules in Logix5000 Control Systems, publication ENET-UM001

•ControlNet Modules in Logix5000 Control Systems, publication CNET-UM001

The module label identifies the keyswitch position, wiring and module type. A removable label provides space for writing individual designations per your application. Indicators are provided to identify input fault conditions, and to show when power is applied to the module.

Publication 1794-6.5.12 - September 2011

Overview of FLEX I/O and Your Thermocouple, RTD, and Millivolt Input Module 5

IN 0 IN 2 IN 4 IN 6IN 1 IN 3 IN 5 IN 7

TC RTD INPUT 8 CHANNEL

1794-IRT8

PWR

FF F FF F F F

1794-IRT8

Input designators

Module type Removable label

Keyswitch position indicator (#3)

Power on indicator

45317

Module Label and Indicators

Chapter Summary

In this chapter, you were introduced to the FLEX I/O system and the Thermocouple, RTD, and mV input module, and how it communicates with programmable controllers.

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6 Overview of FLEX I/O and Your Thermocouple, RTD, and Millivolt Input Module

Notes:

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Install Your FLEX I/O Input Module

ATTENTION

Chapter

Overview

Before You Install Your Module

This chapter provides you with pre-installation requirements and instructions on how to install your FLEX I/O Thermocouple, RTD, and Millivolt Input module.

Topic Page

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 Chapter Summary 20

Before installing your FLEX I/O Thermocouple, RTD, and mV module, you need to:

• verify that a suitable enclosure is available for installation of the module, and

• position the keyswitch on the terminal base.

These modules do not receive primary operational power from the backplane. 24V DC power must be applied to your module before installation. If power is not applied, the module position may appear to the adapter as an empty slot in your chassis.

If using a Series B product to replace a Series A product, connect a wire between terminals 39 and 48 on the 1794-TB3G or 1794-TB3GS terminal base unit. If not connected, the Series B product defaults to Series B functionality.

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8 Install Your FLEX I/O Input Module

ATTENTION

Series A and Series B

The table, Series A and Series B Differences, describes the differences between Series A and Series B of the FLEX I/O Thermocouple, RTD, and mV Input modules.

Series A and Series B Differences

Mode 1794-IRT8 Series A 1794-IRT8, 1794-IRT8XT

Series B

Isolation Between user side and

system side

Common Mode Range + Thermocouple Mode

Wire-off Detection

In the RSLogix 5000 software, if using a series B product to replace a series A product, the module will be accepted without an electronic key mismatch warning.

This is true for 1794-IRT8 and 1794-IRT8XT modules installed on Ethernet/IP, ControlNet, or Remote I/O networks.

The CJC Status bit, Read Word 9, Bit 3 is added with the Firmware C release of the 1794-IRT8 Series B module.

The CJC Status bit is turned On when the temperature between the CJCs is greater than 6 °C but less than 12 °C.

When this temperature difference is above 12 °C, then the CJC Alarm bits are set.

Also, if a CJC temperrature is over-range or under-range, then the associated CJC Alarm bit is set. In this condition, the CJC Status bit is not set.

The CJC Status bit did not exist in Series A.

4V DC +15V DC

When an open sensor is detected, data defaults to maximum value

Between user 24V DC and user I/O; between user side and system side

When open sensor is detected, data defaults to

minimum value

Power Requirements

Publication 1794-6.5.12 - September 2011

The wiring of the terminal base unit is determined by the current draw through the terminal base. Make certain that the current draw does not exceed 10 A.

Total current draw through the terminal base unit is limited to 10 A. Separate power connections may be necessary.

Install Your FLEX I/O Input Module 9

ATTENTION

Digital Input

Module

Analog

Module

Analog

Module

Analog

Module

Digital Output

Module

Digital Input

Module

TC/RTD/mV

Module

Analog

Module

TC/RTD/mV

Module

TC/RTD/mV

Module

TC/RTD/mV

Module

TC/RTD/mV

Module

Daisychain

Individual

Combination

24V DC

24V DC 24V DC

24V DC

24V DC 24V DC

45318

Wiring when total current draw is less than 10 A

Wiring when total current draw is less than 10 A Thermocouple, RTD, Millivolt wiring separate from digital wiring.

Total current draw through any base unit must not be greater than 10 A

Do not daisychain power or ground from the terminal base unit to any AC or DC digital module terminal base unit.

Methods of wiring the terminal base units are shown in the illustration below.

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10 Install Your FLEX I/O Input Module

ATTENTION

Note the following considerations for each type of wiring configuration:

• Daisychain – AIl modules must be analog or TC, RTD, and mV modules for this configuration.

• Individual – Use this type of of configuration for any "noisy" DC digital I/O modules in your system.

• Combination – All modules powered by the same power supply must be analog or TC, RTD, and mV modules for the combination type of configuration.

Install the Module

Installation of the FLEX I/O module consists of:

• mounting the terminal base unit

• installing the TC, RTD, and mV module into the terminal base unit

• installing the connecting wiring to the terminal base unit

If you are installing your module into a terminal base unit that is already installed, proceed to the section, Mount the FLEX I/O Module on the Terminal Base Unit, on page 14.

Mount on a DIN Rail

Do not remove or replace a terminal base unit when power is applied. Interruption of the FlexBus can result in unintended operation or machine motion.

Install the Terminal Base Unit

1. Remove the cover plug in the male connector of the unit to which you are connecting this terminal base unit.

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Install Your FLEX I/O Input Module 11

45319

45320

2. Check to make sure that the 16 pins in the male connector on the adjacent device are straight and in line so that the mating female connector on this terminal base unit will mate correctly.

Make certain that the female FlexBus connector is fully retracted into the base unit.

3. Position the terminal base at a slight angle and hooked over the top of the 35 x 7.5 mm DIN rail A (Allen-Bradley part number 199-DR1; 46277-3).

4. Slide the terminal base over tight against the adapter, or proceeding terminal base. Make sure the hook on the terminal base slides under the edge of the adapter, or proceeding terminal base, and the FlexBus connector is fully retracted.

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12 Install Your FLEX I/O Input Module

45321

45322

5. Rotate the terminal base onto the DIN rail with the top of the rail hooked under the lip on the rear of the terminal base. Use caution to make sure that the female FlexBus connector does not strike any of the pins in the mating male connector.

6. Press down on the terminal base unit to lock the terminal base on the DIN rail. If the terminal base does not lock into place, use a screwdriver or similar device to open the locking tab, press down on the terminal base until flush with the DIN rail and release the locking tab to lock the base in place.

Gently push the FlexBus connector into the side of the adapter, or proceeding terminal base, to complete the backplane connection.

For specific wiring information, refer to the installation instructions for the module you are installing in this terminal base unit.

7. Repeat the above steps to install the next terminal base unit. Ensure that the cover of the FlexBus connector on the last terminal base unit is in place.

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Install Your FLEX I/O Input Module 13

45323

Millimeters (Inches)

Mount on a Panel or Wall

Installation of a FLEX system on a wall or panel consists of:

• laying out the drilling points on the wall or panel.

• drilling the pilot holes for the mounting screws.

• mounting the adapter mounting plate.

• installing the terminal base units and securing them to the wall or panel.

If you are installing your module into a terminal base unit that is already installed, proceed to the section, Mount the FLEX I/O Module on the Terminal Base Unit, on page 14.

Use the mounting kit Cat. No. 1794-NM1 for panel or wall mounting.

35.5

(1.4)

2 3

Description Description

1 Mounting plate for adapter 3 Terminal base unit (not included) 2 #6 Self-tapping screws 4 Adapter module (not included)

To install the mounting plate on a wall or panel:

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14 Install Your FLEX I/O Input Module

Drilling Dimensions for Panel or Wall Mounting

45327

IMPORTANT

1. Lay out the required points on the wall or panel as shown in the drilling dimension drawing.

Millimeters (Inches)

21 (0.83)

35.5 (1.4)

58.5 (2.3)

35.5 (1.4)

58.5 (2.3)

35.5 (1.4)

2. Drill the necessary holes for the #6 self-tapping mounting screws.

3. Mount the mounting plate for the adapter module using two #6

self-tapping screws – 18 screws included for mounting up to 8 modules and the adapter.

Make certain that the mounting plate is properly grounded to the panel. Refer to Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1

Publication 1794-6.5.12 - September 2011

4. Hold the adapter at a slight angle and engage the top of the mounting plate in the indention on the rear of the adapter module.

5. Press the adapter down flush with the panel until the locking lever locks.

6. Position the terminal base unit up against the adapter and push the

female bus connector into the adapter.

7. Secure to the wall with two #6 self-tapping screws.

8. Repeat for each remaining terminal base unit.

Mount the FLEX I/O Module on the Terminal Base Unit

The Thermocouple, RTD, and mV input module mounts on a 1794-TB3G or 1794-TB3GS terminal base unit.

Install Your FLEX I/O Input Module 15

2 3 4

Label here or under here

40231

ATTENTION

1. Rotate keyswitch (3) on terminal base unit (4) clockwise to position 3 as

required for the module. Do not change the position of the keyswitch after wiring the terminal base unit.

Description Description

1 FlexBus connector 5 Base unit 2 Latching mechanism 6 Alignment groove 3 Keyswitch 7 Alignment bar 4 Cap plug 8 Module

2. Make certain the FlexBus connector (1) is pushed all the way to the left to connect with the neighboring terminal base or adapter. You cannot install the module unless the connector is fully extended.

3. Make sure the pins on the bottom of the module are straight so they will align properly with the connector in the terminal base unit.

If you remove or insert the module while the backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.

4. Position the module (8) with its alignment bar (7) aligned with the groove (6) on the terminal base.

5. Press firmly and evenly to seat the module in the terminal base unit. The module is seated when the latching mechanism is locked into the module.

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16 Install Your FLEX I/O Input Module

IMPORTANT

0123456789101112131415

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

1794-TB3G or 1794-TB3GK

1794-TB3GS

0...15

34...51

16...33

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

18 19 20 21 22 23 3324 25 26 27 28 29 30 31 3217

35 36 37 38 47 48 49 5034 51

39 40 41 42 43 44 45 46

Label placed at top of wiring area

34 and 50 = 24V DC 35 and 51 = common 16 and 33 = chassis 40…45 = chassis ground

35 and 51 = common 34 and 50 = 24V DC 16 and 33 = chassis ground 40…45 = chassis ground

45328

6. Remove cap plug and attach another terminal base unit to the right of this terminal base unit if required. Make sure the last terminal base has the cap plug in place.

The adapter is capable of addressing eight modules. Do not exceed a maximum of eight terminal base units in your system.

Wiring Information

Wiring the module is done using the 1794-TB3G, 1794-TB3GK or the 1794-TB3GS terminal base units.

1794-TB3G, 1794-TB3GK and 1794-TB3GS Wiring

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Connect Wiring to the FLEX I/O Module

Wiring to the TC, RTD, and mV module is made through the terminal base unit on which the module mounts.

The module is compatible with the 1794-TB3G, 1794-TB3GK and 1794-TB3GS terminal base units.

Connecting Wiring Using a 1794-TB3G, 1794-TB3GK or 1794-TB3GS Terminal Base Unit

1. Connect individual signal wiring to numbered terminals on 0…15 row (A), and 17…32 row (B), on the terminal base unit as indicated in the table below. Use Belden 8761 cable for mV signal wiring, or the appropriate thermocouple wire for your thermocouples.

Install Your FLEX I/O Input Module 17

ATTENTION

Signal wiring shields can be connected to terminals 16 or 33 on row B or terminals 40…45 on row C.

