Rockwell Automation Allen-Bradley FLEX Ex 1797-IRT8 User manual

FLEX Ex
Thermocouple/
RTD/mV Input
Module
Cat. No. 1797-IRT8
User Manual

Important User Information
Because of the variety of uses for the products described in this
publication, those responsible for the application and use of this
control equipment must satisfy themselves that all necessary steps
have been taken to assure that each application and use meets all
performance and safety requirements, including any applicable laws,
regulations, codes and standards.
The illustrations, charts, sample programs and layout examples shown
in this guide are intended solely for purposes of example. Since there
are many variables and requirements associated with any particular
installation, Allen-Bradley does not assume responsibility or liability
(to include intellectual property liability) for actual use based upon
the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the
Application, Installation and Maintenance of Solid-State Control
(available from your local Allen-Bradley office), describes some
important differences between solid-state equipment and
electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in whole
or part, without written permission of Rockwell Automation, is
prohibited.
Throughout this manual we use notes to make you aware of safety
considerations:
Attention statements help you to:
•identify a hazard
•avoid a hazard
•recognize the consequences
Allen-Bradley, FLEX Ex, FLEX I/O, and ControlNet Ex are trademarks of Rockwell Automation
ControlNet is a trademark of ControlNet International
ATTENTION
!
Identifies information about practices or
circumstances that can lead to personal injury or
death, property damage or economic loss
IMPORTANT Identifies information that is critical for successful
application and understanding of the product.

3Publication 1797-6.5.2 - February 2001
Preface
Using This Manual
Why Read this Manual This manual shows you how to use your FLEX Exthermocouple/
RTD/mV module with the ControlNet Exproducts and ControlNet
network. The manual helps you install, program, and troubleshoot
your module.
Who Should Read this
Manual You must be able to program and operate a ControlNet Ex product
and ControlNetnetwork to make efficient use of a FLEX Ex module.
About the Vocabulary In this manual, we refer to the:
•1797-IRT8 as the “input module”. or “module.”
What this Manual
Contains The following chart lists each chapter with its corresponding title and
a brief overview of the topics covered in that chapter.
Chapter Title Contents
1About the FLEX Ex Analog Modules Describes features, capabilities,
and hardware components
2Understanding Configurable FLEX Ex
thermocouple/RTD/mV Input Module
Features
Describes configurable features of
the input module
3How to InstallYour Thermocouple/
RTD/mV Module How to install and wire the module
4Input, Output and Configuration Files
forthehermocouple/RTD/mVModule
on the ControlNet network
Describes communication over the
I/O backplane between the module
and the adapter, and how data is
mapped into the imagetable
5Calibrating Your Module Lists the tools needed, and the
methods used to calibrate the
module
6Applying FLEX Ex Analog Modules Learn how to evaluate, define,
select, match and optimize your
system.
7Troubleshooting Your Module How to use the indicators to
troubleshoot your module
Appendix Title Contents
ASpecifications Outlines module specifications and
accuracy
BProgramming the FLEX Ex Analog
Module using RIO Shows ladder diagramming for programming.

Publication 1797-6.5.2 - February 2001
Using This Manual 4
For Additional
Information For additional information on FLEX Ex systems and modules, refer to
the following documents,
In Summary This preface gave you information on how to use this manual
efficiently. The next chapter introduces you to the 1797-IRT8
Thermocouple/RTD/mV Input module.
Catalog
Number Description Publications
Installation
Instructions User Manual
1797 Series FLEX Ex Product Data 1797-2.1
(Product data)
1797 Series FLEX Ex System Overview 1797-2.2
(System
overview)
1797 Series ControlNet Ex System Cable Guide 1797-6.2.1
(Systemguide)
1797 Series FLEX Ex System Certification
Reference Manual 1797-6.2.6
1797-TB3 FLEX Ex Terminal Base 1797-5.1
1797-TB3S FLEX Ex Spring Clamp Terminal Base 1797-5.2
1797-OE8 FLEX Ex 8 Output Analog Module 1797-5.3 1797-6.5.1
1797-IRT8 FLEX Ex RTD/Thermocouple/mV
Module 1797-5.4 1797-6.5.2
1797-IE8 FLEX Ex 8 Input Analog Module 1797-5.5 1797-6.5.1
1797-IE8NF FLEX Ex 8 Input Analog Module w/
Noise Filter 1797-5.31 1797-6.5.1
1797-OB4D 4 Output Module 1797-5.6
1797-IBN16 FLEX Ex NAMUR Digital Input Module 1797-5.7
1797-IJ2 2 Frequency Input Module 1797-5.9 1797-6.5.4
1797-PS2N
1797-PS2E FLEX Ex Power Supplies 1797-5.12
1797-ACNR15 ControlNetEx Adapter 1797-5.14 1797-6.2.1
1797-RPA, -RPFM Fiber Hub 1797-5.15 1797-6.2.1
1797-BIC Bus Isolator 1797-5.13
1797-TPR,
- TPRS, -TPYR,
-TPYS
FLEX Ex Taps 1797-5.18 1797-6.2.1
1797-CE1S,
-CE3S, -CEFTN,
-CEFTE
Interconnect Cables 1797-5.20
1797-EXMK Marker Kit 1797-5.23
1797 FLEX Ex System Certification 1797-6.5.6

