User Manual
Allen-Bradley
Thermocouple/
RTD/ Millivolt
Input Module
(Cat. No. 1794-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 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 which 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
in part, without written permission of Allen–Bradley Company, Inc.
is prohibited.
Throughout this manual we make notes to alert you to possible injury to
people or damage to equipment under specific circumstances.
!
ATTENTION: Identifies information about practices or
circumstances that can lead to personal injury or death,
property damage, or economic loss.
Attention helps you:
• identify a hazard
• avoid the hazard
• recognize the consequences
Important: Identifies information that is especially important for
successful application and understanding of the product.
Important: We recommend you frequently backup your application
programs on appropriate storage medium to avoid possible
data loss.
DeviceNet, DeviceNetManager, and RediSTATION are trademarks of Allen-Bradley Company, Inc.
PLC, PLC–2, PLC–3, and PLC–5 are registered trademarks of Allen-Bradley Company, Inc.
Windows is a trademark of Microsoft.
Microsoft is a registered trademark of Microsoft
IBM is a registered trademark of International Business Machines, Incorporated.
All other brand and product names are trademarks or registered trademarks of their respective companies.
Preface Objectives
Read this preface to familiarize yourself with this manual and to
learn how to use it properly and efficiently.
Audience
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.
In addition, if using this module in a DeviceNet system, you must be
familiar with:
• DeviceNetManager Software, cat. no. 1787-MGR
• Microsoft Windows
Vocabulary
In this manual, we refer to:
• the individual Thermocouple/RTD/mV module as the “module,”
or “TC/RTD module.”
• the programmable controller as the “controller” or the
“processor.”
What This Manual
Contains
The contents of this manual are as follows:
Chapter
Title
What’s Covered
1
Overview of Flex I/O and Your
Thermocouple/RTD/mV Module
Describes features, capabilities, and hardware
components
2
How to Install Your TC/RTD/mV Input
Module
Installation and connecting wiring
3
Module Programming
Block transfer programming and programming
examples
4
Writing Configuration to and Reading
Status from Your Module with a
Remote I/O Adapter
Describes block transfer write and block transfer read
configurations, including complete bit/word descriptions
5
How Communication Takes Place
and I/O Image Table Mapping with
the DeviceNet Adapter
Describes communication over the I/O backplane
between the module and the adapter, and how data is
mapped into the image table
6
Calibrating Your Module
Lists the tools needed, and the methods used to
calibrate the input module
Specifications
Module specifications and accuracy
Appendix
A
Publication 1794-6.5.12 – November 1997
P–2
Using This Manual
Conventions
We use these conventions in this manual:
In this manual, we show:
Like this:
that there is more information about a topic
in another chapter in this manual
that there is more information about the
topic in another manual
For Additional Information
More
For additional information on FLEX I/O systems and modules, refer
to the following documents:
Catalog
C
t og
Number
Publications
Vo t g
Voltage
1794
D c pt o
Description
Installation
Instructions
1794 FLEX I/O Product Data
1794-2.1
User
Manual
1794-ACN
24V dc
ControlNet Adapter
1794-5.8
1794-ACNR
24V dc
Redundant Media ControlNet Adapter
1794-5.18
1794-ACN15
24V dc
ControlNet Adapter
1794-5.47
1794-ACNR15
24V dc
Redundant Media ControlNet Adapter
1794-5.48
1794-ADN
24V dc
DeviceNet Adapter
1794-5.14
1794-6.5.5
1794-ASB/C
24V dc
Remote I/O Adapter
1794-5.50
1794-6.5.9
1794-ASB2/B
24V dc
2-Slot Remote I/O Adapter
1794-5.44
1794-6.5.13
1794-APB
24V dc
Profibus Adapter
1794-5.40
1794-6.5.6
1794-IB8
24V dc
8 Sink Input Module
1794-5.30
1794-OB8
24V dc
8 Source Output Module
1794-5.31
1794-IB16
24V dc
16 Sink Input Module
1794-5.4
1794-OB16
24V dc
16 Source Output Module
1794-5.3
1794-IV16
24V dc
16 Source Input Module
1794-5.28
1794-OV16
24V dc
16 Sink Output Module
1794-5.29
1794-OB8EP
24V dc
8 Electronically Fused Output Module
1794-5.20
1794-IB8S
24V dc
Sensor Input Module
1794-5.7
1794-IB10XOB6
24V dc
10 Input/6 Output Module
1794-5.24
1794-IE8
24V dc
Selectable Analog 8 Input Module
1794-5.6
1794-OE4
24V dc
Selectable Analog 4 Output Module
1794-5.5
1794-IE4XOE2
24V dc
4 Input/2 Output Analog Module
1794-5.15
Table continued on next page
Publication 1794-6.5.12 – November 1997
1794-6.5.2
Using This Manual
Publications
Catalog
Number
Voltage
1794-OF4
24V dc
4 Output Isolated Analog Module
1794-5.37
1794-IF4
24V dc
4 Input Isolated Analog Module
1794-5.38
1794-IF2XOF2
24V dc
2 Input/2 Output Isolated Analog Module
1794-5.39
1794-IR8
24V dc
8 RTD Input Analog Module
1794-5.22
1794-6.5.4
1794-IT8
24V dc
8 Thermocouple Input Module
1794-5.21
1794-6.5.7
1794-IRT8
24V dc
8 Thermocouple/RTD Input Module
1794-5.50
1794-6.5.12
1794-IJ2
24V dc
2 Frequency Input Module
1794-5.49
1794-6.5.11
1794-IA8
120V ac
8 Input Module
1794-5.9
1794-OA8
120V ac
Output Module
1794-5.10
1794-TB2
1794-TB3
2-wire Terminal Base
3-wire Terminal Base
1794-5.2
1794-TBN
Terminal Base Unit
1794-5.16
1794-TBNF
Fused Terminal Base Unit
1794-5.17
1794-TB3T
Temperature Terminal Base Unit
1794-5.41
1794-TB3S
Spring Clamp Terminal Base Unit
1794-5.42
1794-TB3TS
Spring Clamp Temperature Base Unit
1794-5.43
1794-TB3G
Terminal Base Unit
1794-5.51
1794-TB3GS
Spring Clamp Terminal Base Unit
1794-5.59
Extender Cables
1794-5.12
Mounting Kit
1794-2.13
Power Supply
1794-5.35
1794-CE1, -CE3
1794-NM1
1794-PS1
Summary
P–3
24V dc
Description
Installation
Instructions
User
Manual
1794-6.5.8
This preface gave you information on how to use this manual
efficiently. The next chapter introduces you to the
Thermocouple/RTD/mV input module.
Publication 1794-6.5.12 – November 1997
P–4
Using This Manual
Publication 1794-6.5.12 – November 1997
Table of Contents
Overview of FLEX I/O and
Your
Thermocouple/RTD/mV
Input Module
How to Install Your
Thermocouple/RTD/mV
Input Module
Programming Your
Thermocouple/RTD Input
Module
Chapter 1
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What the Thermocouple/RTD/mV Input Modules Does . . . . . . . . . .
How TC/RTD/mV Modules Communicate with
Programmable Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Communication Between an Adapter and a Module . . .
Features of Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–1
1–1
1–1
1–2
1–3
1–3
Chapter 2
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before You Install Your Input Module . . . . . . . . . . . . . . . . . . . . . . .
European Union Directive Compliance . . . . . . . . . . . . . . . . . . . . . .
EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Voltage Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring the Terminal Base Units (1794-TB3G shown) . . . . . . . .
Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting the Terminal Base Unit on a DIN Rail . . . . . . . . . . . . .
Panel/Wall Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting the Thermocouple/RTD/mV Module on the Terminal
Base Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Wiring for the TC/RTD/mV Module . . . . . . . . . . . . . . . .
Wiring connections for the 1794-IRT8 TC/RTD/mV Input Module .
Example of 2-, 3- and 4-wire RTD and Thermocouple Wiring to a
1794-TB3G Terminal Base Unit . . . . . . . . . . . . . . . . . . . .
Module Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1
2–1
2–1
2–1
2–2
2–2
2–3
2–4
2–4
2–6
2–8
2–9
2–11
2–12
2–13
2–13
Chapter 3
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enter Block Transfer Instructions . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-2 Family Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-3 Family Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-5 Family Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-5/250 Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1
3–1
3–2
3–2
3–3
3–4
3–5
Publication 1794-6.5.12 – November 1997
ii
Table of Contents
Writing Configuration to
and Reading Status from
Your Module with a Remote
I/O Adapter
How Communication Takes
Place and I/O Image Table
Mapping with the DeviceNet
Adapter
Calibrating Your Module
Chapter 4
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Your Thermocouple/RTD/mV Input Module . . . . . . . . . .
Sensor Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading Data From Your Module . . . . . . . . . . . . . . . . . . . . . . . . .
Mapping Data for the Thermocouple/RTD/mV Module . . . . . . . . . . .
Thermocouple/RTD Input Module (1794-IRT8) Image
Table Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermocouple/RTD/mV Input Module (1794-IRT8) Read Words
Bit/Word Descriptions for the Thermocouple/RTD Input Module
(1794-IRT8) Block Transfer Read Words . . . . . . . . . . . . .
Thermocouple/RTD/mV Input Module (1794-IRT8) Write Words
Bit/Word Definitions for the Block Transfer Write Words for the
TC/RTD/mV Input Module . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–3
4–3
4–4
4–5
4–5
4–9
Chapter 5
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About DeviceNetManager Software . . . . . . . . . . . . . . . . . . . . . . . .
Polled I/O Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adapter Input Status Word . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Throughput . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mapping Data into the
Image Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermocouple/RTD Input Module (1794-IRT8) Image
Table Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermocouple/RTD Input Module (1794-IRT8) Read Words . .
Thermocouple/RTD Input Module (1794-IRT8) Write Words . . .
Bit/Word Descriptions for the Thermocouple/RTD/mV
Input Module (1794-IRT8) . . . . . . . . . . . . . . . . . . . . . . . .
Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5–1
5–1
5–1
5–2
5–3
5–3
5–3
5–4
5–4
5–5
5–11
5–11
Chapter 6
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
When and How to Calibrate Your RTD/Thermocouple/mV Module . .
Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manually Calibrating your RTD/Thermocouple/mV Input Module . . .
Calibration Setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Connections for Calibrating the TC/RTD/mV Input Module
Read/Write Words for Calibration . . . . . . . . . . . . . . . . . . . . . . .
EDT Calibration Command and Command Data . . . . . . . . . . . . .
Offset Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gain Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Source Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cold Junction Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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4–1
4–1
4–2
4–3
4–3
6–1
6–1
6–2
6–2
6–3
6–3
6–4
6–5
6–6
6–7
6–8
6–8
iii
Specifications
Appendix A
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A–1
Publication 1794-6.5.12 – November 1997
iv
Table of Contents
Publication 1794-6.5.12 – November 1997
Chapter
1
Overview of FLEX I/O and Your
Thermocouple/RTD/mV Input
Module
What This Chapter
Contains
Read this chapter to familiarize yourself with the 1794-IRT8 module.
For information on
What the Thermocouple/RTD/mV Input Module Does . . . . . . .
How the module communicates . . . . . . . . . . . . . . . . . . . . . .
Module features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What the
Thermocouple/RTD/mV
Input Modules Does
See page
1–1
1–1
1–3
The 1794-IRT8 module accepts up to 8 thermocouple or RTD inputs.
The inputs are nonisolated and are selected with analog multiplexers
which have a common–mode input range of +4 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 TC/RTD Input module. The
Inputs have both fixed hardware filters and selectable firmware
digital filters.
How TC/RTD/mV Modules
Communicate with
Programmable Controllers
FLEX I/O Thermocouple/RTD/mV modules are block transfer
modules that interface analog signals with any Allen-Bradley
programmable controllers that have block transfer capability. Block
transfer programming moves input or output data words between the
module’s memory and a designated area in the processor data table.
Block transfer programming also moves configuration words from
the processor data table to module memory.
The adapter/power supply transfers data to the module (block
transfer write) and from the module (block transfer read) using BTW
and BTR instructions in your ladder diagram program. These
instructions let:
• the adapter obtain input or output values and status from the
module
• you establish the module’s mode of operation.
The illustration describes the communication process.
Publication 1794-6.5.12 – November 1997
1–2
Overview of FLEX I/O and Your Thermocouple/RTD/mV Input Module
Typical Communication Between an Adapter and a Module
1
2
The adapter transfers your configuration data
to the module using a BTW.
External devices transmit
analog signals to the module.
Flexbus
Allen-Bradley
Allen-Bradley
1794–IRT8
TC RTD INPUT 8 CHANNEL
ADAPTER
ACTIVE
FAULT
LOCAL
FAULT
3
4
24VDC
POWER SUPPLY
RIO ADAPTER
1794-ASB
Your ladder program instructs the
adapter to perform a BTR of the values
and stores them in a data table.
PWR
IN 0
F
5
The adapter and module determine
that the transfer was made without error
and input values are within specified
range.
6
Your ladder program can use and/or move the data (if valid)
before it is written over by the transfer of new data in a
subsequent transfer.
7
Your ladder program performs BTWs to the module only when you
power it up, or any time you wish to reconfigure the module.
Publication 1794-6.5.12 – November 1997
IN 1
F
IN 2
F
IN 3
F
IN 4
F
IN 5
F
IN 6
F
IN 7
F
3
The module converts analog
signals into binary format and
stores these values until the
adapter requests their transfer.
Overview of FLEX I/O and Your Thermocouple/RTD/mV Input Module
Features of Your Module
1–3
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.
1794-IRT8
Module Type
Removable Label
Allen-Bradley
1794–IRT8
TC RTD INPUT 8 CHANNEL
3
Keyswitch
Position Indicator (#3)
PWR
IN 0
F
IN 1
F
IN 2
F
IN 3
F
IN 4
F
IN 5
F
IN 6
F
IN 7
F
Power On Indicator
Input Designators
Chapter Summary
In this chapter, we told you about the FLEX I/O system and the
Thermocouple/RTD/mV input module, and how they communicate
with programmable controllers.
Publication 1794-6.5.12 – November 1997
1–4
Overview of FLEX I/O and Your Thermocouple/RTD/mV Input Module
Publication 1794-6.5.12 – November 1997
Chapter
2
How to Install Your
Thermocouple/RTD/mV Input
Module
What This Chapter
Contains
Before You Install Your
Input Module
In this chapter, we tell you:
For information on
See page
Before You Install Your Module . . . . . . . . . . . . . . . . . . . . . . .
European Union Directives . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
on a DIN rail . . . . . . . . . . . . . . . . . . .
on a wall/panel
on the terminal base
Connecting Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Indicators . . . . . . . . . . . . . . . . . .
2–1
2–1
2–2
2–4
2–4
2–6
2–8
2–9
2–13
Before installing your TC/RTD/mV module:
You need to:
As described under:
Calculate the power requirements of all
modules in this FLEX system.
Power Requirements, page 2-2
Position the keyswitch on the terminal base
Installing the Module, page 2–4
!
European Union Directive
Compliance
ATTENTION: The TC/RTD/mV module does not
receive power from the backplane. +24V dc power
must be applied to your module before installation. If
power is not applied, the module position will appear
to the adapter as an empty slot in your chassis.
If this product has the CE mark it is approved for installation within
the European Union and EEA regions. It has been designed and
tested to meet the following directives.
EMC Directive
This product is tested to meet Council Directive 89/336/EEC
Electromagnetic Compatibility (EMC) and the following standards,
in whole or in part, documented in a technical construction file:
• EN 50081-2EMC – Generic Emission Standard, Part 2 –
Industrial Environment
• EN 50082-2EMC – Generic Immunity Standard, Part 2 –
Industrial Environment
This product is intended for use in an industrial environment.
Publication 1794-6.5.12 – November 1997
2–2
How to Install Your Thermocouple/RTD/mV Input Module
Low Voltage Directive
This product is tested to meet Council Directive 73/23/EEC
Low Voltage, by applying the safety requirements of EN 61131–2
Programmable Controllers, Part 2 – Equipment Requirements and
Tests.
For specific information required by EN 61131-2, see the appropriate
sections in this publication, as well as the following Allen-Bradley
publications:
• Industrial Automation Wiring and Grounding Guidelines For
Noise Immunity, publication 1770-4.1
• Guidelines for Handling Lithium Batteries, publication AG-5.4
• Automation Systems Catalog, publication B111
This equipment is classified as open equipment and must be mounted
in an enclosure during operation to provide safety protection.
Power Requirements
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 10A.
!
Publication 1794-6.5.12 – November 1997
ATTENTION: Total current draw through the
terminal base unit is limited to 10A. Separate power
connections may be necessary.
How to Install Your Thermocouple/RTD/mV Input Module
2–3
Methods of wiring the terminal base units are shown in the
illustration below.
Wiring the Terminal Base Units (1794-TB3G shown)
!
ATTENTION: Do not daisy chain power or
ground from the terminal base unit to any ac or dc
digital module terminal base unit.
Daisy-chaining
TC/RTD/mV
Module
24V dc
TC/RTD/mV
Module
TC/RTD/mV
Module
Frequency Input
Module
Note: All modules must be frequency or TC/RTD/mV modules for this configuration.
Wiring when total current draw is less than 10A
Individual
Digital Input
Module
TC/RTD/mV
Module
Digital Input
Module
Digital Output
Module
24V dc
24V dc
Note: Use this configuration if using any
“noisy” dc digital I/O modules in your system.
24V dc
Thermocouple/RTD/mV Module wiring separate from digital wiring.
Wiring when total current draw is greater than 10A
Combination
Frequency Input
Module
Frequency Input
Module
TC/RTD/mV
Module
Frequency Input
Module
24V dc
24V dc
Note: All modules powered by the same power supply
must be frequency or TC/RTD/mV modules for this configuration.
Total current draw through any base unit must not be greater than 10A
Publication 1794-6.5.12 – November 1997
2–4
How to Install Your Thermocouple/RTD/mV Input Module
Installing the Module
Installation of the analog module consists of:
• mounting the terminal base unit
• installing the TC/RTD/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 “Mounting the Thermocouple/RTD/mV
Module on the Terminal Base” on page 2–8.
Mounting the Terminal Base Unit on a DIN Rail
!
ATTENTION: 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.
1. Remove the cover plug (if used) in the male connector of the unit
to which you are connecting this terminal base unit.
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.
3. Position the terminal base on the 35 x 7.5mm DIN rail A (A-B pt.
no. 199-DR1; 46277-3) at a slight angle with hook B on the left
side of the terminal base hooked into the right side of the unit on
the left. Proceed as follows:
B
A
A
Position terminal base at a slight angle and hooked over the
top of the DIN rail.
Publication 1794-6.5.12 – November 1997
How to Install Your Thermocouple/RTD/mV Input Module
2–5
Slide the terminal base unit over tight against the adapter.
Make sure the hook on the terminal base slides under the edge of
the adapter and the flexbus connector is fully retracted.
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.
30077–M
Gently push the flexbus connector into the side
of the adapter to complete the backplane connection.
Publication 1794-6.5.12 – November 1997
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How to Install Your Thermocouple/RTD/mV Input Module
4. Repeat the above steps to install the next terminal base.
Panel/Wall Mounting
Installation 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 “Mounting the Thermocouple/RTD/mV
Module on the Terminal Base” on page 2–8.
Use the mounting kit Cat. No. 1794-NM1 for panel/wall mounting.
1.4
(35.5)
1794-NM1 Mounting Kit
Contents:
1 – Mounting Plate for Adapter
2 – 18 #6 self-tapping screws
(2 for the adapter, and 2
each for up to 8 modules)
1
2
Adapter Module
(not included)
Terminal Base Unit
(not included)
Publication 1794-6.5.12 – November 1997
How to Install Your Thermocouple/RTD/mV Input Module
2–7
To install the mounting plate on a wall or panel:
1. Lay out the required points on the wall/panel as shown in the
drilling dimension drawing.