2. Connect the +V DC power lead to terminal 34 on row C, terminals 34…51.

3. Connect the -V DC common (return-) to terminal 35 on row C, terminals 34…51.

Do not daisychain power or ground from this terminal base unit to any AC or DC digital module terminal base units.

4. If daisychaining power to the next terminal base unit, connect a jumper from terminal 50 (+V DC) on this base unit to +V terminal on the next terminal base unit.

5. Connect a jumper from terminal 51 (-V DC common) to the -V DC common terminal on the next terminal base unit.

6. If using cold junction compensators, make these connections as shown in the CJC Sensor chart below.

Identify RTD Wire Pairs

If the RTD wires are color-coded, the wires that are the same color are connected together. If the wires are not color-coded, use an ohmmeter to determine the pairs as explained below.

How to Connect a 4-wire RTD

If the 4-wire RTD wires are all different colors, use an ohmmeter to determine which leads are connected together. One of the leads in each pair is the compensation lead. Either lead of the pair can be the compensation lead. Attach one pair to terminals L and - and the other pair to + and H.

How to Connect a 3-wire RTD

If the 3-wire RTD wires are all different colors, use an ohmmeter to determine which leads are connected together. Either lead of the pair can be the compensation lead. Attach one lead of the pair to terminal L and the other to +. Attach the single lead to -.

Refer to the table, Wiring Connections for the FLEX I/O Input Module, on page 18.

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18 Install Your FLEX I/O Input Module

1 1a

2 1

2-wire

3-wire

4-wire

Thermocouple

RTD

Millivolt

45332

45359

Wiring Connections for the FLEX I/O Input Module

Connect the following:

Input types H L + -

Shield

RTD – 2-wire 1 2 RTD – 3-wire 3 1 2 RTD – 4-wire 1a 2a 1 2 Thermocouple 1 2 Millivolt 1 2

(1)

Terminals 37, 38 and 39 and 46, 47 and 48 are for cold junction compensation, with 38 and 47 as chassis GND.

CJC Sensor

Input + Chassis

CJC Tail

(1)

Ground

CJC1 C-37 C-38 C-39 A-5 (B-22) CJC2

(1)

Terminals 37, 38, and 39, and 46, 47, and 48 are for cold junction compensation, with 38 and 47 as chassis GND. Connect the tail of CJC1 to terminal 5 and CJC2 to terminal 12 if channels 0…3 or 0…7 are configured for thermocouples. Connect the tail of CJC1 to terminal 22 and CJC2 to 29 if channels 4…7 are configured for thermocouples.

C-46

C-

47 C-48 A-12 (B-29)

(1)

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Terminal Base Unit Wiring Connections

1794-TB3G, 1794-TB3GK, and 1794-TB3GS Terminal

(1)

Low Signal

RTD Source Current (+)

Signal Return (-)

RTD or TC Channel

Base Units High Signal

Terminal (H)

Terminal (L)

0 A-1 A-2 A-0 A-3 1 A-5 A-6 A-4 A-7 2A-9A-10A-8A-11 3 A-13 A-14 A-12 A-15 4 B-18 B-19 B-17 B-20 5 B-22 B-23 B-21 B-24 6 B-26 B-27 B-25 B-28 7 B-30 B-31 B-29 B-32 +24V DC Power 34 and 50 24V DC Common 35 and 51

(1)

Terminals 37, 38, and 39, and 46, 47 and 48 are for cold junction compensation. Terminals 16, 33 and 40…45 are chassis ground. Connect tail of CJC1 to terminal 5 and CJC2 to 12 if channels 0…3 or 0…7 are thermocouples. Connect tail of CJC1 to terminal 22 and CJC2 to 29 only if channels 4…7 are used.

Install Your FLEX I/O Input Module 19

IMPORTANT

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

012 34567 891011 12 13 14 15

1234567891011121314150

35 36 37 38 39 40 41 42 43 44 45 46

49 50 5134

1794-TB3G

0...15

34...51

16...33

4-Wire RTD Channel 3

2-Wire RTD Channel 1

3-Wire RTD Channel 2

CJC

Thermocouple Channel 4

1 3 2

1 1a 2a

45329

ATTENTION

Disconnecting and reconnecting RTDs or CJCs with power applied temporarily disturbs the channel steady state data. Allow 2 minutes for settling time after finishing connections.

If using RTD isolators, use 2- or 4-wire configurations only, and add digital filtering to the inputs.

Example of 2-, 3- and 4-wire RTD and Thermocouple Wiring to a 1794-TB3G Terminal Base Unit

Keep exposed area of inner conductor as short as possible.

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20 Install Your FLEX I/O Input Module

45330

Example of Millivolt Wiring to a 1794-TB3G Terminal Base Unit

Millivolt

Source

Millivolt

Source

Millivolt

Source

Millivolt Source

Chapter Summary

1234 567891011121314150

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 5134

910

13 14

0...15

16...33

34...51

This chapter provided the user with installation prerequisites and instructions for the FLEX I/O Input module in an existing programmable controller system. It also provided the user with instructions on how to wire to a terminal base unit.

A B

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Chapter

ATTENTION

Configure Your FLEX I/O Module with RSLogix 5000 Software

Overview

This chapter describes how to configure the FLEX I/O Thermocouple, RTD, and mV module for the ControlLogix and CompactLogix system using the RSLogix 5000 software. The 1794-IRT8 module can communicate through different networks such as ControlNet, Ethernet, Profibus, among others. In the examples below, the Ethernet adapter is used for communication between the Logix processor and the FLEX I/O bus.

If using an SLC controller with ControlNet, refer to the associated I/O scanner documentation.

If using a PLC 5 controller, refer to the PLC 5 controller documentation for ControlNet configuration information.

You need to follow these series of steps to fully configure your FLEX I/O module in the RSLogix 5000 software.

1. Add and configure the new local bridge module, such as 1756-ENBT, to your project. This user manual assumes you have already properly configured this module. Refer to the associated documentation.

2. Add and configure the new adapter module, such as a FLEX I/O EtherNet Adapter (1794-AENT). This user manual assumes you have already properly configured this module. Refer to the associated documentation.

3. Add and configure your FLEX I/O module. See the steps provided below.

4. Download the configuration to the controller.

Add and Configure the FLEX I/O Module

21 Publication 1794-6.5.12 - September 2011

To be able to add your FLEX I/O Thermocouple, RTD, mV module, you should have already added and configured your Ethernet bridge and/or adapter.

22 Configure Your FLEX I/O Module with RSLogix 5000 Software

Right-click the local adapter module.

Select New Module.

1. In the I/O Configuration tree, right-click the 1794-AENT adapter, and select New Module.

2. The Select Module dialog appears. Select the FLEX I/O module and click OK.

Publication 1794-6.5.12 - September 2011

3. Complete the following fields in the New Module dialog that appears. Click OK.

•Name

• Description

•Comm Format

• Electronic Keying

Configure Your FLEX I/O Module with RSLogix 5000 Software 23

4. Click the Connection tab. Specify a value for the Requested Packet Interval (RPI).

5. Click the Module Info tab to see Module Identification and Status information. These fields are populated when the module goes online.

6. Click the Input Configuration tab and specify the values for the following fields:

•Channel

•Sensor

•Sensor Mode

• Input Filter Cutoff

• Data Format

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24 Configure Your FLEX I/O Module with RSLogix 5000 Software

Configuration Parameters

Field Name Description Configuration Options

Sensor Allows you to select the main sensor function of your

module, whether Thermocouple or RTD. You will need to configure your module based on this main configuration by specifying the next parameters.

Sensor Type Allows you to select one of nine thermocouple types

or one of eight RTD types. Default unit is mV for thermocouples and ohms for RTDs.

Thermocouple RTD

For Thermocouple

mV Type B Type E Type J Type K Type TXK/XKL(L) Type N Type R Type S Type T

For RTD

Resistance 100 ohm Pt 385 200 ohm Pt 385 100 ohm Pt 3916 200 ohm Pt 3916 100 ohm Ni 618 200 ohm Ni 618 120 ohm Ni 672 10 ohm Cu 427

To help you select the proper operating range of your thermocouple, see Resolution Curves for Thermocouples, on page 65.

To help you specify the value for your RTD, see Sensor Types, on page

29.

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Configure Your FLEX I/O Module with RSLogix 5000 Software 25

Configuration Parameters

Field Name Description Configuration Options

Sensor Mode Allows you to select the operational mode for the

thermocouple or RTD inputs. For thermocouple inputs, you can choose the cold junction compensation mode. For RTD inputs, you can choose 2-wire, 2-wire with user selected RTD offset, 3-wire, and 4-wire. Default for thermocouples is external compensation; default for RTDs is 2-wire (with no offsets).

For Thermocouple

External compensation Internal compensation No compensation Differential compensation

For RTD

2-wire compensation (default) 2-wire with Loop compensation 3-wire 4-wire

For a description of the different sensor mode options, for both Thermocouple and RTD, see Bit/Word Descriptions for Block Transfer Write Words, on page 34.

When you select Internal Compensation for your Thermocouple, you need to specify a corresponding Reference Junction value. This parameter sets a fixed reference junction to compensate all thermocouple channels and ranges from 0 °C…70 °C.

When you select 2-wire with Loop compensation for your RTD, you need to specify values for each channel for the RTD Loop Compensation.

Input Filter Cutoff Allows you to select one of eight levels on input

filtering. The single pole, low pass filtering is accomplished by the module microprocessor. The filter selections range from Hardware Only to 5 s time constant. The times are approximate because they are based on the module scan time, which varies. The default is Hardware Only.

Data Format Allows you to specify the format of the data reported.

Module defaults to -4000…10000 in millivolt mode, and 0…5000 in Ω mode with implied decimal points (i.e. -40.00mV, 0.1 Ω) whenever °C, °F, °K is selected.

7. After you have completed all the Module Configuration parameters, click OK in the Module Properties dialog box.

Hardware Filter Only (default) 25 ms 100 ms 250 ms 500 ms 1 s 2 s 5 s

°C °F °K

-32767…32767 0…65535

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26 Configure Your FLEX I/O Module with RSLogix 5000 Software

You should see the FLEX I/O module in the I/O Configuration tree.

To be able to check if your configured parameters are acceptable and the configuration is successful, you need to go online.

Refer to the RSLogix 5000 Online Help for detailed descriptions of the configuration parameters.

Chapter Summary

This chapter provided instructions and required parameters for setting up your FLEX I/O module on an EtherNet/IP network.

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Chapter

Read and Write Configuration Maps for the FLEX I/O Module

Overview

Configure Your Input Module

This chapter describes how to configure, read data from, and map data to your FLEX I/O Thermocouple, RTD, and mV Input module.

Topic Page

Configure Your Input Module 27 Configurable Options and Their Effect on the Channels 27 Sensor Types 29 Read Data From the Module 30 Map Data for the Module 30 Using Series A Functionality in a Series B Module 38 Chapter Summary 38

The Thermocouple, RTD, and mV input module is configured using a group of data table words mapped by the processor that is used when the connection to the module is established.

The software configurable features available are:

• input range selection

• selectable single pole low pass filter

• data reported in °F, °C, °K, mV,

• fault detection

Ω, unipolar or bipolar count

Configurable Options and

There are two types of configurable options: those that affect all channels, and those that affect each group of 4 input channels.

Their Effect on the Channels

Options that Affect All Channels

Input Filter Selection

This combination of bits allows you to select one of eight levels on input filtering. The single pole, low pass filtering is accomplished by the module

27 Publication 1794-6.5.12 - September 2011

28 Read and Write Configuration Maps for the FLEX I/O Module

microprocessor. The filter selections range from Hardware Only to 5 s time constant. The times are approximate because they are based on the module scan time, which varies. The default is Hardware Only.