iPublication 1797-6.5.2 - February 2001
Table of Contents
Important User Information. . . . . . . . . . . . . . . . . . . . . . . . . . 2
Preface
Using This Manual
Why Read this Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Who Should Read this Manual. . . . . . . . . . . . . . . . . . . . . . . . 3
About the Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
What this Manual Contains . . . . . . . . . . . . . . . . . . . . . . . . . . 3
For Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . 4
In Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table of Contents
Chapter 1
About the FLEX Ex Thermocouple/
RTD/mV Input Module
What this Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . 1-1
What the FLEX Ex Thermocouple/RTD/mV Modules Do. . . 1-1
How FLEX Ex Thermocouple/RTD/mV Modules
Communicate with Programmable Controllers . . . . . . . . . . 1-2
Events following Power-Up . . . . . . . . . . . . . . . . . . . . . 1-2
Features of Your Module. . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Using Alarms on the 1797-IRT8 Module . . . . . . . . . . . . . . . 1-3
Data Format Alarm Example. . . . . . . . . . . . . . . . . . . . . 1-4
Overrange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Underrange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Open Wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Cold Junction Compensation Alarm . . . . . . . . . . . . . . . . . . . . 1-4
Data Formats and Fault Modes . . . . . . . . . . . . . . . . . . . 1-5
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Chapter 2
Understanding Configurable FLEX
Ex Thermocouple/RTD/mV Input
Module Features
What this Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Setting a FLEX Ex Thermocouple/RTD Module’s Operating
Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Input Type Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Sensor Type Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Input Filter Cutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Sensor Mode Select . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Preset Temperature Select . . . . . . . . . . . . . . . . . . . . . . 2-5
RTD Loop Resistance Offset Select . . . . . . . . . . . . . . . . 2-6
Fault Mode Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Using Module Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Overrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Underrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Publication 1797-6.5.2 - February 2001
Table of Contents ii
Chapter 3
How to Install Your FLEX Ex
Thermocouple/RTD/mV Module
What this Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Before You Install Your Analog Module. . . . . . . . . . . . . . . 3-1
Compliance to European Union Directives. . . . . . . . . . . . . 3-2
EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Ex Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Installation in Zone 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Electrostatic Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Removal and Insertion
Under Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Installing the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Mounting on a DIN Rail . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Panel/Wall Mounting . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Mounting the 1797-IRT8 Module on the Terminal
Base Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Wiring the Terminal Base Units . . . . . . . . . . . . . . . . . . . . . 3-9
Connecting Wiring to the
FLEX Ex Thermocouple/RTD/mV Module . . . . . . . . . . . . . 3-10
Inputs/Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Wiring connections for the 1797-IRT8 Module. . . . . . . . 3-11
Grounding the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Chapter 4
Input, Status, Output and
Configuration Files for the
Thermocouple/RTD/mVModuleon
the ControlNet Network
What this Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Using Programming Software in Your FLEX Ex Application. 4-2
About the ControlNet Ex Adapter. . . . . . . . . . . . . . . . . . . . 4-2
Communication Over the FLEX Ex Backplane . . . . . . . . . . 4-2
Scheduled Data-Transfer . . . . . . . . . . . . . . . . . . . . . . . 4-3
Unscheduled Data-Transfer . . . . . . . . . . . . . . . . . . . . . 4-3
Module I/O Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
I/O Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Adapter Status Word . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Fault State Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Device Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Communication Fault Behavior. . . . . . . . . . . . . . . . . . . 4-6
Idle State Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Input Data Behavior upon Module Removal . . . . . . . . . 4-7
Thermocouple/RTD/mV Input Module (1797-IRT8) Image
Table Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Bit/Word Description for the Thermocouple/RTD/mV Input
Module (1797-IRT8) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Publication 1797-6.5.2 - February 2001
Table of Contents iii
Chapter 5
Calibrating Your Module
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . 5-1
When and How to Calibrate Your FLEX Ex
Thermocouple/RTD/mV Input Module. . . . . . . . . . . . . . . . 5-1
Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Calibration Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Chapter 6
Applying FLEX Ex Thermocouple/
RTD/mV Input Modules
What this Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Evaluate the Application . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Define the Area Classification . . . . . . . . . . . . . . . . . . . . . . 6-2
Decide Classification Method . . . . . . . . . . . . . . . . . . . . 6-2
Determine Hazard . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Determine Temperature Rating. . . . . . . . . . . . . . . . . . . 6-2
Select Protection Method(s). . . . . . . . . . . . . . . . . . . . . . . . 6-3
Match Field Devices and I/O Modules . . . . . . . . . . . . . . . . 6-3
1797-IRT8 and Thermocouple and RTD Functional and IS
Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Using the Entity Method. . . . . . . . . . . . . . . . . . . . . . . . 6-5
Entity Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
General Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Interconnect Wiring 6-7
I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Optimize Power Distribution . . . . . . . . . . . . . . . . . . . . . . . 6-8
Assigning Power Supplies . . . . . . . . . . . . . . . . . . . . . . 6-8
Power Supply Considerations. . . . . . . . . . . . . . . . . . . . 6-9
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
Chapter 7
Troubleshooting the FLEX Ex
Thermocouple/RTD/mV Input
Module
What this Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Appendix A
Specifications
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
CE/CENELEC I/O Entity Parameters . . . . . . . . . . . . . . . . . . A-2
UL, C-UL I/O Entity Parameters . . . . . . . . . . . . . . . . . . . . . A-3
Table 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Wiring Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Table 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
FM I/O Entity Parameters . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Wiring Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Table 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
Table 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Publication 1797-6.5.2 - February 2001
Table of Contents iv
Appendix B
Programming the FLEX Ex I/O
Modules
Using RIO
What this Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . B-1
Enter Block Transfer
Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Using the PLC-5C Processor. . . . . . . . . . . . . . . . . . . . . . . . B-2
Index
Back Cover