Drilling Dimensions for Panel/Wall Mounting of FLEX I/O
Inches
(Millimeters)
1.4
(35.5)
2.3
(58.5)
1.4
(35.5)
2.3
(58.5)
1.4
(35.5)
.83 (21)
2. Drill the necessary holes for the #6 self-tapping mounting screws.
3. Mount the mounting plate (1) for the adapter module using two
#6 self-tapping screws (18 included for mounting up to 8 modules
and the adapter).
Important:
More
Make certain that the mounting plate is properly
grounded to the panel. Refer to “Industrial Automation
Wiring and Grounding Guidelines,” publication
1770-4.1.
4. Hold the adapter (2) 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.
Note: The adapter is capable of addressing eight modules. Do not
exceed a maximum of eight terminal base units in your system.
Publication 1794-6.5.12 – November 1997
2–8
How to Install Your Thermocouple/RTD/mV Input Module
Mounting the Thermocouple/RTD/mV Module on the Terminal
Base Unit
The TC/RTD/mV input module mounts on a 1794-TB3G or TB3GS
terminal base unit.
1. Rotate the keyswitch (1) on the terminal base unit (2) clockwise
to position 3 as required for the TC/RTD/mV module.
7
3
1
2
6
4
5
2. Make certain the flexbus connector (3) is pushed all the way to
the left to connect with the neighboring terminal base/adapter.
You cannot install the module unless the connector is fully
extended.
3. Make sure that the pins on the bottom of the module are straight
so they will align properly with the connector in the terminal base
unit.
!
ATTENTION: Remove field-side power before
removing or inserting the module. This module is
designed so you can remove and insert it under
backplane power. When you remove or insert a
module with field-side power applied, an electrical arc
may occur. An electrical arc can cause personal injury
or property damage by:
• sending an erroneous signal to your system’s field
devices causing unintended machine motion
• causing an explosion in a hazardous environment
Repeated electrical arcing causes excessive wear to
contacts on both the module and its mating connector.
Worn contacts may create electrical resistance.
4. Position the module (4) with its alignment bar (5) aligned with
the groove (6) on the terminal base.
Publication 1794-6.5.12 – November 1997
How to Install Your Thermocouple/RTD/mV Input Module
2–9
5. Press firmly and evenly to seat the module in the terminal base
unit. The module is seated when the latching mechanism (7) is
locked into the module.
6. Repeat the above steps to install the next module in its terminal
base unit.
Connecting Wiring for the
TC/RTD/mV Module
Wiring to the TC/RTD/mV module is made through the terminal
base unit on which the module mounts.
Compatible terminal base units are:
Module
1794-TB3G
1794-TB3GS
1794-IRT8
Yes
Yes
1794-TB3G
1794-TB3GS
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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
0
1 2 3 4 5
6 7
8 9 10 11 12 13 14 15
A
0 –15
A
B
16–33
B
C
34–51
C
Label placed at top of wiring area.
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
34 and 50 = 24V dc
35 and 51 = common
16 and 33 = chassis ground
40 thru 45 = chassis ground
34 and 50 = 24V dc
35 and 51 = common
16 and 33 = chassis ground
40 thru 45 = chassis ground
Connecting Wiring using a 1794-TB3G and -TB3GS Terminal Base
Units
1. Connect the individual signal wiring to numbered terminals on
the 0–15 row (A) and 17–32 row (B) on the terminal base unit.
Connect the input devices as shown in the wiring table on page
2–11.
2. Terminate shields:to terminals 16 or 33 on row B, or 40 through
45 on row C.
3. Connect +24V dc to terminal 34 on the 34-51 row (C), and 24V
common to terminal 35 on the 34-51 row (C).
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How to Install Your Thermocouple/RTD/mV Input Module
ATTENTION: To reduce susceptibility to noise,
power TC/RTD/mV modules and digital modules from
separate power supplies. Do not exceed a length of 33
ft (10m) for dc power cabling.
!
4. If daisy chaining the +24V dc power to the next base unit,
connect a jumper from terminal 50 (+24V) on this base unit to
terminal 34 and from terminal 51 (24V dc common) to terminal
35 on the next base unit.
ATTENTION: Do not daisy chain power or ground
from the TC/RTD/mV terminal base unit to any ac or
dc digital module terminal base unit.
!
ATTENTION: The TC/RTD/mV modules do not
receive power from the backplane. +24V dc power
must be applied to your module before operation. If
power is not applied, the module position will appear
to the adapter as an empty slot in your chassis. If the
adapter does not recognize your module after
installation is completed, cycle power to the adapter.
!
Connections for Terminal Base 1794-TB3G shown
0
1
+
2
3
H
L
Channel 0
–
17
16
+
18
19
H
L
Channel 4
4
+
5
6
7
8
H
L
Channel 1
–
+
20
–
21
+
22
23
H
L
Channel 5
9
24
–
10
11
12
H
L
Channel 2
–
+
25
+
26
27
H
L
Channel 6
13
14
15
H
L
Channel 3
–
28
29
–
+
30
31
H
L
Channel 7
Chassis Gnd
35
34
+V
COM
24V dc
Supply
In
Publication 1794-6.5.12 – November 1997
32
33
–
Chassis Gnd
36
37
Gnd
CJC
38
39
40
41
42
43
6 Chassis Ground
for Shields
44
45
46
47
Gnd
CJC
48
49
50
+V
51
COM
24V dc
Supply Out
How to Install Your Thermocouple/RTD/mV Input Module
RTD
1
Wiring connections for the 1794-IRT8 TC/RTD/mV Input Module
2
2-wire
3-wire
Connect the following:
Typ of
Type
o Input
I p t
1
3
2
H
4-wire
1
1a
2a
2
L
+
–
1
2
3
1
2
2a
1
2
RTD – 2-wire
RTD – 3-wire
RTD – 4-wire
Thermocouple
2–11
1a
Thermocouple
1
2
Millivolt
1
2
Shield1
1 Terminals 37, 38 and 39 and 46, 47 and 48 are for cold junction compensation (with 38
and 47 chassis GND).
1
2
1
Millivolt
+
mV
–
2
1794-TB3G and -TB3GS Terminal Base Units
RTD or
Th moco p
Thermocouple
Channel
High Signal
Terminal (H)
Low Signal
Terminal (L)
RTD Source
Current (+)
Signal
Return1 (–)
0
1
2
0
3
1
5
6
4
7
2
9
10
8
11
3
13
14
12
15
4
18
19
17
20
5
22
23
21
24
6
26
27
25
28
7
30
31
29
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 (with 38 and 47 chassis GND). Connect
CJC1 to terminal 5 or 21; CJC2 to terminal 12 or 29.
2 Terminals 16, 33 and 40 thru 45 are chassis ground.
!
ATTENTION: Total current draw through the
terminal base unit is limited to 10A. Separate power
connections to the terminal base unit may be necessary.
Publication 1794-6.5.12 – November 1997
2–12
How to Install Your Thermocouple/RTD/mV Input Module
Example of 2-, 3- and 4-wire RTD and Thermocouple Wiring to
a 1794-TB3G Terminal Base Unit
Thermocouple Channel 4
1
+
2
–
2-Wire RTD Channel 1
1
2
3-Wire RTD Channel 2
1
3
2
4-Wire RTD Channel 3
1
1a
2a
2
0
1
0
1
17
16
34
2
18
35
3
2
3
19
36
4
4
20
37
5
5
21
38
6
6
22
39
7
7
23
40
8
8
24
41
9
9
25
42
10
10
26
43
11
11
27
44
12
12
28
45
13
13
29
46
14
14
30
47
15
15
31
48
32
49
33
50
51
0 –15
A
16–33
B
34–51
C
1794-TB3G
CJC
Attention: Keep exposed area of inner conductor as short as possible.
Publication 1794-6.5.12 – November 1997
How to Install Your Thermocouple/RTD/mV Input Module
Module Indicators
2–13
The Thermocouple/RTD/mV module has one status indicator (PWR)
that is on when power is applied to the module and one fault
indicator (F) for each input.
Allen-Bradley
1794–IRT8
TC RTD INPUT 8 CHANNEL
3
IN 0
F
IN 1
F
IN 2
F
A
IN 3
F
IN 4
F
IN 5
F
IN 6
F
B
IN 7
F
PWR
C
A = Insertable label for writing individual input designations
B = Fault Indicator – indicates successful power up or noncritical fault
C = Power Indicator – indicates power applied to module
Indicator
Fault
Color
Red
State
On
Meaning
At power up – Channel 0 indicator lights at powerup until all
internal diagnostics are checked. After successful powerup, the
indicator goes off if no fault is present.
After successful powerup – Indicates a critical fault (diagnostic
failure, etc.)
Power
Green
Chapter Summary
Blinking (when
faults are enabled,
and bit set)
Indicates a noncritical fault (such as open sensor.) Input data
set to maximum, and indicator flashes at 1Hz rate.
Off
Module not powered
On
Module receiving power.
In this chapter, we told you how to install your input module in an
existing programmable controller system and how to wire to the
terminal base units.
Publication 1794-6.5.12 – November 1997
2–14
How to Install Your Thermocouple/RTD/mV Input Module
Publication 1794-6.5.12 – November 1997
Chapter
3
Programming Your
Thermocouple/RTD Input
Module
What This Chapter
Contains
To initiate communication between the Thermocouple/RTD input
module 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.
To edit your ladder logic you
Enter Block Transfer Instructions . . . . . . . . . . . . . . . . . . . . .
PLC-2 Family Processors . . . . . . . . . . . . . . . . . . . . . . . .
PLC-3 Family Processors . . . . . . . . . . . . . . . . . . . . . . . .
PLC-5 Family Processors . . . . . . . . . . . . . . . . . . . . . . . .
PLC-5/250 Processors . . . . . . . . . . . . . . . . . . . . . . . . . .