Data Format Selection

This set of bits allows you to select one of these five formats:

• Degree C

• Degree F

• Degree K

• Unipolar – The end points for Unipolar are scaled to the end points of

the thermocouple or RTD range. The default unit is mV.

• Bipolar – The end points for Bipolar are scaled to the end points of the thermocouple or RTD range. It uses

Options that Affect Each Group of Four Inputs

Ω as default unit.

Sensor Type

This set of bits allows you to select one of nine thermocouple types or one of eight RTD types. Default unit is mV for thermocouples and ohms for RTDs.

Sensor Mode

This set of bits allows you to select the operational mode for the thermocouple or RTD inputs. For thermocouple inputs, you can choose the cold junction compensation mode: internal, external, no CJC and differential measurement between 2 channels, for example, the value of channel 0 minus the value of channel 1 appears in the channel 0 and channel 1 data table locations. For RTD inputs, you can choose 2-wire, 2-wire with user selected RTD offset, 3-wire, and 4-wire. Default for thermocouples is external CJC; default for RTDs is 2-wire (with no offsets).

Input Types

This set of bits allows you to select one of two input types: thermocouple (millivolt) or RTD (resistance). The default input type is thermocouple.

Reference Junction

Publication 1794-6.5.12 - September 2011

These bits allow you to select from seven fixed temperatures for the CJC value that is used by the module in thermocouple mode. Use this mode when the ambient temperature surrounding the thermocouple connection point is known and steady. The default temperature is 0 °C (32 °F).

Read and Write Configuration Maps for the FLEX I/O Module 29

Fault Mode

You can enable or disable the fault detection. When enabled in thermocouple mode, each channel is monitored for an open circuit. If an open is detected, the overrange and fault bits are set for that channel, and the channel data is set to the maximum value (Series A), or minimum value (Series B) for the chosen mode of operation.

When enabled in RTD mode, each channel is monitored for an open circuit (RTD and wires) and short circuits (RTD). If an open is detected, the overrange and fault bits are set for that channel, and the channel data is set to the maximum value for the chosen mode of operation. If a short is detected, the underrange bits is set for that channel, except when in

Ω mode. The

channel data is set to the minimum value for the chosen mode of operation.

RTD Offset

You can select from four fixed resistive values used by the module when inputs are configured for 2-wire with user selected RTD offset. The RTD offset is used to nullify the effects of the resistance of long lead wires. Each value represents the total resistance of both leads of a 2-wire RTD. For example, if you choose 5

Ω, the module compensates for a total of 5 Ω of lead resistance.

Sensor Types

You can perform a calibration operation that measures the actual total lead resistance with RTD replaced with a short circuit. The value stored from this operation is used when the option Use Channel Loop Compensation Value is selected. This is also the default setting and is initially set to 0 at the factory. Each channel has its own pair of RTD offset bits and a Channel Loop Compensation value.

Individual input channels are configurable to operate with the following sensor types:

RTD Type Thermocouple Type

Sensor type for channels 0…3 Sensor type for channels 0…3 Sensor type for channels 4…7 Sensor type for channels 4…7 Resistance (default) mV (default)

Ω Pt α = 0.00385 Euro (-200…+870 °C) (-328…1598 °F) B 300…1800 °C (572…3272 °F)

100

Ω Pt α = 0.00385 Euro (-200…+400 °C) (-328…752 °F) E -270…1000 °C (-454…1832 °F)

200

Ω Pt α = 0.003916 U.S. (-200…+630 °C) (-328…1166 °F) J -210…1200 °C (-346…2192 °F)

100

Ω Pt α = 0.003916 U.S. (-200…+400 °C) (-328…752 °F) K -270…1372 °C (-454…2502 °F)

200

Ω Nickel α = 0.00618 (-60…+250 °C) (-76…482 °F) TXK/XK(L) -200…800 °C (-328…1472 °F)

100

Ω Nickel α = 0.00618 (-60…+200 °C) (-76…392 °F) N -270…1300 °C (-450…2372 °F)

200

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30 Read and Write Configuration Maps for the FLEX I/O Module

ATTENTION

WARNING

RTD Type Thermocouple Type

120 Ω Nickel α = 0.00672 (-80…+320 °C) (-112…608 °F) R -50…1768 °C (-58…3214 °F)

Ω Copper α = 0.00427 (-200…+260 °C) (-328…500 °F) S -50…1768 °C (-58…3214 °F)

You select individual channel ranges using write word 1 of the block transfer write instruction.

…400 °C (-454…752 °F)

T -270

Disconnecting and reconnecting RTDs with power applied temporarily disturbs the steady state data of the channel. Allow 2 minutes for settling time or cycle power to the module after terminating connections.

If using RTD isolators, we recommend using 2- or 4-wire configurations only and digital filtering to the inputs.

Read Data From the Module

The range -32768…32767 should only be used with mV selection. Signals from a thermocouple or RTD are non-linear, the mV selection is

not recommended for thermocouple or RTD real time readings. If selected, the module will return the mV generated by the

thermocouple or RTD, in addition to any offsets generated by wiring without any correction for the non-leanearity of the device.

Also, when the module is configured for mV the CJC compensation is not applied for thermocouple devices.

For thermocouples and RTDs you should use F or C data format. When configured as thermocouple or RTD the module will use an internal table to adjust for the non-linear mV returned by the field devices. After the internal calculations are preformed the module will provide results in degrees F or C.

Read programming transmits status and data from the TC and RTD input module to the processor data table in one I/O scan. The processor user program initiates the request to transfer data from the TC and RTD input module to the processor.

Map Data for the Module

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The following read and write words and bit/word descriptions describe the information written to and read from the TC and RTD input module. The

Read and Write Configuration Maps for the FLEX I/O Module 31

45333

module uses up to 11 words of input data and up to 4 words of output data. Each word is composed of 16 bits.

Thermocouple and RTD Input Module Image Table Mapping

Module Image

Input Data Channel 0

I/O Image Input Size

1...11 Words

Overrange

Channel Faults

Output Size

0...4 Words

Input Data Channel 1 Input Data Channel 2

Input Data Channel 3 Input Data Channel 4 Input Data Channel 5

Input Data Channel 6 Input Data Channel 7

Underrange

SAB

EDT command and data response

RTD Offsets for each channel

EDT command and data

DiagnosticsCJC

Filter CutReference JctData Format FM

Sensor TypeSensor TypeMode ModeTC/RTDTC/RTD

Block Transfer Read and Write

The following block transfer read and write word bit information is presented for experienced users only.

Input Map (Block Transfer Read)

Dec. 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Oct. 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Word 0 Channel 0 Input Data Word 1 Channel 1 Input Data Word 2 Channel 2 Input Data Word 3 Channel 3 Input Data Word 4 Channel 4 Input Data Word 5 Channel 5 Input Data

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32 Read and Write Configuration Maps for the FLEX I/O Module

Input Map (Block Transfer Read)

Dec. 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Oct. 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Word 6 Channel 6 Input Data Word 7 Channel 7 Input Data Word 8 Overrange Alarm Bits (channel 0 = bit 8, and so on.) Underrange Alarm Bits (channel 0 = bit 0, and so on.) Word 9 Ch 7

Word 10 Resp

Where: Ch Flt = Channel Fault

Output Map (Block Transfer Write)

Dec. 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Oct. 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Word 0 Reserved Data Format Flt

Word 1 TC/RTD

Ch 4…7

Word 2 RTD Offset

Ch 7

Word 3 Cmd

Flag

Where: Flt = Fault

Ch = Channel TC/RTD = Thermocouple/Resistance Temperature Detector EDT = Extended Data Transfer

Ch 6

Ch 5

Ch 4

Ch 3

Ch 2

Ch 1

Ch 0

Res CJC2

Flt

Command Response Response Data

Flag

CJC = Cold Junction Compensation SAB = Series of unit; 0 = Series A, 1 = Series B Alm = Alarm

Sensor Mode Ch 4…7

RTD Offset Ch 6

EDT Command EDT Command Data

Sensor Type Ch 4…7

RTD Offset Ch 5

RTD Offset Ch 4

Alm

Flt Mode Ch 4…7

TC/RTD Ch 0…3

RTD Offset Ch 3

Mode

0…3

CJC1

SAB CJC

Alm

Reference Jct. Filter Cutoff

Sensor Mode Ch 0…3

RTD Offset Ch 2

Status

Reserved

Sensor Type Ch 0…3

RTD Offset Ch 1

RTD Offset Ch 0

Publication 1794-6.5.12 - September 2011

Bit/Word Descriptions for the Input Module Block Transfer Read Words

Word Dec. Bits

(Octal Bits)

Read Word 0 00…15

(00…17)

Read Word 1 00…15

(00…17)

Read Word 2 00…15

(00…17)

Description

Channel 0 Input data

Channel 1 Input data

Channel 2 Input data

Read and Write Configuration Maps for the FLEX I/O Module 33

Read Word 3 00…15

Channel 3 Input data

(00…17)

Read Word 4 00…15

Channel 4 Input data

(00…17)

Read Word 5 00…15

Channel 5 Input data

(00…17)

Read Word 6 00…15

Channel 6 Input data

(00…17)

Read Word 7 00…15

Channel 7 Input data

(00…17)

Read Word 8 00…07 Underrange bits – these bits are set if the input

signal is below the minimum range of the input channel. Bit 00 corresponds to channel 0…bit 07 corresponds to channel 7.

08…15 (10…17)

Overrange bits – these bits are set if 1), the input signal is above the maximum range of the input channel; or 2), an input is disconnected. Bit 08 (10) corresponds to channel 0, bit 09 (11) corresponds to channel 1, and so on.

Read Word 9 00…03 Diagnostic bits – represent module configuration

and/or hardware errors. Bit03020100

0 0 0 0 Reserved for factory use 0 0 1 0 Improper module

configuration 0110RAM fault 0 1 1 1 EEPROM fault 0001, 0100, and 0011…1111 Reserved for

factory use

04 Series of Unit (SAB) – 0 = Series A, 1 = Series B 05…06 Cold junction compensation fault bits – These

bits are set (1) when the corresponding cold junction compensator lead is broken, unattached or shorted, and the thermocouple is set to "external compensation.” Bit 05 corresponds to CJC1, and bit

06 to CJC2. 07 Not used 08…15

(10…17)

Fault alarm bits – An alarm bit is set (1) when an

individual input lead opens (broken, disconnected). If

the alarm is enabled, the channel reads maximum

value. Bit 08 (10) corresponds to input channel 0, bit

09 (11) to channel 1, and so on.

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34 Read and Write Configuration Maps for the FLEX I/O Module

Word Dec. Bits

Read Word 10 00…07 Extended data table data response bits – These

Bit/Word Descriptions for Block Transfer Write Words

Word Dec. Bits

(Octal Bits)

Description

Write Word 0 00…02 Input Filter Selection bits

Bit 02 01 00 Filter Time Constants – actual filtering depends on the module mode of

0 0 0 Hardware filtering only (default filtering) 0 0 1 25 ms 0 1 0 100 ms 0 1 1 250 ms 1 0 0 500 ms 1011s 1102 s 1115 s

Bits 03…05 Reference Junction – used when input type is set to thermocouple and sensor mode is set to

internal compensation. Sets a fixed reference junction to compensate all thermocouple channels. Bit 05 04 03 Reference Junction

0 0 0 0 °C (32 °F) 0 0 1 20 °C (68 °F) 0 1 0 25 °C (77 °F) 0 1 1 30 °C (86 °F) 1 0 0 40 °C (104 °F) 1 0 1 50 °C (122 °F) 1 1 0 60 °C (140 °F) 1 1 1 70 °C (158 °F)

Bits 06…07 Fault Mode bits – when a bit is set (1), fault mode is enabled for that channel. Bit 06 corresponds to

channels 0…3; bit 07 corresponds to channels 4…7. 0 = Disabled 1 = Enable wire-off detection

Bits 08…11 (10…13)

Data format – module defaults to -4000…10000 in millivolt mode, and 0…5000 in implied decimal points (i.e. -40.00mV, 0.1 Ω) whenever °C, °F, °K is selected.