1Publication 1797-6.5.2 - February 2001
Chapter 1
About the FLEX Ex Thermocouple/RTD/mV
Input Module
What this Chapter
Contains Read this chapter to familiarize yourself with the 1797-IRT8 input
module.
What the FLEX Ex
Thermocouple/RTD/mV
Modules Do
The 1797-IRT8 module accepts up to 8 thermocouple, RTD or mV
inputs. The inputs are nonisolated and are selected with analog
multiplexers which have a common-mode input range of -0.5 to +3.6
volts. The inputs will accept a millivolt or resistive input. Default input
spans are –40.00mV to +100.00mV or 0.00 to 500.00 ohms. Fault
Indicators are located on the field side.
No switches or jumpers are used on the thermocouple/RTD/mV input
module. The Inputs have both fixed hardware filters and selectable
firmware digital filters.
This module offers:
•local microprocessor intelligence for advanced features
•full functionality without switches or jumpers
•multiple data ranges that can be independently programmed in
channel groups
•lead breakage detection
•overrange/underrange alarms
as well as a host of other module features.
For information on: See page:
What the FLEX Ex Thermocouple/
RTD/mV Modules Do 1-1
How FLEX Ex Thermocouple/RTD/mV
Modules Communicate with
Programmable Controllers
1-2
Features of Your Module 1-2
Chapter Summary 1-5

Publication 1797-6.5.2 - February 2001
1-2 About the FLEX Ex Thermocouple/RTD/mV Input Module
How FLEX Ex
Thermocouple/RTD/mV
Modules
Communicate with
Programmable
Controllers
FLEX Ex thermocouple/RTD/mV modules provide best utility when
used with ControlNet Ex products on the ControlNet network. Data
connections are established between the I/O module and an
Allen-Bradley programmable controller to transfer information
between the two at a scheduled rate.
Input module information is then automatically made available in the
PLC data table.
When the data connection is established, configuration information
for the module is automatically transferred to it via the network.
Events following Power-Up
You must apply intrinsically safe +/-V power to your FLEX Ex I/O
modules. The following sequence of events occurs after power has
initially been applied to your module:
1. The module begins an interal diagnostic check. The channel 0 LED
indicator turns ON to indicate the check has begun. The indicator
turns OFF when the check is finished.
2. After the diagnostic check, module configuration information,
selected by the user and downloaded over the network, is applied
by the module.
For more information on configuration options, see Chapter 2.
3. Following the module configuration download for the 1797-IRT8
module, the module begins producing runtime data for the PLC.
4. If any diagnostics or alarms are generated during normal module
operation, the data is returned to the PLC.
Features of Your Module The module label identifies the keyswitch position, wiring and
module type. Use the removable label to note individual designations
per your application.