Enter Block Transfer
Instructions
See page
3–1
3–2
3–2
3–3
3–4
The Thermocouple/RTD input module communicates 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
analog 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 filters and signal ranges, etc. Block
transfer reads are performed to retrieve information from the module.
Block transfer read (BTR) programming moves status and data from
the module to the processor’s 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.
Publication 1794-6.5.12 – November 1997
3–2
Programming Your Thermocouple/RTD Input Module
PLC-2 Family Processor
The 1794 Thermocouple/RTD/mV modules are not recommended
for use with PLC-2 family programmable controllers due to the
number of digits needed for high resolution.
Important:
The Thermocouple/RTD input module functions with
reduced performance in PLC-2 systems. Because the
module does 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.
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 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.
Publication 1794-6.5.12 – November 1997
Programming Your Thermocouple/RTD Input Module
PLC-3 Processor
Program Example
3–3
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/BTW
Control Block
BTR
BLOCK TRANSFER READ
Rack
3
Group
2
Slot
1
Control
B17:0
Data File
N18:101
Length
0
IRT8 BTR
Done Bit
B17:0
15
EN
DN
ER
IRT8 BTR
Error Bit
B17:0
U
13
IRT8 BTR
Error Bit
B17:0
13
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/BTW
Control Block
IRT8 BTW
Done Bit
B17:0
BTW
BLOCK TRANSFER WRITE
Rack
3
Group
2
Slot
1
Control
B17:0
Data
N18:1
Length
0
5
IRT8 BTW
Error Bit
B17:0
EN
DN
ER
IRT8 BTW
Error Bit
B17:0
U
3
3
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.
Publication 1794-6.5.12 – November 1997
3–4
PLC-5 Processor
Program Example
Programming Your Thermocouple/RTD Input Module
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
between 0 and 11. In enhanced PLC-5 processors➀, the block transfer data type may be used as a control file.
IRT8 BTR
IRT8 BTW
IRT8 BTR
Control File
Enable Bit
BTR
Enable Bit
BLOCK TRANSFER READ
EN
N22:205
N22:200
Rack
02
Group
2
DN
Slot
1
15
15
Control
N22:200
ER
Data File
N22:101
Length
0
Continuous
N
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 processors1, the
block transfer data type may be used as a control file.
IRT8 BTR
Enable Bit
IRT8 BTW
Enable Bit
N22:200
N22:205
15
15
➀ Enhanced
IRT8 BTW
Control File
BTW
BLOCK TRANSFER WRITE
Rack
02
Group
2
Slot
1
Control
N22:205
Data File
N22:1
Length
0
Continuous
N
EN
DN
ER
PLC-5 processors include: PLC-5/11, -5/20, -5/3x, -5/4x, and -5/6x.
PLC-5/250 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 will automatically select 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.
Publication 1794-6.5.12 – November 1997
Programming Your Thermocouple/RTD Input Module
PLC-5/250 Processor
Program Example
3–5
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.
IRT8 BTR
IRT8 BTW
IRT8 BTR
Control File
Enable Bit
BTR
Enable Bit
BLOCK TRANSFER READ
EN
BW141:0
BR141:0
Rack
14
Group
1
DN
Slot
0
EN
EN
Control Block
BR141:0
ER
Data File
2BTD5:101
BT Length
0
Continuous
NO
BT Timeout
4
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
BR141:0
EN
Chapter Summary
IRT8 BTW
Enable Bit
BW141:0
IRT8 BTW
Control File
BTW
BLOCK TRANSFER WRITE
Rack
14
Group
1
Slot
0
Control Block
BW141:0
Data File
2BTD5:1
BT Length
0
Continuous
NO
4
BT Timeout
EN
EN
DN
ER
In this chapter, you learned how to program with your IRT8 input
module using block transfer instructions and ladder logic. Now, you
can configure your module.
4
Configure the
IRT8 Module
Publication 1794-6.5.12 – November 1997
3–6
Programming Your Thermocouple/RTD Input Module
Publication 1794-6.5.12 – November 1997
Chapter
4
Writing Configuration to and
Reading Status from Your
Module with a Remote I/O
Adapter
What This Chapter
Contains
Configuring Your
Thermocouple/RTD/mV
Input Module
In this chapter, we tell you about:
For information on
See page
Configuring Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sensor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading Data from Your Module . . . . . . . . . . . . . . . . . . . . . .
Mapping Data for the Module . . . . . . . . . . . . . . . . . . . . . . . .
TC/RTD Input Module (1794-IRT8) Image Table Mapping . . . .
Block Transfer Read Word Assignments . . . . . . . . . . . . . . . .
Bit/Word Definitions for Block Transfer Read Words . . . . . . . .
Block Transfer Write Word Assignments . . . . . . . . . . . . . . . .
Bit/Word Definitions for the Block Transfer Write Words . . . . .
4–1
4–2
4–3
4–3
4–3
4–3
4–4
4–5
4–5
The TC/RTD/mV input module is configured using a group of data
table words that are transferred to the module using a block transfer
write instruction.
The software configurable features available are:
• input range selection
• selectable single pole low pass filter
• data reported in oF, oC, oK, mV, ohms, unipolar or bipolar count
Note: Programmable controllers that use 6200 software (release 4.2
or higher) programming tools can take advantage of the IOCONFIG
Addendum utility to configure this module. IOCONFIG Addendum
uses menu–based screens for configuration without having to set
individual bits in particular locations. Refer to your 6200 software
literature for details.
Important:
It is strongly recommended that you use IOCONFIG
Addendum to configure this module. The IOCONFIG
Addendum utility greatly simplifies configuration. If
the IOCONFIG Addendum is not available, you must
enter data directly into the data table. Use this chapter
as a reference when performing this task.
Publication 1794-6.5.12 – November 1997
4–2
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Sensor Types
Individual input channels are configurable to operate with the
following sensor types:
RTD Type
Sensor type for channels 0 through 3
Sensor type for channels 4 through 7
Resistance (default)
100 ohm Pt α = 0.00385 Euro (–200 to +870oC)
200 ohm Pt α = 0.00385 Euro (–200 to +400oC)
100 ohm Pt α = 0.003916 U.S. (–200 to +630oC)
200 ohm Pt α = 0.003916 U.S. (–200 to +400oC)
100 ohm Nickel α = 0.00618 (–60 to +250oC)
200 ohm Nickel α = 0.00618 (–60 to +200oC)
120 ohm Nickel α = 0.00672 (–80 to +320oC)
10 ohm Copper α = 0.00427 (–200 to +260oC)
Thermocouple Type
Sensor type for channels 0 through 3
Sensor type for channels 4 through 7
mV (default)
B
300 to 1800oC
(572 to 3272oF)
E
–270 to 1000oC
(–454 to 1832oF)
J
–210 to 1200oC
(–346 to 2192oF)
K
–270 to 1372oC
(–454 to 2502oF)
L
-200 to 800oC
(-328 to 1472oF)
N
–270 to 1300oC
(–450 to 2372oF)
R
–50 to 1768oC
(–58 to 3214oF)
S
–50 to 1768oC
(–58 to 3214oF)
T
–270 to 400oC
(–454 to 752oF)
You select individual channel ranges using write word 1 of the block
transfer write instruction.
Publication 1794-6.5.12 – November 1997
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
4–3
Reading Data From Your
Module
Read programming moves status and data from the TC/RTD input
module to the processor’s data table in one I/O scan. The processor’s
user program initiates the request to transfer data from the TC/RTD
input module to the processor.
Mapping Data for the
Thermocouple/RTD/mV
Module
The following read and write words and bit/word descriptions
describe the information written to and read from the TC/RTD input
module. The 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/RTD Input Module (1794-IRT8) Image Table
Mapping
Module Image
Input Data Channel 0
Input Data Channel 1
I/O Image
Input Data Channel 2
Input Size
Input Data Channel 3
1 to 11 Words
Input Data Channel 4
Input Data Channel 5
Input Data Channel 6
Input Data Channel 7
Overrange
Underrange
Alarms
Output Size
RFlg
CJC
Diagnostics
EDT command and response
Data Format
0 to 4 Words
TC/RTD Mode Sensor Type
FM Reference Jct Filter Cut
TC/RTD Mode Sensor Type
RTD Offsets for each channel
CFlg
EDT command and data
Thermocouple/RTD/mV Input Module (1794-IRT8) Read Words
Decimal
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Octal
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
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
5
Channel 5 Input Data
6
Channel 6 Input Data
7
Channel 7 Input Data
Publication 1794-6.5.12 – November 1997
4–4
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Decimal
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Octal
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
8
Overrange Alarm Bits (channel 0 = bit 08, etc)
9
Flt Alm
Ch7
10
Resp
Flg
Flt
Alm
Ch5
Flt Alm
Ch6
Flt
Alm
Ch4
Flt
Alm
Ch3
Flt
Alm
Ch2
Underrange Alarm Bits (channel 0 = bit 00, etc)
Flt
Alm
Ch1
Flt Alm
CJC 2 CJC 1
Rsvd
Rsvd
Ch0
Alm
Alm
EDT command response
Diagnostic Status
EDT response data
Bit/Word Descriptions for the Thermocouple/RTD Input Module
(1794-IRT8) Block Transfer Read Words
Word
Dec. Bits
(Octal Bits)
Description
Read Word 0
00–15 (00–17)
Channel 0 Input data
Read Word 1
00–15 (00–17)
Channel 1 Input data
Read Word 2
00–15 (00–17)
Channel 2 Input data
Read Word 3
00–15 (00–17)
Channel 3 Input data
Read Word 4
00–15 (00–17)
Channel 4 Input data
Read Word 5
00–15 (00–17)
Channel 5 Input data
Read Word 6
00–15 (00–17)
Channel 6 Input data
Read Word 7
00–15 (00–17)
Channel 7 Input data
Read Word 8
00–07
08–15 (10–17)
Read Word 9
00–03
Underrange bits – these bits are set if the input signal is below the input channel’s minimum range.
Bit 00 corresponds to channel 0, bit 01 corresponds to channel 1, etc.