Description

(Octal Bits)

bits echo the EDT command data written to the module during calibration.

08…14 (10…16)

Extended data table command response bits – These bits echo the EDT command written to the module during calibration.

15 (17) Reserved for factory use

operation

Ω mode with

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Bit/Word Descriptions for Block Transfer Write Words

Read and Write Configuration Maps for the FLEX I/O Module 35

Word Dec. Bits

Write Word 0 (continued)

(Octal Bits)

Bits 08…11 (10…13)

Description

Bit 11 10 09 08 Data type for channels 0…7

0 0 0 0 °C (implied decimal point xxxx.x) 0 0 0 1 °F (implied decimal point xxxx.x) 0 0 1 0 °K (implied decimal point xxxx.x) 0 0 1 1 -32767…+32767 0 1 0 0 0…65535 0101…1111 not used

Bits 12…15

Not used

(14…17)

Write Word 1 Bits 00…03 Sensor Type (Thermocouple or RTD)

RTD Type

Bit 03 02 01 00 Sensor type for channels 0…3

0 0 0 0 Resistance (default) 0 0 0 1 100 Ω Pt α = 0.00385 Euro (-200…+870 °C) (-328…1598 °F) 0 0 1 0 200 Ω Pt α = 0.00385 Euro (-200…+400 °C) (-328…752 °F) 0 0 1 1 100 Ω Pt α = 0.003916 U.S. (-200…+630 °C) (-328…1166 °F) 0 1 0 0 200 Ω Pt α = 0.003916 U.S. (-200…+400 °C) (-328…752 °F) 0 1 0 1 100 Ω Nickel (-60…+250 °C) (-76…482 °F) 0 1 1 0 200 Ω Nickel (-60…+200 °C) (-76…392 °F) 0 1 1 1 120 Ω Nickel (-80…+320 °C) °F) (-112…608 °F) 1 000 10 Ω Copper (-200…+260 °C) °F) (-328…500 °F) 1001…1111 not used

Thermocouple Type

Bit 03 02 01 00 Sensor type for channels 0…3

0 0 0 0 mV (default) 0 0 0 1 B 300…1800 °C (572…3272 °F) 0 0 1 0 E -270…1000 °C (-454…1832 °F) 0 0 1 1 J -210…1200 °C (-346…2192 °F) 0 1 0 0 K -270…1372 °C (-454…2502 °F) 0 1 0 1 TXK/XK(L) -200…800 °C (-328…1472 °F) 0 1 1 0 N -270…1300 °C (-450…2372 °F) 0 1 1 1 R -50…1768 °C (-58…3214 °F) 1 0 0 0 S -50…1768 °C (-58…3214 °F) 1 0 0 1 T -270…400 °C (-454…752 °F) 1010…1111 not used

Bits 04…05 Sensor Mode Select bits

Bit 05 04 Sensor mode select for channels 0…3

Thermocouple

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36 Read and Write Configuration Maps for the FLEX I/O Module

Bit/Word Descriptions for Block Transfer Write Words

Word Dec. Bits

(Octal Bits)

Write Word 1 (continued)

Bits 06…07 Input Type Select

Bits 08…11 (10…13)

Description

00External compensation – uses cold junction sensors. Both CJC sensors must be

used when external compensation is selected.

01Internal compensation – uses the user selected Reference Junction Selection. 1 0 No compensation. Data is referenced to 0 °C (32 °F). 1 1 Differential measurement between 2 channels (0…1, 2…3, 4…5, 6…7)

RTD

0 0 2-wire RTD no compensation 0 1 2-wire RTD with user selected RTD offset 1 0 3-wire RTD 1 1 4-wire RTD

Bit 07 06 Input type selection for channels 0…3

0 0 Thermocouple 01RTD 1 0 Not used 1 1 Not used

Sensor Type (Thermocouple or RTD) RTD Type

Bit 11 10 09 08 Sensor type for channels 4…7

0 0 0 0 Resistance (default) 0 0 0 1 100 Ω Pt α = 0.00385 Euro -200…+870 °C (-328…1598 °F) 0 0 1 0 200 Ω Pt α = 0.00385 Euro -200…+400 °C (-328…752 °F) 0 0 1 1 100 Ω Pt α = 0.003916 U.S. -200…+630 °C (-328…1166 °F) 0 1 0 0 200 Ω Pt α = 0.003916 U.S. -200…+400 °C (-328…752 °F) 0 1 0 1 100 Ω Nickel -60…+250 °C (-76…482 °F) 0 1 1 0 200 Ω Nickel -60…+200 °C (-76…362 °F) 0 1 1 1 120 Ω Nickel -80…+320 °C (-112…608 °F) 1 0 0 0 10 Ω Copper -200…+260 °C (-328…470 °F) 1001…1111 not used

Thermocouple Type

Bit 11 10 09 08 Sensor type for channels 4…7

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Bit/Word Descriptions for Block Transfer Write Words

Read and Write Configuration Maps for the FLEX I/O Module 37

Word Dec. Bits

(Octal Bits)

Bits 12…13 (14…15)

Bits 14…15 (16…17)

Write Word 2 00…15

(00…17)

Description

1 0 0 1 T -270…400 °C (-454…752 °F) 1010…1111 not used

Sensor Mode Select bits

Bit 13 12 Sensor mode select for channels 4…7

Thermocouple

00External compensation – uses cold junction sensors. Both CJC sensors must be

used when external compensation is selected.

01Internal compensation – uses the user selected Reference Junction. 1 0 No compensation. Data is referenced to 0 °C (32 °F). 1 1 Differential measurement between 2 channels.

RTD

0 0 2-wire RTD no compensation 0 1 2-wire RTD with user selected offset 1 0 3-wire RTD 1 1 4-wire RTD

Input Type Select

Bit 15 14 Input type selection for channels 4…7

0 0 Thermocouple 0 1 RTD 1 0 Not used 1 1 Not used

RTD offset select bits – used when input type is set to RTD and sensor mode select is set to 2-wire with user selected RTD offset. Allows you to set the type of RTD loop resistance compensation used for all RTDs or one of three fixed values for all channels.

NOTE: Not applicable to 10 Ω copper RTD. Bit 01 00 RTD Offset Select Bits – channel 0

03 02 RTD Offset Select Bits – channel 1 05 04 RTD Offset Select Bits – channel 2 07 06 RTD Offset Select Bits – channel 3 09 08 RTD Offset Select Bits – channel 4 11 10 RTD Offset Select Bits – channel 5 13 12 RTD Offset Select Bits – channel 6 15 14 RTD Offset Select Bits – channel 7 0 0 Use channel loop compensation value stored during calibration procedure for 2-wire

RTD (default = 0 Ω) 015 Ω (total lead resistance) 1010 Ω (total lead resistance) 1 1 15 Ω

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38 Read and Write Configuration Maps for the FLEX I/O Module

ATTENTION

Bit/Word Descriptions for Block Transfer Write Words

Word Dec. Bits

(Octal Bits)

Write Word 3 00…07 Extended data table data bits – These bits are written to the module during calibration. They are

08…14 (10…16)

15 (17) Reserved for factory use only

Using Series A Functionality in a Series B Module

Description

used to define offset, gain and general channel calibration. Extended data table command bits – These bits are written to the module during calibration. They

are used to select channel calibration action.

To employ Series A functionality when using a Series B 1794-IRT8 module, connect a wire from terminal 39 to terminal 48 on the 1794-TB3G or 1794-TB3GS terminal base unit. When terminals 39 and 48 are wired together, bit 4 in read word 9 will not be set (0), indicating the module is in Series A functionality.

If these terminals are not connected together, the Series B product will default to Series B functionality.

Chapter Summary

This chapter provided the user with data and instructions to configure and map data for the FLEX I/O Thermocouple, RTD, and Millivolt Input module.

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Calibrate Your Module

ATTENTION

IMPORTANT

Chapter

Overview

This chapter provides the tools and equipment, and procedure for calibrating your FLEX I/OThermocouple, RTD, and mV input module.

Topic Page

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 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

When and How to Calibrate Your FLEX I/O Module

39 Publication 1794-6.5.12 - September 2011

This module is shipped to you already calibrated. If a calibration check is required, the module must be in a FLEX system. We recommend recalibrating your module, if the module is going to be used in an environment with temperature other than 25 °C (77 °F) and 30% humidity.

Perform module calibration periodically, based on your application, or at least once a year. Module calibration may also be required to remove module error caused by aging components in your system.

Offset calibration must be done first, followed by gain calibration.

You must use a 1794-TB3G or 1794-TB3GS terminal base when calibrating this module.

Calibration can be accomplished using the manual calibration procedure described in the following sections.

40 Calibrate Your Module

ATTENTION

IMPORTANT

Tools and Equipment

Calibrate Your Input Module

To calibrate your Thermocouple, RTD, and mV input module, you will need the following tools and equipment:

Tool or Equipment Description

Precision Resistors High Precision Resistors:

383 W, 0.01%, 5ppm/°C 100 W, 0.01%, 5ppm/°C 10 KΩ, 0.5%, 5ppm/°C

Precision Voltage Source 320 mV, 1 μV resolution Analogic 3100, Data Precision

8200 or equivalent

Industrial Terminal and Interconnect Cable

Programming terminal for Allen-Bradley family processors

You must calibrate the module in a FLEX I/O system. The module must communicate with the processor and an industrial terminal. You can calibrate input channels in any order, or all at once.

To allow the internal module temperature to stabilize, apply power to the module at least 20 minutes before calibration.

When using remote I/O, before calibrating your module, you must enter ladder logic into the processor memory, so that you can initiate block transfer writes (BTW) to the module, and read inputs (BTR) from the module.

To manually calibrate the module:

1. Apply a reference to the desired input(s).

2. Send a message to the module indicating which inputs to read and what

calibration step is being performed (offset).

The module returns a response which echoes the message sent to the module. The module stores this input data.

3. Apply a second reference signal to the module.

4. Send a second message indicating which inputs to read and what

calibration step is being performed (gain).

The module computes new calibration values for the inputs and returns a response which echoes back the message sent to the module. If the calibration cannot be completed, the module returns a fault message.

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Calibration Setup

4 5 6 7 8 9 10 11 12 13 14 150

Using Precision Resistors for 383 Ω and 100 Ω calibration

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

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

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 5134

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 3316

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

1234567891011121314150

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 5134

1794-TB3G

Precision Voltage Source

Using Precision Voltage Source for offset and gain calibration

Connect + to terminals 2, 6, 10, 14, 19, 23, 27, and 31 Connect - to terminals 3, 7, 11, 15, 20, 24, 28 and 32 Connect one 10 K Ω, 0.5% resistor across terminals 37 and 39 and another across 46 and 48.