Publication 1797-6.5.2 - February 2001
About the FLEX Ex Thermocouple/RTD/mV Input Module 1-3
Indicators
Indicators are provided to identify input or output fault conditions,
and to show when power is applied to the module.
Using Alarms on the
1797-IRT8 Module The 1797-IRT8 FLEX Ex module is capable of generating four alarms:
•Underrange
•Overrange
•Fault (open wire)
•Cold junction compensation Fault
These alarm conditions are described in general terms and as they
relate to bits on the FLEX Ex I/O module on the following pages. The
graphic below shows at what values these alarms are generated for
Data Format 4.
Ex
1797-IRT8
PWR
40070
1797-IRT8 Module Type
Removable Label
Keyswitch Position
Indicator (#2)
Power On Indicator
Input Designators

Publication 1797-6.5.2 - February 2001
1-4 About the FLEX Ex Thermocouple/RTD/mV Input Module
Data Format Alarm Example
In this example, the normal active data range is 4-20mA. The alarms
are generated in three overlapping bands.
Overrange
If the input is greater than the maximum temperature of the
thermocouple or RTD range, millivolt (+100mV), or resistance (500W)
the overrange bit for that channel will be set.
Underrange
If the input is less than the minimum temperature of the thermocouple
or RTD range, millivolt (-40mV), or resistance (0W) the underrange bit
for that channel will be set.
Open Wire
Individual channel fault alarm for broken wire. If a broken wire/
detached lead is detected, the data value is forced to maximum. In
RTD/W mode, input levels above 540W will set this bit; in
thermocouple/mV mode, input levels above 210mV will set this bit.
Cold Junction Compensation Alarm
Broken or detached lead or shorted lead detection is included for
CJCs. This detection is only available when the input type selected is
thermocouple and sensor mode is set to CJC compensation.
When either CJC fails its fault is reported. Both CJCs ae normally used
in compensation calculations. If one CJC fails, calculations use the
remaining good device. If both fail, calculations use the last good
value.
normal signal range overrange
CJC fault
underrange
Minumum
Value for
Sensor
Type
Maximum
Value for
Sensor
Type
Maximum
Measureable
Value
PHYSICAL INPUT SIGNAL RANGE
Channel Data
Forced to
Maximum for Type
CJC fault
open wire fault

Publication 1797-6.5.2 - February 2001
About the FLEX Ex Thermocouple/RTD/mV Input Module 1-5
Data Formats and Fault Modes
The tables below shows the bit settings for the data formats and fault
modes for your FLEX Ex thermocouple/RTD/mV module.
Data Formats
Fault Mode
Chapter Summary In this chapter, we told you about the FLEX Ex system and the
thermocouple/RTD/mV module, and how it communicates with
programmable controllers.
Bit 11 10 09 08 Data type for channels 0 thru 7
0000oC (see note)
0001oF (see note)
0010oK (see note)
0 0 1 1 -32767to +32767
0 1 0 0 0to 65535
0101 thru 1111 not used
Note: Module defaults to -4000 to 10,000 in millivolt mode, and 0 to 5000 in ohmsmode
Bit 06 Fault enable for channels 0-3
07 Fault enable for channels 4-7
0 = disabled
1 = enable wire-off detection

Publication 1797-6.5.2 - February 2001
1-6 About the FLEX Ex Thermocouple/RTD/mV Input Module