Overrange bits – these bits are set if 1), the input signal is above the input channel’s maximum
range, or 2), an open detector is detected. Bit 08 (10) corresponds to channel 0, bit 09 (11)
corresponds to channel 1, etc.
Diagnostic bits – represent module configuration and/or hardware errors.
Bit
03
02
01
00
0
0
0
0
Reserved for factory use
0
0
1
0
Improper module configuration
0001 and 0011 thru 1111 Reserved for factory use
04
05–06
07
08–15 (10–17)
Read Word 10
00–07
08–14 (10–16)
15 (17)
Publication 1794-6.5.12 – November 1997
Not used.
Cold junction compensation alarm bits – These bits are set (1) when the corresponding cold
junction compensator lead is broken, unattached or shorted. Bit 05 corresponds to CJC1, and bit 06
to CJC2.
Not used
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, etc.
Extended data table command response data bits – These bits echo the EDT command data
written to the module during calibration.
Extended data table command response bits – These bits echo the EDT command written to the
module during calibration.
Reserved for factory use
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
4–5
Thermocouple/RTD/mV Input Module (1794-IRT8) Write
Words
Output Mapping
Decimal
ct
Octal
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Flt Mode
Ch 0-3
Flt Mode
Ch 4-7
Write
Word⇓
0
Not used
Data Format
1
TC/RTD
Ch. 4-7
Sensor Mode
Ch. 4-7
2
RTD Offset Ch 7
RTD Offset Ch 6
3
Cmd
Flag
Sensor Mode Ch. 4-7
RTD Offset
Ch 5
RTD Offset
Ch 4
Reference Jct.
TC/RTD Ch. 0-3
Sensor
Mode
Ch. 0-3
RTD Offset Ch 3
RTD Offset
Ch 2
EDT command
Filter Cutoff
Sensor Mode Ch. 0-3
RTD Offset
Ch 1
RTD
Offset Ch
0
EDT command data
Bit/Word Definitions for the Block Transfer Write Words for the
TC/RTD/mV Input Module
Word
Dec. Bits
(Octal Bits)
Write Word 0
00–02
Description
Input Filter Cutoff bits
Bit
Bits 03–05
02
01
00
Definition
0
0
0
Hardware filtering only (default filtering)
0
0
1
40Hz
0
1
0
10Hz
0
1
1
4Hz
1
0
0
2Hz
1
0
1
1Hz
1
1
0
0.5Hz
1
1
1
0.2Hz
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 oC
0
0
1
20oC
0
1
0
25oC
0
1
1
30oC
1
0
0
40oC
1
0
1
50oC
1
1
0
60oC
1
1
1
70oC
Publication 1794-6.5.12 – November 1997
4–6
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Word
Dec. Bits
(Octal Bits)
Write Word 0
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 to 10000 in millivolt mode, and 0 to 5000 in
ohms mode
Description
Bit
11
10
09
08
Data type for channels 0–7
0
0
0
oC
0
0
1
oF
0
1
0
oK
0
1
1
–32767 to +32767
1
0
0
0 to 65535
0101 through 1111 not used
Write Word 1
Bits 12–15
(14–17)
Not used
Bits 00–03
Sensor Type (Thermocouple or RTD)
RTD Type
Bit
03
02
01
00
Sensor type for channels 0 through 3
0
0
0
0
Resistance (default)
0
0
0
1
100 ohm Pt α = 0.00385 Euro (–200 to +870oC)
0
0
1
0
200 ohm Pt α = 0.00385 Euro (–200 to +400oC)
0
0
1
1
100 ohm Pt α = 0.003916 U.S. (–200 to +630oC)
0
1
0
0
200 ohm Pt α = 0.003916 U.S. (–200 to +400oC)
0
1
0
1
100 ohm Nickel (–60 to +250oC)
0
1
1
0
200 ohm Nickel (–60 to +200oC)
0
1
1
1
120 ohm Nickel (–80 to +320oC)
1
0
0
0
10 ohm Copper (–200 to +260oC)
1001 through 1111 not used
Publication 1794-6.5.12 – November 1997
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Word
Write Word 1
cont.
Dec. Bits
(Octal Bits)
Bits 00–03
4–7
Description
Thermocouple Type
Bit
03
02
01
00
Sensor type for channels 0 through 3
0
0
0
0
mV (default)
0
0
0
1
B
300 to 1800oC (572 to 3272oF)
0
0
1
0
E
–270 to 1000oC (–454 to 1832oF)
0
0
1
1
J
–210 to 1200oC (–346 to 2192oF)
0
1
0
0
K
–270 to 1372oC (–454 to 2502oF)
0
1
0
1
L
-200 to 800oC (-328 to 1472oF)
0
1
1
0
N
–270 to 1300oC (–450 to 2372oF)
0
1
1
1
R
–50 to 1768oC (–58 to 3214oF)
1
0
0
0
S
–50 to 1768oC (–58 to 3214oF)
1
0
0
1
T
–270 to 400oC (–454 to 752oF)
1010 through 1111 not used
Bits 04–05
Sensor Mode Select bits
Bit
05
04
Sensor mode select for channels 0–3
Thermocouple
0
0
External compensation – uses cold junction sensor
0
1
Internal compensation – uses the value selected for reference junction
1
0
No compensation (Data is referenced to 0oC.)
1
1
Differential measurement between 2 channels
0
0
2-wire RTD no compensation
0
1
2-wire RTD with loop resistance compensation
1
0
3-wire RTD
1
1
4-wire RTD
RTD
Bits 06–07
Input Type Select
Bit
07
06
Input type selection for channels 0–3
0
0
Thermocouple
0
1
RTD
1
0
1
1
Not used
u e
Publication 1794-6.5.12 – November 1997
4–8
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Word
Write Word 1
Dec. Bits
(Octal Bits)
Bits 08–11
10–13
(10–13)
Description
Sensor Type (Thermocouple or RTD)
RTD Type
Bit
11
10
09
08
Sensor type for channels 4 through 7
0
0
0
0
Resistance (default)
0
0
0
1
100 ohm Pt α = 0.00385 Euro (–200 to +870oC)
0
0
1
0
200 ohm Pt α = 0.00385 Euro (–200 to +400oC)
0
0
1
1
100 ohm Pt α = 0.003916 U.S. (–200 to +630oC)
0
1
0
0
200 ohm Pt α = 0.003916 U.S. (–200 to +400oC)
0
1
0
1
100 ohm Nickel (–60 to +250oC)
0
1
1
0
200 ohm Nickel (–60 to +200oC)
0
1
1
1
120 ohm Nickel (–80 to +320oC)
1
0
0
0
10 ohm Copper (–200 to +260oC)
1001 through 1111 not used
Thermocouple Type
Bit
11
10
09
08
Sensor type for channels 4 through 7
0
0
0
0
mV (default)
0
0
0
1
B
300 to 1800oC (572 to 3272oF)
0
0
1
0
E
–270 to 1000oC (–454 to 1832oF)
0
0
1
1
J
–210 to 1200oC (–346 to 2192oF)
0
1
0
0
K
–270 to 1372oC (–454 to 2502oF)
0
1
0
1
L
-200 to 800oC (-328 to 1472oF)
0
1
1
0
N
–270 to 1300oC (–450 to 2372oF)
0
1
1
1
R
–50 to 1768oC (–58 to 3214oF)
1
0
0
0
S
–50 to 1768oC (–58 to 3214oF)
1
0
0
1
T
–270 to 400oC (–454 to 752oF)
1010 through 1111 not used
Bits 12–13
(14–15)
14–15
Sensor Mode Select bits
Bit
13
12
Sensor mode select for channels 4–7
Thermocouple
0
0
External compensation – uses cold junction sensor
0
1
Internal compensation – uses the value selected for reference junction
1
0
No compensation (Data is referenced to 0oC.)
1
1
Differential measurement between 2 channels
0
0
2-wire RTD no compensation
0
1
2-wire RTD with loop resistance compensation
1
0
3-wire RTD
1
1
4-wire RTD
RTD
Publication 1794-6.5.12 – November 1997
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Word
word 1 cont.
Write Word 2
Write Word 3
Dec. Bits
(Octal Bits)
Bit
00–15 (00–17)
00–07
15
14
Input type selection for channels 4–7
0
0
Thermocouple
0
1
RTD
1
0
1
1
Not used
u e
RTD loop resistance offset select bits – used when input type is set to RTD and
sensor mode select is set to 2-wire with loop resistance compensation. 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 10Ω copper RTD, which defaults
to 0Ω.
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 = 0Ω)
0
1
5Ω
1
0
10Ω
1
1
15Ω
Extended data table command data bits – These bits are written to the module
during calibration. They are used to define offset, gain and general channel calibration.
08–14 (10–16)
Chapter Summary
Description
Input Type Select
Bits 14–15
16–17
(16–17)
15 (17)
4–9
Extended data table command bits – These bits are written to the module during
calibration. They are used to select channel calibration action.
Reserved for factory use only
In this chapter, you learned how to configure your module’s features
and enter your data.
Publication 1794-6.5.12 – November 1997
4–10
Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Publication 1794-6.5.12 – November 1997
Chapter
5
How Communication Takes
Place and I/O Image Table
Mapping with the DeviceNet
Adapter
Chapter Objectives
In this chapter, we tell you about:
•
•
•
•
About DeviceNetManager
Software
More
Polled I/O Structure
DeviceNetManager software
I/O structure
image table mapping
factory defaults
DeviceNetManager software is a tool used to configure your FLEX
I/O DeviceNet adapter and its related modules. This software tool
can be connected to the adapter via the DeviceNet network.
You must understand how DeviceNetManager software works in
order to add a device to the network. Refer to the DeviceNetManager
Software User Manual, publication 1787-6.5.3.
Output data is received by the adapter in the order of the installed
I/O modules. The Output data for Slot 0 is received first, followed
by the Output data for Slot 1, and so on up to slot 7.
The first word of input data sent by the adapter is the Adapter Status
Word. This is followed by the input data from each slot, in the order
of the installed I/O modules. The Input data from Slot 0 is first after
the status word, followed by Input data from Slot 2, and so on up to
slot 7.