45357

1 1a

4-wire

RTD

Millivolt

45358

Calibrate Your Module 41

Wiring Connections for Calibrating the Thermocouple and RTD Input Module

Type of Input Connect the following

HL+-Shield

RTD – 4-wire 1a 2a 1 2 Millivolt 1 2

Wiring to the 1794-TB3G and 1794-TB3GS Terminal Base Units

RTD or

1794-TB3G and 1794-TB3GS Terminal Base Units

Thermocouple Channel

High Signal Terminal (H)

Low Signal Terminal (L)

RTD Source Current (+)

01203 15647 2910811 313141215 418191720 522232124 626272528

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(1)

Signal Return (-)

42 Calibrate Your Module

Wiring to the 1794-TB3G and 1794-TB3GS Terminal Base Units

RTD or

1794-TB3G and 1794-TB3GS Terminal Base Units

(1)

Thermocouple Channel

High Signal Terminal (H)

Low Signal Terminal (L)

RTD Source Current (+)

Signal Return (-)

730 312932 24V DC Power 34 and 50 24V DC

35 and 51

Common

(1)

Terminals 16, 33 and 40…45 are chassis ground.

Read and Write Words for Calibration

The following tables provide read and write words for module calibration.

Write Words for Calibration

Decimal 151413121110090807 06 05 04 03 02 01 00 Octal 171615141312111007 06 05 04 03 02 01 00

⇓ Write

Word

0 Reserved Data Format Flt

Mode Ch 0…3

1TC/RTD

Ch. 4…7

Sensor Mode

Sensor Type Ch 4…7 TC/RTD Ch.

0…3

Flt Mode Ch 4…7

Ch 4…7

2 RTD Offset

Ch 7

RTD Offset Ch 6

RTD Offset Ch 5

RTD Offset Ch 4

RTD Offset Ch 3

3 EDT command EDT command data

Reference Junction Filter Select

Sensor Mode

Sensor Type Ch 0…3

Ch 0…3

RTD Offset Ch 2

RTD Offset Ch 1

RTD Offset Ch 0

Where: Flt = Fault

TC/RTD = Thermocouple/Resistance Temperature Detector EDT = Extended Data Transfer

Read Words for Calibration

Decimal15141312111009080706050403020100 Octal 17161514131211100706050403020100 Word⇓ Read

0 Channel 0 Input Data 1 Channel 1 Input Data 2 Channel 2 Input Data 3 Channel 3 Input Data 4 Channel 4 Input Data

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Calibrate Your Module 43

ATTENTION

Read Words for Calibration

Decimal15141312111009080706050403020100 Octal 17161514131211100706050403020100 Word⇓ Read

5 Channel 5 Input Data 6 Channel 6 Input Data 7 Channel 7 Input Data 8 Overrange Alarm Bits (channel 0 = bit 08, and so on.) Underrange Alarm Bits (channel 0 = bit 00, and so on.) 9 Ch7

10 EDT command response EDT data response Where: Flt = Fault

Ch6

Ch5

Ch4

Ch3

Ch2

Ch1

Flt

CJC = Cold Junction Compensation SAB = Series of unit; 0 = Series A; 1 = Series B

Ch0 Flt

CJC 2 Flt

CJC 1 Flt

SAB Diagnostic Status

The CJC Status bit, Read Word 9, Bit 3 is added with the Firmware C release of the 1794-IRT8 Series B module.

The CJC Status bit is turned On when the temperature between the CJCs is greater than 6 °C but less than 12 °C.

When this temperature difference is above 12 °C, then the CJC Alarm bits are set.

Also, if a CJC temperrature is over-range or under-range, then the associated CJC Alarm bit is set. In this condition, the CJC Status bit is not set.

The CJC Status bit does not exist in Series A.

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44 Calibrate Your Module

EDT Calibration Command and Command Data Summary

Config Word 3 EDT Command

Meaning Config Word 3

bits 4…7

Config Word 3 bits 0…3

bits 8…15

Dec. (Hex) Channel No. Command data 4 (4) General calibration

0…7 1 Channel internal current source

by channel

0…7 2 Channel internal current source

0…7 3 Loop channel compensation for

0…7 4 CJC calibration

5 (5) Offset calibration

0…7 0 gain= 1, input = -320 mV

by channel

0…7 1 gain = 2, input = 0.0 mV 0…7 2 gain = 4, input = -50 mV 0…7 3 gain = 8, input = -10.0 mV 0…7 4 gain = 16, input = -9 mV 0…7 5 gain = 32, input = 1.0 mV

6 (6) Gain calibration by

0 gain = 1, input = 320 mV

channel

1 gain = 2, input = 320 mV 2 gain = 4, input = 110 mV

Meaning

and current sense resistor, with 4-wire external 383 Ω inputs

and current sense resistor with 4-wire external 100 Ω inputs

2-wire RTD

36 (24) Calibration all

Publication 1794-6.5.12 - September 2011

channels General calibration

all channels

Offset calibration all channels

3 gain = 8, input = 70 mV 4 gain = 16, input = 29 mV 5 gain = 32, input = 19 mV

0 1 Channel internal current source

and current sense resistor, with 4-wire external 383 Ω inputs

0 2 Channel internal current source

and current sense resistor with 4-wire external 100 Ω inputs

0 3 Loop channel compensation for

2-wire RTD 0 4 CJC calibration 1 0 gain = 1, input = -320 mV

Calibrate Your Module 45

Config Word 3 EDT Command bits 8…15

Meaning Config Word 3

bits 4…7

1 1 gain = 2, input = 0.0 mV 1 2 gain = 4, input = -50 mV 1 3 gain = 8, input = -10.0 mV 1 4 gain = 16, input = -9 mV 1 5 gain = 32, input = 1.0 mV

Gain calibration all channels

2 0 gain = 1, input = 320 mV

2 gain = 2, input = 320 mV 2 gain = 4, input = 110 mV 2 gain = 8, input = 70 mV 2 gain = 16, input = 29 mV 2 gain = 32, input = 19 mV

Offset Calibration

Config Word 3 bits 0…3

Meaning

Inputs can be calibrated one at a time or all at once. To calibrate the offsets, proceed as follows:

1. Apply power to the module for 20 minutes before calibrating.

2. Connect a precision millivolt source across each input channel. Set the

source to -320.00 mV for a gain of 1. Connect all (L) signal terminals together and attach to the positive lead from the precision voltage source. Connect all (-) signal terminals together and attach to the negative lead.

EDT Commands for Offset Calibration

All Channels Single Channel

EDT

EDT Command

Gain Selected

1 -320.00 + 0.064 mV 2410 9232 05

2 0.000 + 0.032 mV 2411 9233 05

4 -50.00 + 0.016 mV 2412 9234 05

Input (mV) Hex Decimal Bits

Command Dec. or Hex Bits 8

…15

EDT Command Data Dec. or Hex

Bits

…7 …7 …7 …7

0…3

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46 Calibrate Your Module

EDT Commands for Offset Calibration

All Channels Single Channel

EDT Command

Gain Selected

Input (mV) Hex Decimal Bits

EDT Command Dec. or Hex Bits 8

…15

EDT Command Data Dec. or Hex

Bits

…7

0…3

8 -10.00 + 0.008 mV 2413 9235 05

16 -9.00 + 0.004 mV 2414 9236 05

32 1.000 + 0.002 mV 2415 9237 05

…7 …7 …7

3. Initiate a write to the module with the appropriate value in the EDT command location (write word 3, bits 00…15), as shown above.

4. Monitor the EDT response location (read word 11 bits 00…15) for an echo of the EDT command. Depending on which command you sent, it should show 241X Hex.

If the EDT response word reads 80FF (hex), repeat the step 3. Make sure that sufficient time is allowed for the module to respond to your request. If there is no change, calibration has failed. Check the wiring and try again.

5. Set the precision millivolt source to the value required for a gain of 2. Repeat steps 3 and 4 for gain 2. Repeat for each gain setting.

6. When all offset calibrations are successful, proceed to the gain calibration.

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Gain Calibration

After completing the offset calibration, proceed with the gain calibration.

1. Connect a precision millivolt source across each input channel. Set the source to 320.00 mV for a gain of 1. Connect all (L) signal terminals together and attach to the positive lead from the precision voltage source. Connect all (-) signal terminals together and attach to the negative lead.

EDT Commands for Gain Calibration

All Channels Single Channel

EDT Command EDT

Gain Selected

Input (mV) Hex Decimal Bits

Calibrate Your Module 47

EDT Command

Data Command Dec. or Hex Bits 8

…15

Dec. or Hex

…7

Bits 0…3

1 -320.00 + 0.064 mV 2420 9248 06

2 320.00 + 0.032 mV 2421 9249 06

4 110 + 0.016 mV 2422 9250 06

8 70.00 + 0.008 mV 2423 9251 06

16 29.00 + 0.004 mV 2424 9252 06

32 19.00 + 0.002 mV 2425 9253 06

…7 …7 …7 …7 …7 …7

2. Apply power to the module for 20 minutes before calibrating.

3. After the connections stabilize, initiate a write word with the appropriate

EDT command location (write word 3, bits 00…15) as shown above.

4. Monitor the value in the EDT response location (read word 11, bits 00…15) for an echo of the EDT command. Depending on which command you sent, it should show 242X Hex.

If the EDT response word reads 80FF (hex), repeat step 3. Make sure to allow for sufficient time for the module to respond to your request. If there is no change, calibration has failed. Check the wiring and try again.

5. Set the precision millivolt source to the value required for a gain of 2. Repeat steps 3 and 4 for gain 2. Repeat for each gain setting.

When all gain calibrations are successful, proceed to perform Current Source Calibration on page 47.

Current Source Calibration

The current sources can be calibrated one at a time or all at once. To calibrate all the current sources, proceed as follows:

1. Connect a 383 channel (8 resistors).

2. Apply power to the module for 20 minutes before calibrating.

Ω, 0.01% resistor across (H, +) and (L, -) of each input

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48 Calibrate Your Module

3. Initiate a write to the module with 2401 (hex) value in EDT command

location (word 3, bits 00…15), as shown, for calibrating all channels at once. For individual channel calibrations, use the 04X1 (hex) (0401, 0411, 0421, ...0471 hex).

4. Monitor the EDT response location (read word 10, bits 00…15) for an

echo of the EDT command.

5. Connect a 100

Ω, 0.01% resistor across (H, +) and (L, -) of each input

channel (8 resistors). Repeat steps 3 and 4 using the EDT command value of 2402 (hex) for calibrating all channels at once. For individual channel calibrations, use the 04X2 (hex) (0402, 0412, 0422, ...0472 hex).

When all calibrations are successful, proceed to the Cold Junction Calibration on page 47.

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Calibrate Your Module 49

Cold Junction Calibration

Both cold junction compensation inputs must be calibrated at at the same time. To calibrate both at once, proceed as follows:

1. Connect 10 K terminals 46 and 48 (CJC 2).

2. Apply power to the module for 20 minutes before calibrating.

3. Initiate a write to the module with 2404 (hex) value in the EDT

command location (word 3, bits 00…15).

4. Monitor the EDT response location (read word 11, bits 00…15) for an echo of the EDT command.

If the EDT response word reads 80FF (hex), repeat step 3. Make sure that sufficient time is allowed for the module to respond to your request. If there is no change, calibration has failed. Check the wiring and try again.

Ω, 0.5% resistors across terminals 37 and 39 (CJC 1) and

Channel Loop Compensation Calibration

Each 2-wire RTD can be calibrated individually, or at the same time. Proceed as follows.

1. Short circuit the end of each input cable at the RTD element. Do this for all the channels to be calibrated.

Chapter Summary

2. Apply power to the module for 20 minutes before calibrating.

3. Initiate a write to the module with 2403(hex) (calibrate all channels) in

the EDT command location (write word 3, bits 00…15). For individual channel calibrations, use 04X3 (hex) (0403, 0413, 0423, ...0473).

4. Monitor the EDT response location (read word 1X, bits 00…15) for an echo of the EDT command.

This chapter provided the user with instructions on how to calibrate your FLEX I/O Thermocouple, RTD, and mV input module.