1Publication 1797-6.5.2 - February 2001
Chapter 2
Understanding Configurable FLEX Ex
Thermocouple/RTD/mV Input
Module Features
What this Chapter
Contains Read this chapter to familiarize yourself with configurable features on
the 1797-IRT8 module.
This chapter describes the following features:
•Input type
•Sensor type
•Data formats
•Preset temperature selection
•RTD loop resistance offset selections
•Fault mode
•Overrange Alarms
•Underrange alarms
•Fault alarms
Important:You must use your programming software to configure
these features. A brief description of each module feature
is provided in this chapter, but you must use the online
help included with your programming software to perform
specific configuration.
For information on: See page:
Setting a FLEX Ex Thermocouple/RTD
Module’s Operating Status 2-2
Input Type Select 2-2
Sensor Type Select 2-2
Data Format 2-4
Preset Temperature Select 2-5
RTD Loop Resistance Offset Select 2-6
Fault Mode Select 2-7
Using Module Alarms 2-7
Overrange Alarm 2-7
Underrange Alarm 2-8
Fault Alarm 2-9
Chapter Summary 2-9

Publication 1797-6.5.2 - February 2001
2-2 Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features
Setting a FLEX Ex
Thermocouple/RTD
Module’s Operating
Status
Input Type Select
Select the thermocouple or RTD mode for input channel groups 0-3
and 4-7. If 2 is selected, the module defaults to thermocouple. If 3 is
selected, the module defaults to RTD.
Range: 0 = thermocouple, 1 = RTD, 2 and 3 not used
Input type select for channels 4 through 7 use bits in word 1.
Sensor Type Select
Select the type of sensor for input channel groups 0-3 and 4-7.
Thermocouple mode 0 = mV, 1 = B, 2 = E, 3 = J, 4 = K, 5 = TXK/
XK(L), 6 = N, 7 = R, 8 = S, 9 = T, 10-15 not used.
RTD mode: 0 = W, 1 = Pt100 IEC 751 Amendment 2, 2 = Pt200 IEC 751
Amendment 2, 3 = Pt100 JIS C1604-1989, 4 = Pt200 JIS C1604-1989, 5 =
Ni100 DIN 43760-1987, 6 = Ni200 DIN 43760-1987, 7 = Ni120 Minco, 8
= Cu10 Minco, 9-15 not used.
If unused settings are chosen, diagnostic status “2 = configuration
failure” will be set, and the last valid configuration will be used. The
default = 0.
Bits 06-07 Input Type Select
Bit 07 06 Input type selection for channels 0-3
0 0 Thermocouple
01RTD
10
Not used
11

Publication 1797-6.5.2 - February 2001
Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features 2-3
Input Filter Cutoff
A series of eight available input filters – filters are hardware and
software – allow you to choose the best rolloff frequency for input
channels on your I/O module. When choosing a filter, remember that
time frequency rolloff may affect your input signal’s accuracy.
For example, in configuration word 0, if you choose the fastest time
frequency of 600Hz (hardware filter only), little noise is added, but the
slowest frequency of 0.2Hz will provide the most accurate process
noise filtering. See below to decide which input filter to use in your
application:
Bits 00-03 Sensor Type (Thermocouple or RTD)
RTD Type
Bit03020100Sensortypeforchannels0through3
0000Resistance(default)
0001100ohmPtα= 0.00385 Euro (–200 to +870°C)
0010200ohmPtα= 0.00385 Euro (–200 to +400°C)
0011100ohmPtα= 0.003916 U.S. (–200 to +630°C)
0100200ohmPtα= 0.003916 U.S. (–200 to +400°C)
0101100ohmNickel(–60to+250°C)
0110200ohmNickel(–60to+200°C)
0111120ohmNickel(–80to+320°C)
100010ohmCopper(–200 to +260°C)
1001 through 1111 not used
Bits 00-03 Thermocouple Type
Bit03020100Sensortypeforchannels0through3
0000mV(default)
0001B 300to1800°C (572 to 3272°F)
0010E –250 to 1000°C (–418 to 1832°F)
0011J –210 to 1200°C (–346 to 2192°F)
0100K –250 to 1372°C (–418 to 2502°F)
0101L –200 to 800°C (–328 to 1472°F)
0110N –250 to 1300°C (–418 to 2372°F)
0111R –0to1768°C (32 to 3214°F)
1000S –0to1768°C (32 to 3214°F)
1001T –250 to 400°C (–418 to 752°F)
1010 through 1111 not used