DeviceNet Adapter
Read Data
Adapter Status
Slot 0 Input Data
Network READ
Slot 1 Input Data
...
...
Slot 7 Input Data
Read
Write Data
Write
I/O Module I/O Module
Slot 0
Slot 1
...
I/O Module
Slot 7
Slot 0 Output Data
Slot 1 Output Data
...
...
Network WRITE
Slot 7 Output Data
Publication 1794-6.5.12 – November 1997
5–2
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Adapter Input Status Word
The input status word consists of:
• I/O module fault bits – 1 status bit for each slot
• node address changed – 1 bit
• I/O status – 1 bit
I/O Module Fault Bits
Slot 0
Slot 1
1 0
Slot 2
Not Used
Slot 3
9 8 7 6 5 4 3 2
Slot 5
Slot 4
10 through 15
Slot 6
15
Slot 7
Bit:
I/O State Bit
Node Address Changed Bit
The adapter input status word bit descriptions are shown in the
following table.
Bit Description
Bit
Explanation
0
This bit is set (1) when an error is detected in slot position 0.
1
This bit is set (1) when an error is detected in slot position 1.
2
This bit is set (1) when an error is detected in slot position 2.
3
This bit is set (1) when an error is detected in slot position 3.
4
This bit is set (1) when an error is detected in slot position 4.
5
This bit is set (1) when an error is detected in slot position 5.
6
This bit is set (1) when an error is detected in slot position 6.
7
This bit is set (1) when an error is detected in slot position 7.
Node Address Changed
8
This bit is set (1) when the node address switch setting has been
changed since power up.
I/O State
9
Bit = 0 – idle
Bit = 1 – run
I/O Module
o ule Fault
ault
10 thru 15
Not used – sent as zeroes.
Possible causes for an I/O Module Fault are:
•
•
•
•
•
transmission errors on the Flex I/O backplane
a failed module
a module removed from its terminal base
incorrect module inserted in a slot position
the slot is empty
The node address changed bit is set when the node address switch
setting has been changed since power up. The new node address does
not take affect until the adapter has been powered down and then
powered back up.
Publication 1794-6.5.12 – November 1997
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
System Throughput
5–3
System throughput, from analog input to backplane, is a function of:
• the data format selected
• the type and mode of sensors selected
• whether filtering is selected
The A/D converter which converts channel 0 through 7 analog data
to a digital word provides a programmable single low pass filter. You
can set the frequency of this filter during module configuration. The
selection influences the A/D output data rate, thus affecting system
throughput.
Mapping Data into the
Image Table
FLEX I/O Thermocouple/RTD input module data table mapping is
shown below.
Thermocouple/RTD Input Module (1794-IRT8) Image Table
Mapping
Module Image
Input Data Channel 0
Input Data Channel 1
I/O Image
Input Data Channel 2
Input Size
Input Data Channel 3
1 to 11 Words
Input Data Channel 4
Input Data Channel 5
Input Data Channel 6
Input Data Channel 7
Overrange
Underrange
Alarms
Output Size
RFlg
CJC
EDT command and response
Data Format
0 to 4 Words
Diagnostics
TC/RTD Mode Sensor Type
FM Reference Jct Filter Cut
TC/RTD Mode Sensor Type
RTD Offsets for each channel
CFlg
EDT command and data
Publication 1794-6.5.12 – November 1997
5–4
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Thermocouple/RTD Input Module (1794-IRT8) Read Words
Decimal
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Octal
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Word⇓
Read
1
Channel 0 Input Data
2
Channel 1 Input Data
3
Channel 2 Input Data
4
Channel 3 Input Data
5
Channel 4 Input Data
6
Channel 5 Input Data
7
Channel 6 Input Data
8
Channel 7 Input Data
9
Overrange Alarm Bits (channel 0 = bit 08, etc)
Flt Alm
Ch7
10
Flt Alm
Ch6
Flt
Alm
Ch5
Flt
Alm
Ch4
11
Flt
Alm
Ch3
Flt
Alm
Ch2
Underrange Alarm Bits (channel 0 = bit 00, etc)
Flt
Alm
Ch1
Flt Alm
Ch0
CJC 2
Alm
CJC 1
Alm
EDT command response
Diagnostic Status
EDT response data
Thermocouple/RTD Input Module (1794-IRT8) Write Words
Decimal
Octal
ct
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Flt Mode
Ch 0-3
Flt Mode
Ch 4-7
Write
Word⇓
1
Data Format
2
TC/RTD
Ch. 4-7
Sensor Mode
Ch. 4-7
3
RTD Offset Ch 7
RTD Offset Ch 6
4
Sensor Mode Ch. 4-7
RTD Offset
Ch 5
EDT command
Publication 1794-6.5.12 – November 1997
RTD Offset
Ch 4
Reference Jct.
TC/RTD Ch. 0-3
Sensor
Mode
Ch. 0-3
RTD Offset Ch 3
RTD Offset
Ch 2
Filter Cutoff
Sensor Mode Ch. 0-3
RTD Offset
Ch 1
EDT command data
RTD
Offset Ch
0
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
5–5
Bit/Word Descriptions for the Thermocouple/RTD/mV Input
Module (1794-IRT8)
Word
Dec. Bits
(Octal Bits)
Description
Read Word 1
00–15 (00–17)
Channel 0 Input data
Read Word 2
00–15 (00–17)
Channel 1 Input data
Read Word 3
00–15 (00–17)
Channel 2 Input data
Read Word 4
00–15 (00–17)
Channel 3 Input data
Read Word 5
00–15 (00–17)
Channel 4 Input data
Read Word 6
00–15 (00–17)
Channel 5 Input data
Read Word 7
00–15 (00–17)
Channel 6 Input data
Read Word 8
00–15 (00–17)
Channel 7 Input data
Read Word 9
00–07
08–15 (10–17)
Read Word 10
00–03
Underrange bits – these bits are set if the input signal is below the input channel’s minimum range.
Bit 00 corresponds to channel 0, bit 01 corresponds to channel 1, etc.
Overrange bits – these bits are set if 1), the input signal is above the input channel’s maximum
range, or 2), an open detector is detected. Bit 08 (10) corresponds to channel 0, bit 09 (11)
corresponds to channel 1, etc.
Diagnostic bits – represent module configuration and/or hardware errors.
Bit
03
02
01
00
0
0
0
0
Reserved for factory use
0
0
1
0
Improper module configuration
0001 and 0011 thru 1111 Reserved for factory use
04
05–06
07
08–15 (10–17)
Read Word 11
00–07
08–14 (10–16)
15 (17)
Not used.
Cold junction compensation alarm bits – These bits are set (1) when the corresponding cold
junction compensator lead is broken, unattached or shorted. Bit 05 corresponds to CJC1, and bit 06
to CJC2.
Not used
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, etc.
Extended data table command response data bits – These bits echo the EDT command data
written to the module during calibration.
Extended data table command response bits – These bits echo the EDT command written to the
module during calibration.
Reserved for factory use
Publication 1794-6.5.12 – November 1997
5–6
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Word
Dec. Bits
(Octal Bits)
Write Word 1
Bits 00–02
Description
Input Filter Cutoff bits
Bit
Bits 03–05
02
01
00
Definition
0
0
0
Hardware filtering only (default filtering)
0
0
1
40Hz
0
1
0
10Hz
0
1
1
4Hz
1
0
0
2Hz
1
0
1
1Hz
1
1
0
0.5Hz
1
1
1
0.2Hz
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 oC
0
0
1
20oC
0
1
0
25oC
0
1
1
30oC
1
0
0
40oC
1
0
1
50oC
1
1
0
60oC
1
1
1
70oC
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)
10–13
Data format – module defaults to –4000 to 10000 in millivolt mode, and 0 to 5000 in ohms mode
Bit
11
10
09
08
0
0
0
oC
0
0
1
oF
0
1
0
oK
0
1
1
–32767 to +32767
1
0
0
0 to 65535
0101 through 1111 not used
Bits 12–15
(14–17)
Publication 1794-6.5.12 – November 1997
Not used
Data type for channels 0–7
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Word
Dec. Bits
(Octal Bits)
Write Word 2
Bits 00–03
5–7
Description
Sensor Type (Thermocouple or RTD)
RTD Type
Bit
03
02
01
00
Sensor type for channels 0 through 3
0
0
0
0
Resistance (default)
0
0
0
1
100 ohm Pt α = 0.00385 Euro (–200 to +870oC)
0
0
1
0
200 ohm Pt α = 0.00385 Euro (–200 to +400oC)
0
0
1
1
100 ohm Pt α = 0.003916 U.S. (–200 to +630oC)
0
1
0
0
200 ohm Pt α = 0.003916 U.S. (–200 to +400oC)
0
1
0
1
100 ohm Nickel (–60 to +250oC)
0
1
1
0
200 ohm Nickel (–60 to +200oC)
0
1
1
1
120 ohm Nickel (–80 to +320oC)
1
0
0
0
10 ohm Copper (–200 to +260oC)
1001 through 1111 not used
Bits 00–03
Thermocouple Type
Bit
03
02
01
00
Sensor type for channels 0 through 3
0
0
0
0
mV (default)
0
0
0
1
B
300 to 1800oC (572 to 3272oF)
0
0
1
0
E
–270 to 1000oC (–454 to 1832oF)
0
0
1
1
J
–210 to 1200oC (–346 to 2192oF)
0
1
0
0
K
–270 to 1372oC (–454 to 2502oF)
0
1
0
1
L
-200 to 800oC (-328 to 1472oF)
0
1
1
0
N
–270 to 1300oC (–450 to 2372oF)
0
1
1
1
R
–50 to 1768oC (–58 to 3214oF)
1
0
0
0
S
–50 to 1768oC (–58 to 3214oF)
1
0
0
1
T
–270 to 400oC (–454 to 752oF)
1010 through 1111 not used
Publication 1794-6.5.12 – November 1997
5–8
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Word
Write word 2
cont.