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50 Calibrate Your Module

Notes:

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Troubleshoot the Module

A – Insertable label for writing individual input designations B – Fault Indicator - indicates noncritical fault C – Power Indicator - indicates power applied to module A

AB C

Chapter

Overview

Module Indicators

This chapter provides a description of the different status indicators for the FLEX I/O Thermocouple, RTD, and mV module to help you troubleshoot.

The FLEX I/O module has one status indicator (PWR) that is On when power is applied to the module, and one fault indicator (F) for each input.

TC RTD INPUT 8 CHANNEL

IN 0 IN 2 IN 4 IN 6IN 1 IN 3 IN 5 IN 7

FFFFFFFF

1794-IRT8

PWR

Status Indicators

Indicator Color State Description

Fault Red On At power up – Channel 0 indicator lights at power up until all internal

diagnostics are checked. After successful power up, the indicator goes off if no fault is detected and the module has started communicating with an adapter.

After successful power up – Indicates a critical fault, such as diagnostic failure. If channel indicator stays solid red after power up, there is an internal module error. Try cycling power. If problem persists, replace module.

If channel indicator continues to blink after power up, communication between the module and the adapter has not been established.

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52 Troubleshoot the Module

Status Indicators

Indicator Color State Description

Power Off Module not powered

Blinking (when faults are enabled, and bit set)

Green On Module receiving power

Indicates a noncritical fault (such as open sensor). Input data set to maximum, and indicator flashes at about 1 Hz rate.

The FLEX I/O Thermocouple, RTD, and mV module returns diagnostics to the processor in Word 9 of the block transfer read (BTR) file. These diagnostics give you information on the status or condition of the module.

Diagnostic Bits in Word 9

Word Dec. Bits

(Octal Bits)

Read Word 9 00…03 Diagnostic bits – represent module configuration

04 Series of Unit (SAB) – 0 = Series A, 1 = Series B 05…06 Cold junction compensation fault bits – These

07 Not used 08…15

(10…17)

Description

and/or hardware errors. Bit03020100

0 0 0 0 Reserved for factory use 0 0 1 0 Improper module

configuration 0110RAM fault 0 1 1 1 EEPROM fault 0001, 0100, and 0011…1111 Reserved for

factory use

bits are set (1) when the corresponding cold junction compensator lead is broken, unattached or shorted, and the thermocouple is set to "external compensation.” Bit 05 corresponds to CJC1, and bit 06 to CJC2.

Fault alarm bits – An alarm bit is set (1) when an individual input lead opens (broken, disconnected). If the alarm is enabled, the channel reads maximum value. Bit 08 (10) corresponds to input channel 0, bit 09 (11) to channel 1, and so on.

Chapter Summary

Publication 1794-6.5.12 - September 2011

This chapter specified the different status indicators that would help the user troubleshoot the module.

Specifications

Appendix

Overview

This appendix contains general and environmental specifications and certifications for the FLEX I/O Thermocouple, RTD, mV Input Modules.

General Specifications

Attribute Value

Number of inputs 8 channels (2 groups of 4) Module location Cat. Nos. 1794-TB3G, 1794-TB3GS, 1794-TB3GK Terminal

base units

Nominal input voltage ranges

Supported thermocouple types

Supported RTD types Resistance

-40…100 mV DC for thermocouples 0…325 mV for RTDs mV default

Ty pe

B E J K TXK/XK(L) N R S T

100 Ω Pt α = 0.00385 Euro -200…870 °C (-328…1598 °F) 200 Ω Pt α = 0.00385 Euro -200…400 °C (-328…752 °F) 100 Ω Pt α = 0.003916 U.S. -200…630 °C (-328…1166 °F) 100 Ω Pt α = 0.003916 U.S. -200…400 °C (-328…752 °F)

Range °C

300…1800 °C

-270…1000 °C

-210…1200 °C

-270…1372 °C 200…800 °C

-270…1300 °C

-50…1768 °C

-270…400 °C

Range °F

(572…3272 °F) (-454…1832 °F) (-346…2192 °F) (-454…2502 °F) (-328…1472 °F) (-454…2372 °F) (-58…3214 °F) (-58…3214 °F) (-454…752 °F)

100 Ω Nickel -60…250 °C (-76…482 °F) 200 Ω Nickel -60…200 °C (-76…362) °F) 120 Ω Nickel -80…320 °C (-112…608 °F) 10 Ω Copper -200…260 °C (-328…470 °F)

Resolution 14 bits Accuracy vs. filter cutoff 0.05% of full range in millivolt mode with filtering selected

Hardware only = 0.10% of full range in millivolt mode

Data format °C (implied decimal point XXX.X)

°F (implied decimal point XXX.X) °K (implied decimal point XXX.X)

-32767…32767 0…65535 0…5000 ohms mode (implied decimal point XXX.X)

-4000…+10000 millivolt mode (implied decimal

point XXX.XX) Common mode rejection -80 db @ 5V peak-to-peak, 50…60 Hz Common mode input range +

53 Publication 1794-6.5.12 - September 2011

15V min

54 Specifications

General Specifications

Attribute Value

Isolation voltage (continuous voltage withstand rating)

System throughput (8 channels scanned) – Add

0.5 ms if filtering is selected

Open circuit protection

50V (continuous), Basic Insulation Type Type tested @ 1365V AC for 60 s, between field side and system No isolation between individual channels

Typical module timing is shown here.

7.4 ms - millivolt

8.0 ms - Ω - 2-wire RTD

10.0 ms - Ω - 3-wire RTD

10.4 ms - Ω - 4-wire RTD

8.0 ms - 2-wire RTD (°F)

10.4 ms - 4-wire RTD (°F)

8.8 ms - 2-wire RTD (°C), (°K)

10.8 ms - 4-wire RTD (°C), (°K)

9.8 ms - 3-wire RTD (°F)

10.0 ms - 3-wire RTD (°C), (°K)

9.0 ms - Thermocouples (°F)

9.4 ms - Thermocouples (°C), (°K) RTD mode – Open input – Module defaults to max value

TC mode – Open input – Module defaults to min value To simulate wire-off detection in Series A TC mode when using a Series B module, attach a jumper from terminal 39 to terminal 48 on the 1794-TB3G, 1794-TB3GS, or 1794-TB3GK terminal

base unit so that an open input will default to max value. Open input detection time Immediate detection 2 scans, max Overvoltage capability 15V DC continuous at 25 °C Overall drift with

temperature, max Cold junction

compensation range Cold junction compensator Allen-Bradley catalog number 1794-CJC2 Indicators 1 green power status indicator

FlexBus current 40 mA Power dissipation, max 3.0 W @ 31.2V DC Thermal dissipation, max 10.2 BTU/hr @ 31.2V DC Keyswitch position 3 External DC power

supply voltage

Voltage range Supply current

Dimensions (with module installed in base) HxWxD approx.

Temperature code, IEC T4

50 ppm/°C of span

-20…100 °C

8 red open input indicators

24V DC nom

95 mA @ 24V DC

94 x 94 x 69 mm

(3.7 x 3.7 x 2.7 in.)

Publication 1794-6.5.12 - September 2011

General Specifications

Attribute Value

Temperature code, North American

Enclosure type rating None (open-style) Wire size Determined by installed terminal base Signal conductors

T4A

Specifications 55

Thermocouple Millivolt Wire type

Wiring category

Use appropriate shielded thermocouple wire Belden 8761 Shielded on signal ports

(1)

2 – on signal ports

(2)

3 – on power ports

Terminal screw torque for

Determined by installed terminal base

cage-clamp terminal base

(1)

Refer to the thermocouple manufacturer for proper thermocouple extension.

(2)

Use this category information for planning conductor routing as described in Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley publication 1770-4.1

Environmental Specifications

Attribute Value

Temperature, operating IEC 60068-2-1 (Test Ad, Operating Cold),

IEC 60068-2-2 (Test Bd, Operating Dry Heat), IEC 60068-2-14 (Test Nb, Operating Thermal Shock):

-20…55 °C (-4…131 °F) (1794-IRT8, 1794-IRT8K)

-20…70 °C (-4…158 °F) (1794-IRT8XT)

Temperature, non- operating

IEC 60068-2-1 (Test Ab, Unpackaged Non-operating Cold), IEC 60068-2-2 (Test Bb, Unpackaged Non-operating Dry Heat), IEC 60068-2-14 (Test Na, Unpackaged Non-operating Thermal Shock):

-40…85 °C (-40…185 °F)

Relative humidity IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):

5…95% noncondensing

Vibration IEC 60068-2-6 (Test Fc, Operating):

5 g @ 10…500 Hz

Shock operating nonoperating

IEC60068-2-27 (Test Ea, Unpackaged shock): 30 g 50 g

Emissions CISPR 11:

Group 1, Class A (with appropriate enclosure)

ESD immunity IEC 61000-4-2:

6 kV contact discharges 8 kV air discharges

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56 Specifications

ATTENTION

Environmental Specifications

Attribute Value

Radiated RF immunity IEC 61000-4-3:

10V/m with 1 kHz sine-wave 80% AM from 80…2000 MHz 10V/m with 200 Hz 50% Pulse 100% AM at 900 MHz 10V/m with 200 Hz 50% Pulse 100% AM at 1890 MHz 3V/m with 1 kHz sine-wave 80% AM from 2000…2700 MHz

EFT/B immunity IEC 61000-4-4:

±2 kV at 5 kHz on power ports ±2 kV at 5 kHz on shielded signal ports

Surge transient immunity

IEC 61000-4-5: ±2 kV line-earth(CM) on shielded signal ports

Conducted RF immunity IEC 61000-4-6:

10V rms with 1 kHz sine-wave 80% AM from 150 kHz…80 MHz on shielded signal ports

To comply with the CE Low Voltage Directive (LVD), all connections to this equipment must be powered from a source compliant with the following: Safety Extra Low Voltage (SELV) or Protected Extra Low Voltage (PELV).

Certifications

Certification (when product is marked)

c-UL-us UL Listed Industrial Control Equipment, certified for US and

C-Tick Australian Radiocommunications Act, compliant with:

Value

(1)

Canada. See UL File E65584.

UL Listed for Class I, Division 2 Group A,B,C,D Hazardous

Locations, certified for U.S. and Canada. See UL File E194810.

European Union 2004/108/EC EMC Directive, compliant with:

EN 61326-1; Meas./Control/Lab., Industrial Requirements EN 61000-6-2; Industrial Immunity EN 61000-6-4; Industrial Emissions EN 61131-2; Programmable Controllers (Clause 8, Zone A & B)

AS/NZS CISPR 11; Industrial Emissions

Publication 1794-6.5.12 - September 2011

Ex European Union 94/9/EC ATEX Directive, compliant with:

EN 60079-15; Potentially Explosive Atmospheres, Protection "n" (II 3 G Ex nA IIC T4 X) EN 60079-0; General Requirements (Zone 2)

TÜV TÜV Certified for Functional Safety:

up to and including SIL 2

(1)

See the Product Certification link at http://www.ab.com for Declarations of Conformity, Certificates, and other certification details.

Appendix

Electronic Data Sheet (EDS) Files

Overview

EDS provides the definition for a device’s configurable parameters and public interfaces to those parameters.

Every type of configurable device has its own unique EDS. It is a simple text file that allows product-specific information to be made available to third-party vendors.

This makes updating of configuration tools easier without having to constantly revise the configuration software tool.

Beginning with the following revisions, EDS files are required for RSNetworx for Devicenet and ControlNet, RSLinx, RSLogix5, and RSLogix 5000 software to recognize a device:

RSNetworx Version 2.21 RSLinx Version 1.10.176 RSLogix5 Version 4.0 RSLogix5000 Version 5.12

Updating EDS File

Most EDS files are installed with RSLinx, RSNetworx, and other RSI software as long as you enable the option during installation.