Publication 1797-6.5.2 - February 2001
2-4 Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features
Choose the best input filter cutoff in your programming software.
Data Format
You must choose a module data format in your user program. Select
the format by setting bits as shown below. Note that this parameter
affects channel accuracy.
oC, oF and oK will have formats appropriate to the selected
thermocouple or RTD range (e.g. -xxxx to +xxxx with 1 decimal place
implied - 3500 = 350.0). For Cu10 RTD, 2 decimal points are implied.
If using mV, data format defaults to -4000 to +10000 (2 decimal points
implied (e.g. -40 to 100.00). If using W mode selection, data format
defaults to 0 to 5000 (1 decimal point implied, e.g. 0.- to 500.0).
In the thermocouple and RTD modes, if unused data formats are
chosen, the module will default to oC.
Input Filter Cutoff bits
Bit020100Definition
0 0 0 Hardware filtering only (default filtering) 600Hz (1.7ms)
0 0 1 40Hz (25ms)
0 1 0 10Hz (100ms)
0 1 1 4Hz (250ms)
1 0 0 2Hz (500ms)
1011Hz(1s)
1100.5Hz(2s)
1110.2Hz(5s)
Data format – module defaults to –4000 to 10000 in millivolt mode, and 0 to 5000 in ohms mode
Bit 11 10 09 08 Data type for channels 0-7
0000°C
0001°F
0010×K
0 0 1 1 –32767 to +32767
0 1 0 0 0 to 65535
0101 through 1111 not used

Publication 1797-6.5.2 - February 2001
Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features 2-5
Sensor Mode Select
Selects the sensor mode for input channels 0-3 and 4-7.
If using cold junction compensation, both CJCs must be installed. The
difference between the CJCs will be linearly apportioned to each
thermocouple channel based on its position across the base. If one
CJC is broken or missing, the remaining CJC is used to compensate all
channels. The appropriate CJC alarm will be set in this case. If the
second CJC fails, the last valid reading is frozen for compensation use.
The second CJC alarm will also be set.
When using only channels 0-3 for thermocouples, connect the CJCs to
terminals 5 and 12. If only using channels 4-7, connect the CJCs to
terminals 22 and 29. If all channels are configured for thermocouples,
connect the CJCs to terminals 5 and 29.
When CJC thermistor temperature compensation is selected for one
channel group, all channels configured for thermocouple inputs will
use the CJC compensation.
Preset Temperature Select
This parameter is used if Input Type Select is set to thermocouple and
Sensor Mode Select is set to fixed compensation. This parameter then
sets a fixed reference temperature used to compensate all
thermocouple channels.
The default = 0.
Bit 05 04 Sensor mode for channels 0 thru 3
13 12 Sensor mode for channels 4 thru 7
Thermocouple Mode
00External compensation- uses cold junction sensors
0 1 Internal compensation - Uses the value selected for reference junction
10No compensation (Data is referenced to 0oC)
1 1 Differential measurement between 2 channels
RTD Mode
0 0 2-wire RTD - no compensation
0 1 2-wire RTD with user compensation
1 0 3-wire RTD
1 1 4-wire RTD

Publication 1797-6.5.2 - February 2001
2-6 Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features
RTD Loop Resistance Offset Select
This parameter is used if Input Type Select is set to RTD and Sensor
Mode Select is set to 2-wire with loop resistance compensation. This
parameter then sets total RTD loop resistance compensation for each
RTD channel. Either the value stored for each channel during
calibration is used to compensate the module RTD channels, or one of
3 fixed values is used to compensate module RTD channels.
This parameter is disabled for Cu10 RTDs.
Range: 0 = use channel loop compensation value determined and
stored during calibration procedure for 2-wire RTD, 1 = 5Ω, 2 = 10Ω,
3=15Ω. Default = 0.
Bits 03-05 Reference Junction – used when input type is set to thermocouple and sensor
mode is set to fixed compensation. Sets a fixed reference junction to compensate
all thermocouple channels.
Bit050403Reference Junction
0000°C
00120°C
01025°C
01130°C
10040°C
10150°C
11060°C
11170°C
00-15(00-17) RTD loop resistance offset select bits –usedinput typeissettoRTDand sensor
mode select is set to 2-wire with loop resistance compensation. Allows you to set
thetype ofRTDloopresistancecompensationused forallRTDsorone of threefixed
valuesforallchannels.NOTE: Notapplicableto10W copperRTD, whichdefaultsto
0W.
Bit 01 00 RTD channel 0
Bit 03 02 RTD channel 1
Bit 05 04 RTD channel 2
Bit 07 06 RTD channel 3
Bit 09 08 RTD channel 4
Bit 11 10 RTD channel 5
Bit 13 12 RTD channel 6
Bit 15 14 RTD channel 7
0 0 Use channel loop compensation value stored during
calibration procedure for 2-wire RTD (default = 0W)
015W
1 0 10W
1 1 15W