Dec. Bits
(Octal Bits)
Bits 04–05
Description
Sensor Mode Select bits
Bit
05
04
Sensor mode select for channels 0–3
0
0
External compensation – uses cold junction sensor
0
1
Internal compensation – uses the value selected for reference junction
1
0
No compensation (Data is referenced to 0oC.)
1
1
Differential measurement between 2 channels
0
0
2-wire RTD no compensation
0
1
2-wire RTD with loop resistance compensation
1
0
3-wire RTD
1
1
4-wire RTD
Thermocouple
RTD
Bits 06–07
Input Type Select
Bit
Publication 1794-6.5.12 – November 1997
07
06
Input type selection for channels 0–3
0
0
Thermocouple
0
1
RTD
1
0
1
1
Not used
u e
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Word
Dec. Bits
(Octal Bits)
Write Word 2
cont.
Bits 08–11
10–13
(10–13)
5–9
Description
Sensor Type (Thermocouple or RTD)
RTD Type
Bit
11
10
09
08
Sensor type for channels 4 through 7
0
0
0
0
Resistance (default)
0
0
0
1
100 ohm Pt α = 0.00385 Euro (–200 to +870oC)
0
0
1
0
200 ohm Pt α = 0.00385 Euro (–200 to +400oC)
0
0
1
1
100 ohm Pt α = 0.003916 U.S. (–200 to +630oC)
0
1
0
0
200 ohm Pt α = 0.003916 U.S. (–200 to +400oC)
0
1
0
1
100 ohm Nickel (–60 to +250oC)
0
1
1
0
200 ohm Nickel (–60 to +200oC)
0
1
1
1
120 ohm Nickel (–80 to +320oC)
1
0
0
0
10 ohm Copper (–200 to +260oC)
1001 through 1111 not used
Thermocouple Type
Bit
11
10
09
08
Sensor type for channels 4 through 7
0
0
0
0
mV (default)
0
0
0
1
B
300 to 1800oC (572 to 3272oF)
0
0
1
0
E
–270 to 1000oC (–454 to 1832oF)
0
0
1
1
J
–210 to 1200oC (–346 to 2192oF)
0
1
0
0
K
–270 to 1372oC (–454 to 2502oF)
0
1
0
1
L
-200 to 800oC (-328 to 1472oF)
0
1
1
0
N
–270 to 1300oC (–450 to 2372oF)
0
1
1
1
R
–50 to 1768oC (–58 to 3214oF)
1
0
0
0
S
–50 to 1768oC (–58 to 3214oF)
1
0
0
1
T
–270 to 400oC (–454 to 752oF)
1010 through 1111 not used
Bits 12–13
(14–16)
14–16
Sensor Mode Select bits
Bit
13
12
Sensor mode select for channels 4–7
0
0
External compensation – uses cold junction sensor
0
1
Internal compensation – uses the value selected for reference junction
1
0
No compensation (Data is referenced to 0oC.)
1
1
Differential measurement between 2 channels
0
0
2-wire RTD no compensation
0
1
2-wire RTD with loop resistance compensation
1
0
3-wire RTD
1
1
4-wire RTD
Thermocouple
RTD
Publication 1794-6.5.12 – November 1997
5–10
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Word
Dec. Bits
(Octal Bits)
Write Word 2
cont.
Bits 14–15
16–17
(16–17)
Write Word 3
Write Word 4
00–15 (00–17)
Description
Input Type Select
Bit
15
14
Input type selection for channels 4–7
0
0
Thermocouple
0
1
RTD
1
0
1
1
Not used
u e
RTD loop resistance offset select bits – used input type is set to RTD and sensor mode select is
set to 2-wire with loop resistance compensation. 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 10Ω copper RTD, which defaults to 0Ω.
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 = 0Ω)
0
1
5Ω
1
0
10Ω
1
1
15Ω
00–07
Extended data table command data bits – These bits are written to the module during calibration.
They are used to define offset, gain and general channel calibration.
08–14 (10–16)
Extended data table command bits – These bits are written to the module during calibration. They
are used to select channel calibration action.
15 (17)
Publication 1794-6.5.12 – November 1997
Reserved for factory use only.
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Defaults
5–11
Each I/O module has default values associated with it. At default,
each module will generate inputs/status and expect
outputs/configuration.
Module Defaults for:
Catalog
Number
1794-IRT8
Description
8-Input Thermocouple/RTD Input
Factory Defaults
Real Time Size
Input
Default
Output
Default
Input
Default
Output
Default
11
4
8
0
Factory defaults are the values assigned by the adapter when you:
• first power up the system, and
• no previous stored settings have been applied.
For analog modules, the defaults reflect the actual number of input
words/output words. For example, for the 8 Thermocouple/RTD
input module, you have 11 input words, and 4 output words.
You can change the I/O data size for a module by reducing the
number of words mapped into the adapter module, as shown in “real
time sizes.”
Real time sizes are the settings that provide optimal real time data to
the adapter module.
Analog modules have 15 words assigned to them. This is divided
into input words/output words. You can reduce the I/O data size to
fewer words to increase data transfer over the backplane.
More
Chapter Summary
For information on using DeviceNetManager software to configure
your adapter, refer to the DeviceNetManager Software User Manual,
publication 1787-6.5.3.
In this chapter, you learned how this module communicates over the
DeviceNet, and the image table mapping for the module.
Publication 1794-6.5.12 – November 1997
5–12
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Publication 1794-6.5.12 – November 1997
Chapter
6
What This Chapter
Contains
When and How to
Calibrate Your
RTD/Thermocouple/mV
Module
Use this chapter to calibrate the thermocouple/RTD/mV input
module. We tell you about:
For information on
When and How to Calibrate Your TC/RTD Module . . . . . . . . . . . .
Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manually Calibrating your Thermocouple/RTD/mV Input Module . .
Calibration Setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Connections for the TC/RTD Module . . . . . . . . . . . . . .
Read/Write Words for Calibration . . . . . . . . . . . . . . . . . . . . .
See page
6–1
6–2
6–2
6–3
6–3
6–4
EDT Calibration Commands and Command Data . . . . . . . . . . . . .
Offset Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gain Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Source Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cold Junction Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6–5
6–6
6–7
6–8
6–8
Your module is shipped to you already calibrated. If a calibration
check is required, the module must be in a FLEX I/O system.
Perform module calibration periodically, based on your application.
Module calibration may also be required to remove module error due
to aging of components in your system.
Offset calibration must be done first, followed by gain calibration.
Calibration can be accomplished using any of the following methods:
• manual calibration, as described below.
• 6200 I/O CONFIGURATION software – refer to your 6200
software publications for procedures for calibrating.
• DeviceNetManager Software – refer to your DeviceNet Manager
software documentation for the DeviceNet Adapter Module, Cat.
No. 1794-ADN.
Important: You must use a 1794-TB3G or -TB3GS terminal base
when calibrating this module.
Publication 1794-6.5.12 – November 1997
6–2
Calibrating Your Module
Tools and Equipment
To calibrate your Thermocouple/RTD/mV input module, you will
need the following tools and equipment:
Tool or Equipment
Precision Resistors
Description
High Precision Resistors:
383Ω, 0.01%, 5ppm/oC
100Ω, 0.01%, 5ppm/oC
10 Kohm, 0.5%, 5ppm/oC
Precision Voltage Source
+320mV, 1µV resolution
Industrial Terminal and
Interconnect Cable
Programming terminal for A–B family processors
Manually Calibrating your
RTD/Thermocouple/mV
Input Module
Analogic 3100, Data Precision 8200 or equivalent
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.
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 from the module (BTR).
Important:
To allow the internal module temperature to stabilize,
apply power to the module for at least 20 minutes
before calibrating.
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).
3. The module will return a BTR which echoes back the message
sent in the BTW word.
The module stores this input data.
4. Apply a second reference signal to the module.
5. Send a second message indicating which inputs to read and what
calibration step is being performed (gain).
6. The module computes new calibration values for the inputs and
returns a BTR which echoes back the message sent in the BTW
word. If the calibration is cannot be completed, the module
returns a fault message.
Publication 1794-6.5.12 – November 1997
Calibrating Your Module
6–3
Calibration Setups
Using Precision Resistors –
for 383Ω and 100Ω calibration
0
1
0
2
1
17
16
18
4
3
19
35
34
3
2
20
36
5
4
7
22
38
7 8
6
21
37
6
5
23
39
9
24
40
9 10
8
25
41
26
42
11
10
27
43
12 13
11
12
28
44
29
45
14
13
30
46
15
14
15
31
47
32
48
49
33
50
51
Using Precision Voltage Source –
for offset and gain calibration
0
+
1
0
–
1
17
16
34
2
2
18
35
3
3
19
36
4
5
4
5
20
37
21
38
6
7
6
22
7
23
39
40
Precision Voltage Source
8
9
8
24
41
9
25
42
10
11
12 13 14
15
10
11
12
15
26
43
27
44
28
45
13
29
46
14
30
47
31
48
32
49
33
50
51
1794-TB3G
Connect + to terminals 2, 6, 10, 14, 19, 23, 27, and 31
Connect – to terminals 3, 7, 11, 15, 20, 21, 28 and 32
Connect one 10K ohm, 0.5% resistor across terminals 37 and 39 and another across 46 and 48.
Wiring Connections for Calibrating the TC/RTD/mV Input Module
Typ of
Type
o Input
I p t
RTD – 4-wire
Connect the following:
H
L
+
–
1a
2a
1
2
Millivolt
1
Shield1
2
1 Terminals 37, 38 and 39 and 46, 47 and 48 are for cold junction compensation (with 38 and 47 chassis GND).
1794-TB3G and -TB3GS Terminal Base Units
RTD or
Th moco p
Thermocouple
Channel
High Signal
Terminal (H)
Low Signal
Terminal (L)
RTD Source
Current (+)
Signal
Return1 (–)
0
1
2
0
3
1
5
6
4
7
2
9
10
8
11
3
13
14
12
15
4
18
19
17
20
5
22
23
21
24
6
26
27
25
28
7
30
31
29
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 (with 38 and 47 chassis GND).