There are instances where you will need to acquire and register EDS files on your own even after all software is installed.

• If you go online with RSNetworx and it shows a device with a "?" mark icon, a globe, or a message that says the device is unrecognized, this means the EDS file for that device does not exist on your PC.

• If RSLinx can see a processor but going online, uploading or downloading is not possible.

With ControlLogix modules the backplane does not show after expanding the tree or ControlLogix modules in the backplane show up as a yellow question mark without a red X sign.

An EDS file is also required if a bridge module such as a 1756-CNB or DNB does not show the "+" sign to expand the tree to show its network.

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58 Electronic Data Sheet (EDS) Files

ATTENTION

To acquire EDS files for Rockwell Automation and Allen-Bradley devices, go to Tools & Resources EDS Files at www.ab.com/networks/eds

. It allows you

to search for devices by the type of network and their catalog number.

•Make sure to match the major firmware revision of the device as each major firmware revision is associated with a specific EDS file.

•Download the EDS file and place it in any folder, except the /Program Files/Rockwell Software/RSCommon/EDS folder where your Rockwell Automation software is installed.

•Register EDS files with RSNetworx by selecting Tools EDS Wizard.

•Select Register an EDS File, then click the Browse button on the Next page to find your file.

EDS Installation

You can register EDS files with the EDS Hardware Installation tool.

1. In Windows, go to Rockwell Software → RSLinx Tools → EDS

Hardware Installation Tool.

2. Click Add to register an EDS file.

When an EDS file is registered, a copy of the file is made and placed in the /RSCommon/EDS folder, where your Rockwell Automation software is installed and your Windows registry is updated. Once the registration is complete you can move, copy, or delete the original files.

Only one EDS file is required to support both the Series A and Series B modules. The module ID for the Series A and B is identical because there is no change in software functionality.

The Series B hardware jumper determines how the module data reacts to an open circuit condition.

Publication 1794-6.5.12 - September 2011

The Series A and B EDS file can be downloaded from

www.ab.com/networks/eds

The EDS file is installed using the RSLinx Tools EDS Hardware Installation Tool.

Appendix

Program Your Module with PLC Family Processors

Overview

Enter Block Transfer Instructions

This Appendix serves as a reference to users of the PLC-* Family Processors to program their modules.

To initiate communication between the Thermocouple, RTD, and Millivolt modules and your PLC processor, you must enter block transfer instructions into your ladder logic program. Use this chapter to enter the necessary block transfer instructions into your ladder logic program.

The Thermocouple, RTD, and Millivolt modules communicate with the PLC processor through bidirectional block transfers. This is the sequential operation of both read and write block transfer instructions.

Before you configure the module, you need to enter block transfer instructions into your ladder logic. The following example programs illustrate the minimum programming required for communication to take place between the module and a PLC processor. These programs can be modified to suit your application requirements.

A configuration block transfer write (BTW) is initiated when the frequency module is first powered up, and subsequently only when the programmer wants to enable or disable features of the module. The configuration BTW sets the bits which enable the programmable features of the module, such as scalars and alarm values, and so on. Block transfer reads are performed to retrieve information from the module.

Block transfer read (BTR) programming transmits status and data from the module to the processor data table. The processor user program initiates the request to transfer data from the module to the processor. The transferred words contain module status, channel status and input data from the module.

Your program should monitor status bits, block transfer read and block transfer write activity.

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60 Program Your Module with PLC Family Processors

IMPORTANT

PLC-2 Family Processor

The 1794 Thermocouple, RTD, and Millivolt modules are not recommended for use with PLC-2 family programmable controllers due to the number of digits needed for high resolution.

PLC-3 Family Processor

Block transfer instructions with the PLC-3 processor use a control file and a data file. The block transfer control file contains the data table section for module location, the address of the block transfer data file and other related data. The block transfer data file stores data that you want transferred to the module (when programming a BTW) or from the module (when programming a BTR).

The Thermocouple, RTD, and Millivolt modules function with reduced performance in PLC-2 systems. Because the modules do not support BCD and the PLC-2 processor is limited to values of 4095 (12 bit binary), many values returned in the BTR file may not provide meaningful data to the PLC-2 processor.

The programming terminal prompts you to create a control file when a block transfer instruction is being programmed. The same block transfer control file is used for both the read and write instructions for your module. A different block transfer control file is required for every module.

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Program Your Module with PLC Family Processors 61

IRT8 BTR

Error Bit

B17:0

BTR BLOCK TRANSFER READ

Rack Group Slot

Data File

3 2 1

N18:101

Length

Control

B17:0

BTW

BLOCK TRANSFER WRITE Rack

Group Slot

Data

3 2 1

N18:1

Length

Control

B17:0

Rung M:0 The IRT8 module is located in rack 3, I/O group 2, slot 1. The control file is a 10 word file starting at B17:0 that is shared by the BTR/BTW. The data obtained by the PLC3 processor is placed in memory starting at location N18:101, and with the default length of 0, is 11 words long.

IRT8 BTR

Done Bit

IRT8 BTR/BTW Control Block

The IRT8 module is located in rack 3, I/O group 2, slot 1. The control file is a 10 word file starting at B17:0 that is shared by the BTR/BTW. The data sent by the PLC-3 processor to the IRT8 module is from PLC memory starting at N18:1, and with the default length of 0, is 4 words long.

IRT8 BTR

Error Bit

B17:0

IRT8 BTW

Done Bit

IRT8 BTR/BTW Control Block

B17:0

IRT8 BTW

Error Bit

IRT8 BTW

Error Bit

PLC-3 Processor Program Example

45566

PLC-5 Family Processor

Block transfer instructions with the PLC-5 processor use a control file and a data file. The block transfer control file contains the data table section for module location, the address of the block transfer data file and other related data. The block transfer data file stores data that you want transferred to the module (when programming a BTW) or from the module (when programming a BTR).

The programming terminal prompts you to create a control file when a block transfer instruction is being programmed. A different block transfer control file is used for the read and write instructions for your module.

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62 Program Your Module with PLC Family Processors

BTR BLOCK TRANSFER READ

Rack Group

Slot Control

2 1

N22:200

Data File Length

Continuous

N22:101

ENBLOCK TRANSFER WRITE Rack Group Slot Control

2 1

N22:205

Data File Length Continuous

N22:1

N22:200

N22:205

Rung 2:0 The IRT8 module is located in rack 2, I/O group 2, slot 1. The integer control file starts at N22:200, is 5 words long and is compatible with all PLC-5 family members. The data obtained by the PLC-5 processor from the IRT8 module is placed in memory starting at N22:101, and with the default length of 0, is 11 words long. The length can be any number

N22:205

Rung 2:1 The IRT8 module is located in rack 2, group 2, slot 1. The integer control file starts

at N22:205, is a 5 words long and is compatible will all PLC-5 family members. The data sent by the PLC-5 processor to the IRT8 module starts at N22:1, and with the default length of 0, is 4 words long. Valid BTW lengths: 0, 1, 2, 3, and 4. In enhanced PLC-5 processors

1, the block transfer data type may be used as a control file.

IRT8 BTR

Enable Bit

IRT8 BTW Enable Bit

IRT8 BTR Control File

IRT8 BTR

Enable Bit

IRT8 BTW Enable Bit

IRT8 BTW Control File

PLC-5 Processor Program Example

BTW

À Enhanced PLC-5 processors include: PLC-5/11, -5/20, -5/3x, -5/4x, and -5/6x.

45567

PLC-5/250 Family Processor

Block transfer instructions with the PLC-5/250 processor use a control file and a data file. The block transfer control file contains the data table section for module location, the address of the block transfer data file and other related data. The block transfer data file stores data that you want transferred to the module (when programming a BTW) or from the module (when programming a BTR).

The programming terminal automatically selects the control file based on rack, group and module, and whether it is a read or write. A different block transfer control file is used for the read and write instructions for your module. A different block transfer control file is required for every module.

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Program Your Module with PLC Family Processors 63

BTR

BLOCK TRANSFER READ Rack Group Slot Control Block

1 0

BR141:0

Data File BT Length

Continuous

2BTD5:101

BTW

BLOCK TRANSFER WRITE Rack Group Slot Control Block

1 0

BW141:0

Data File BT Length Continuous

2BTD5:1

BR141:0

BW141:0

Rung 1STEPO:1

The IRT8 module is located in rack 14, I/O group 1, slot 0. The data obtained by the PLC-5/250 processor from the IRT8 module is placed in the data table starting at 2BTD5:101, and with the default length of 0, is 11 words long. The length can be any number between 0 and 11.

BW141:0

Rung 1STEPO:1

The IRT8 module is located in rack 14, I/O group 1, slot 0. The data sent to the IRT8 module from the PLC-5/250 processor is from the data table starting at 2BTD5:1, and with a default length of 0, is 4 words long. Valid BTW lengths: 0, 1, 2, 3, and 4.

IRT8 BTR

Enable Bit

IRT8 BTW Enable Bit

IRT8 BTR Control File

IRT8 BTR

Enable Bit

IRT8 BTW Enable Bit

IRT8 BTW Control File

BT Timeout 4

BT Timeout

PLC-5/250 Processor Program Example

45568

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64 Program Your Module with PLC Family Processors

Notes:

Publication 1794-6.5.12 - September 2011

Safety Approvals

WARNING

Appendix

European Hazardous Location Approval

The 1794-IRT8, 1794-IRT8K, and 1794-IRT8XT modules are European Hazardous Location approved.

European Zone 2 Certification (The following applies when the product bears the Ex or EEx Marking)

This equipment is intended for use in potentially explosive atmospheres as defined by European Union Directive 94/9/EC and has been found to comply with the Essential Health and Safety Requirements relating to the design and construction of Category 3 equipment intended for use in potentially explosive atmospheres, given in Annex II to this Directive.

Compliance with the Essential Health and Safety Requirements has been assured by compliance with EN 60079-15 and EN 60079-0.

Observe the following additional Zone 2 certification requirements.

• This equipment is not resistant to sunlight or other sources of UV radiation.

• This equipment must be installed in an enclosure providing at least IP54 protection when applied in Zone 2 environments.

• This equipment shall be used within its specified ratings defined by Allen-Bradley.

• Provision shall be made to prevent the rated voltage from being exceeded by transient disturbances of more than 40% when applied in Zone 2 environments.

• Secure any external connections that mate to this equipment by using screws, sliding latches, threaded connectors, or other means provided with this product.

• Do not disconnect equipment unless power has been removed or the area is known to be nonhazardous.

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66 Safety Approvals

WARNING

AVERTISSEMENT

North American Hazardous Location Approval

The following information applies when operating this equipment in hazardous locations.

Products marked “CL I, DIV 2, GP A, B, C, D” are suitable for use in Class I Division 2 Groups A, B, C, D, hazardous locations and nonhazardous locations only. Each product is supplied with markings on the rating nameplate indicating the hazardous location temperature code. When combining products within a system, the most adverse temperature code (lowest “T” number) may be used to help determine the overall temperature code of the system. Combinations of equipment in your system are subject to investigation by the local Authority Having Jurisdiction at the time of installation.

EXPLOSION HAZARD

•Do not disconnect equipment unless power has been removed or the area is known to be nonhazardous.

•Do not disconnect connections to this equipment unless power has been removed or the area is known to be nonhazardous. Secure any external connections that mate to this equipment by using screws, sliding latches, threaded connectors, or other means provided with this product.

•Substitution of components may impair suitability for Class I, Division 2.

•If this product contains batteries, they must only be changed in an area known to be nonhazardous.

The 1794-IRT8, 1794-IRT8K, and 1794-IRT8XT modules are North American Hazardous Location approved.

Informations sur l’utilisation de cet équipement en environnements dangereux.

Les produits marqués “CL I, DIV 2, GP A, B, C, D” ne conviennent qu’à une utilisation en environnements de Classe I Division 2 Groupes A, B, C, D dangereux et non dangereux. Chaque produit est livré avec des marquages sur sa plaque d’identification qui indiquent le code de température pour les environnements dangereux. Lorsque plusieurs produits sont combinés dans un système, le code de température le plus défavorable (code de température le plus faible) peut être utilisé pour déterminer le code de température global du système. Les combinaisons d’équipements dans le système sont sujettes à inspection par les autorités locales qualifiées au moment de l’installation.

•Couper le courant ou s’assurer que l’environnement est classé non dangereux avant de débrancher l'équipement.

•Couper le courant ou s'assurer que l’environnement est classé non dangereux avant de débrancher les connecteurs. Fixer tous lesconnecteurs externes reliés à cet équipement à l'aide de vis, loquets coulissants, connecteurs filetés ou autres moyens fournis avec ce produit.

•La substitution de composants peut rendre cet équipement inadapté à une utilisation en environnement de Classe I, Division 2.

•S’assurer que l’environnement est classé non dangereux avant de changer les piles.

Publication 1794-6.5.12 - September 2011

Index

Numerics

1756-CNB 57 1756-ENBT 21 1794-ACN15 3 1794-ACNR15 3 1794-ACNR15K 3 1794-ADN 3 1794-AENT 3, 22 1794-APB 3 1794-APBDPV1 3 1794-ASB 3 1794-CJC2 2, 54 1794-IRT8 ix, 2, 4, 8, 21, 38, 71, 72 1794-IRT8K ix, 2, 71, 72 1794-IRT8XT ix, 2, 71, 72 1794-TB3G 7, 14, 15, 16, 18, 38, 39, 53, 54 1794-TB3GK 15, 16, 18, 53, 54 1794-TB3GS 7, 14, 15, 16, 18, 38, 39, 53, 54

accuracy 65 adapter 1, 2, 12, 14 alignment

bar 15 groove 15

Allen-Bradley 40, 71 analog signals 3

backplane 7, 15 base unit 15 Belden 8761 55 bipolar 27 bits

CJC alarm 8 CJC fault 33, 52 data format 28, 34 diagnostic 33, 52 EDT 34 EDT command 38 EDT data 38 fault alarm 33, 52 fault mode 34 input type 37 input types 28 overrange alarm 32 reference junction 28 sensor mode 28, 35, 37 sensor type 28, 36 underrange alarm 32

block transfer read (BTR) 31,52,59, 60, 61, 62 block transfer write (BTW) 30, 31, 40, 59, 60, 61, 62

calibration

CJC 44 cold junction 43, 48, 49 current source 47 EDT command 44, 45 environment 39 equipment 39 gain 44, 46 general 44 manual 40 offset 44, 45, 46 periodic 39 power supply 40, 45 preparation 40 procedure 39 read words 42 setup 41 temperature 39, 40 tools 39, 40 types of 39 using resistors 41 write words 42

cap plug 15 CE Low Voltage Directive 56 certification

CE 56 C-Tick 56 c-UL-us 56 European Zone 2 71

chassis 7, 16, 18, 42 CJC

disconnecting 18, 19 fault 52 sensors 36, 37 alarm bit 8

cold junction

calibration 49 compensation 18, 25, 28, 43 compensators 2, 17

commands

EDT 44

common mode 8 communication

module and adapter 3

CompactLogix 21 compensation

2-wire 25 2-wire with Loop 25

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68 Index

channel loop 29 CJC 30 differential 25 external 25, 36, 37 internal 25, 36, 37

conductors 55 configuration

data format selection 28 fault mode 29 input filter 27 input range 27 input types 28 options 27 parameters 24 reference junction 28 RTD offset 29 sensor mode 28 sensor type 28

connecting wiring 41 connector

current 54 female 10 male 10

controller 21 ControlLogix 21, 57 ControlNet 4, 8, 21 C-Tick 56 current draw 8 current source

calibration 47

daisychain 9, 17 data format

bipolar 28 unipolar 28

data table 27 detection

over-range 2 under-range 2 wire-off 2

diagnostics 51, 52 digital module 9 dimensions 54 DIN rail 2, 11 dissipation

power 54

drilling

dimension 13 points 12

EDT

command 32, 45, 46, 47, 48 data response 34 response 46, 48, 49

EFT/B immunity 56 Electronic Data Sheet (EDS) 58 emissions 55 EN 60079-0 71 EN 60079-15 71 enclosure 7

type rating 55

equipment 40 ESD immunity 55 Ethernet

adapter 21

EtherNet/IP 4, 8 explosion hazard 72

fault

alarm 33, 52 channel 32 detection 27 EEPROM 52 mode 29 RAM 52

filter

single pole 28

firmware 8 FLEX I/O 39

components 1 millivolt 7, 27, 53 RTD 7, 27, 53 system 12, 39, 40 thermocouple 7, 27, 53

FLEX system 1, 2 FlexBus 3, 10, 11, 12, 15 frequency input

indicators 51

gain 39, 40, 46

hazardous location

European 71 North American 72

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Index 69

humidity 39

indicator 54 input

channels 40 default 28 designators 5 filter 24, 25 range 30 resistive 2 type 36, 37

installation

connecting wiring 10 hazardous location 15 instructions 7 mounting 10 requirements 7 terminal base 12

IP54 protection 71 isolation mode 8

keyswitch 7, 14, 15, 54

ladder logic 40, 59 latching mechanism 15 Logix system 4 loop compensation 37 low pass 28

male connector 10 manual

conventions xii purpose ix related x

manual calibration 40 message

fault 40

millivolt 28, 39, 60

calibration 41 wiring 18, 20

module

label 4 status 52

mounting

kit 13

wall or panel 12

MSG instructions 4 mV source 2, 28

offset calibration 45 ohmmeter 17 open input 54 open sensor 52 overrange 29

PLC processors

control file 62, 60 data file 62, 60 PLC-2 60 PLC-2 system 60 PLC 5-250 21, 61, 62 PLC 5 controller 21

power 40

connections 8 external DC 54 operational 7

precision millivolt 45, 46, 47 processor 27, 40 programming 59 Protected Extra Low Voltage (PELV) 56 publications

related x

read programming 30 read words

decimal 42 octal 42 overrange bits 33 underrange bits 33

recalibration 39 reference junction 34, 37, 42

default temperature 28 selection 36

related documentation x relative humidity 55 Requested Packet Interval (RPI) 23 resistance 28, 35, 36 resolution curve

type B 24, 65 type E 24, 66 type J 24, 66

Publication 1794-6.5.12 - September 2011

70 Index

type K 24, 67 type N 24, 69 type R 24, 68 type S 24, 68 type T 24, 69 type TXK/XKL(L) 24, 70

RF immunity 56 RSLinx 57, 58 RSLogix 5000 software 4, 8, 21, 57 RSLogix 5 software 57 RSNetworx 57, 58 RTD

analog input mapping 31 2-wire 18, 36, 37 3-wire 18, 25, 36, 37 3-wire connection 17 4-wire 18, 25, 36, 37, 41 4-wire connection 17 disconnecting 19 fault mode 29 isolators 19, 30 loop channel compensation 44 mode 29 offset 29, 32, 37, 42 wire pairs 17

Safety Extra Low Voltage (SELV) 56 sensor

CJC 36 mode 24, 25, 32, 28, 35, 42 RTD Type 29 RTD type 36 thermocouple type 29, 36 type 24, 32, 28, 29, 35, 36

series A 7, 8, 38 series B 7, 8, 38, 43 shock 55 signal

analog to binary 3 conductors 55 wiring 16

SLC 21 specification

accuracy vs. filter cutoff 53 cold junction compensation 54 common mode input range 53 common mode rejection 53 conducted RF immunity 56 data format 53 DIN rail 11

emissions 55 enclosure type rating 55 ESD immunity 55 general 53 indicators 54 isolation voltage 54 module location 53 nominal input voltage 53 number of inputs 53 open circuit 54 overall drift with temperature 54 overvoltage capability 54 radiated RF immunity 56 relative humidity 55 resolution 53 supply voltage 54 supported RTD 53 supported thermocouple 53 system throughput 54 temperature 55 vibration 55 wire size 55

status indicator

diagnostic 43 fault 51 power 52

supply voltage 54 surge transient immunity 56

T4 55 T4A 55 temperature

ambient 28 code 55 non-operating 55 operating 55

terminal base 1, 2, 7, 10, 13, 55

installation 12 mounting 10 wiring 8

thermal dissipation 54 thermocouple 2, 24, 25, 28, 30, 36, 39, 42, 60

mode 8 resolution curves 65 wiring 18

tools

precision resistors 40 precision voltage source 40 calibration 40 interconnect cable 40

Publication 1794-6.5.12 - September 2011

Index 71

troubleshoot 51

unipolar 27

vibration 55 voltage

supply 54

wire type 55 wire pairs

3-wire RTD 17 4-wire RTD 17

connecting 17

wiring

category 55 combination 9 connections 18, 41 terminal base 8, 41

write words

data format 42 filter time constants 34 input type 36 RTD Type 35 sensor mode 37 sensor type 36

Zone 2 71

Publication 1794-6.5.12 - September 2011

72 Index

Notes:

Publication 1794-6.5.12 - September 2011

Index 73

Publication 1794-6.5.12 - September 2011

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Publication 1794-6.5.12 - April 2011 74

Rockwell Automation 1794-IRT8XT User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important User Information

Summary of Changes

New and Updated Information

Table of Contents

Preface

Who Should Use This Manual

Purpose of the Manual

About the Vocabulary

Related Documentation

Common Techniques Used in this Manual

Overview

The FLEX System

Types of Modules

What the FLEX I/O Input Module Does

The FLEX I/O Module in a Logix Control System

Physical Features of Your Module

Chapter Summary

Overview

Before You Install Your Module

Series A and Series B

Power Requirements

Install the Module

Mount on a DIN Rail

Mount on a Panel or Wall

Mount the FLEX I/O Module on the Terminal Base Unit

Wiring Information

Connect Wiring to the FLEX I/O Module

Identify RTD Wire Pairs

Chapter Summary

Overview

Add and Configure the FLEX I/O Module

Chapter Summary

Overview

Configure Your Input Module

Options that Affect All Channels

Options that Affect Each Group of Four Inputs

Sensor Types

Read Data From the Module

Map Data for the Module

Thermocouple and RTD Input Module Image Table Mapping

Block Transfer Read and Write

Bit/Word Descriptions for the Input Module Block Transfer Read Words

Using Series A Functionality in a Series B Module

Chapter Summary

Overview

When and How to Calibrate Your FLEX I/O Module

Tools and Equipment

Calibrate Your Input Module

Calibration Setup

Wiring Connections for Calibrating the Thermocouple and RTD Input Module

Read and Write Words for Calibration

EDT Calibration Command and Command Data Summary

Offset Calibration

Gain Calibration

Current Source Calibration

Cold Junction Calibration

Channel Loop Compensation Calibration

Chapter Summary

Overview

Module Indicators

Chapter Summary

Overview

General Specifications

Environmental Specifications

Certifications

Overview

Updating EDS File

EDS Installation

Overview

Enter Block Transfer Instructions

PLC-2 Family Processor

PLC-3 Family Processor

PLC-5 Family Processor

PLC-5/250 Family Processor

European Hazardous Location Approval

North American Hazardous Location Approval