2 Terminals 16, 33 and 40 thru 45 are chassis ground.
Publication 1794-6.5.12 – November 1997
6–4
Calibrating Your Module
Read/Write Words for Calibration
Decimal
ct
Octal
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
Flt Mode
Ch 0-3
Flt Mode
Ch 4-7
Write
Word⇓
0
Data Format
1
TC/RTD
Ch. 4-7
Sensor Mode
Ch. 4-7
2
RTD Offset Ch 7
RTD Offset Ch 6
3
Sensor Mode Ch. 4-7
RTD Offset
Ch 5
RTD Offset
Ch 4
Reference Jct.
TC/RTD Ch. 0-3
Sensor
Mode
Ch. 0-3
RTD Offset Ch 3
RTD Offset
Ch 2
EDT command
Filter Cutoff
Sensor Mode Ch. 0-3
RTD Offset
Ch 1
RTD
Offset Ch
0
EDT command data
Decimal
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Octal
17
16
15
14
13
12
11
10
07
06
05
04
03
02
01
00
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
5
Channel 5 Input Data
6
Channel 6 Input Data
7
Channel 7 Input Data
8
9
Overrange Alarm Bits (channel 0 = bit 08, etc)
Flt Alm
Ch7
Flt Alm
Ch6
Flt
Alm
Ch5
10
Publication 1794-6.5.12 – November 1997
Flt
Alm
Ch4
Flt
Alm
Ch3
Flt
Alm
Ch2
EDT command response
Flt
Alm
Ch1
Underrange Alarm Bits (channel 0 = bit 00, etc)
Flt Alm
Ch0
CJC 2
Alm
CJC 1
Alm
Not
used
EDT response data
Diagnostic Status
Calibrating Your Module
6–5
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EDT Calibration Command and Command Data
Command
Meaning
Dec. (Hex)
4
5
6
36 (24)
General Calibration by Channel
Offset Calibration by Channel
Gain Calibration by Channel
Data
(up nibble)
Data
(low nibble)
channel
command
0–15
0
0–15
1
channel internal current source and current sense
resistor, with 4-wire external 383Ω inputs
0–15
2
channel internal current source and current sense
resistor with 4-wire external 100Ω inputs
0–15
3
loop resistance compensation for 2 wire RTD
0–15
4
CJC calibration
0–15
5–15
not used
0–15
0
gain= 1,
input = –320 mV
0–15
1
gain= 2,
input = 0.0 mV
0–15
2
gain= 4,
input = –50 mV
0–15
3
gain= 8,
input = –10.0 mV
0–15
4
gain= 16,
input = –9 mV
0–15
5
gain= 32,
input = 1.0 mV
0–15
6
gain= 64,
input = –4.0 mV
0–15
7
gain= 128,
input = –2.0 mV
0–15
8–15
0–15
0
gain= 1,
input = 320 mV
0–15
1
gain= 2,
input = 320 mV
0–15
2
gain= 4,
input = 110 mV
0–15
3
gain= 8,
input = 70 mV
0–15
4
gain= 16,
input = 29 mV
0–15
5
gain= 32,
input = 19 mV
0–15
6
gain= 64,
input = 4.0 mV
0–15
7
gain= 128,
input = 2.0 mV
0–15
8–15
not used
0
0
zero offset and gain coefficients
0
1
channel internal current source and current sense
resistor, with 4-wire external 383Ω inputs
0
2
channel internal current source and current sense
resistor with 4-wire external 100Ω inputs
0
3
loop resistance compensation for 2 wire RTD
0
4
CJC calibration
0
5–15
1
0
gain= 1,
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
1
6
gain= 64,
input = –4.0 mV
Meaning
zero offset and gain coefficients
not used
Calibration all Channels
General Calibration all Channels
Offset Calibration all Channels
not used
input = –320 mV
Publication 1794-6.5.12 – November 1997
6–6
Calibrating Your Module
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Command
Meaning
Data
(up nibble)
Data
(low nibble)
1
7
1
8–15
2
Gain Calibration all Channels
Meaning
gain= 128,
input = –2.0 mV
0
gain= 1,
input = 320 mV
2
1
gain= 2,
input = 320 mV
2
2
gain= 4,
input = 110 mV
2
3
gain= 8,
input = 70 mV
2
4
gain= 16,
input = 29 mV
2
5
gain= 32,
input = 19 mV
2
6
gain= 64,
input = 4.0 mV
2
7
gain= 128,
input = 2.0 mV
2
8–15
not used
not used
Offset Calibration
Inputs can be calibrated one at a time or all at once. To calibrate the
offsets for all inputs at once, 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 –320.00mV 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.
Gain Selected
Input (mV)
EDT Command
Hex
Decimal
1
–320.00+0.160mV
2410
9232
2
0.000+0.001mV
2411
9233
4
–50.00+0.025mV
2412
9234
8
–10.00+0.005mV
2413
9235
16
–9.00+0.005mV
2414
9236
32
1.000+0.001mV
2415
9237
64
–4.000+0.002mV
2416
9238
128
–2.000+0.001mV
2417
9239
3. Initiate a BTW to the module with the appropriate value in BTW
word 3, bits 00–15, as shown above.
4. Monitor the block transfer read word 10 bits 00–15 for an echo of
the EDT command.
Publication 1794-6.5.12 – November 1997
Calibrating Your Module
6–7
If the BTR word reads 80FF (hex), repeat the BTW. Make sure that
sufficient time is allowed for the module to respond to your request.
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.
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 320.00mV 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.
Gain Selected
Input (mV)
EDT Command
Hex
Decimal
1
320.00+0.160mV
2420
9248
2
320.00+0.160mV
2421
9249
4
110+0.055mV
2422
9250
8
70.00+0.035mV
2423
9251
16
29.00+0.015mV
2424
9252
32
19.00+0.010mV
2425
9253
64
4.000+0.002mV
2426
9254
128
2.000+0.001mV
2427
9255
2. Apply power to the module for 20 minutes before calibrating.
3. After the connections stabilize, send a block transfer write with
the corresponding EDT command for your input to the module.
4. Monitor the block transfer read word 10 bits 00–15 for an echo of
the EDT command.
If the BTR word reads 80FF (hex), repeat the BTW. Make sure that
sufficient time is allowed for the module to respond to your request.
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 gain calibrations are successful, proceed to “current
source calibration.”
Publication 1794-6.5.12 – November 1997
6–8
Calibrating Your Module
Current Source Calibration
The current sources can be calibrated one at a time or all at once. To
calibrate the current source for all inputs at once, proceed as follows:
1. Connect a 383 ohm, 0.01% resistor across (H, +) and (L, –) of
each input channel (8 resistors).
2. Apply power to the module for 20 minutes before calibrating.
3. Initiate a BTW to the module with the2401 (hex) value in BTW
word 3, bits 00–15, as shown above.
4. Monitor the block transfer read word 10, bits 00–15 for an echo
of the EDT command.
If the BTR word reads 80FF (hex) (indicating a failed calibration),
repeat the BTW. Make sure that sufficient time is allowed for the
module to respond to your request.
5. Connect a 100 ohm, 0.01% resistor across (H, +) and (L, –) of
each input channel (8 resistors). Repeat steps 3 and 4 using a
BTW value of 2402 (hex).
6. When all calibrations are successful, proceed to the “cold junction
calibration.”
Cold Junction Calibration
Both cold junction compensation inputs must be calibrated together.
To calibrate both at once, proceed as follows:
1. Connect a 10 Kohm, 0.5% resistor across terminals 37 and 39 (cjc
1) and terminals 46 and 48 (cjc 2).
2. Apply power to the module for 20 minutes before calibrating.
3. Initiate a BTW to the module with the 2404 (hex) value in BTW
word 3, bits 00–15.
4. Monitor the block transfer read word 10, bits 00–15 for an echo
of the EDT command.
If the BTR word reads 80FF (hex) (indicating a failed calibration),
repeat the BTW. Make sure that sufficient time is allowed for the
module to respond to your request.
Publication 1794-6.5.12 – November 1997
Specifications – 1794-IRT8 Thermocouple/RTD/mV Input Module
Number of Inputs
8 Channels (2 groups of 4)
Module Location
Cat. No. 1794-TB3G, -TB3GS Terminal Base Unit
Nominal Ranges
–40 to +100mV dc for thermocouples
0 to 500Ω for RTDs
Supported Thermocouple Types
Type B:
Type E:
Type J:
Type K:
Type L
Type N:
Type R:
Type S:
Type T:
Supported RTD Types
Resistance:
100 ohm Pt α = 0.00385 Euro (–200 to +870oC)
100 ohm Pt α = 0.003916 U.S. (–200 to +630oC)
200 ohm Pt α = 0.00385 Euro (–200 to +400oC)
200 ohm Pt α = 0.003916 U.S. (–200 to +400oC)
100 ohm Nickel α = 0.00618 (–60 to +250oC)
120 ohm Nickel α = 0.00672 (–80 to +320oC)
200 ohm Nickel α = 0.00618 (–60 to +200oC)
10 ohm Copper α = 0.00427 (–200 to +260oC)
Resolution
14 bits
Accuracy vs. filter Cutoff
0.2Hz = 0.05% of full range in millivolt mode
0.5Hz = 0.05% of full range in millivolt mode
1.0Hz = 0.05% of full range in millivolt mode
2.0Hz = 0.05% of full range in millivolt mode
4.0Hz = 0.05% of full range in millivolt mode
10.0Hz = 0.05% of full range in millivolt mode
40.0Hz = 0.05% of full range in millivolt mode
Hardware only = 0.10% of full range in millivolt mode
Data Format
oC
oF
oK
300 to 1800oC (572 to 3272oF)
(–454 to 1832oF)
–270 to 1000oC
o
(–346 to 2192oF)
–210 to 1200 C
(–454 to 2502oF)
–270 to 1372oC
o
–200 to 800 C (–328 to 1472oF)
(–454 to 2372oF)
–270 to 1300oC
o
–50 to 1768 C (–58 to 3214oF)
–50 to 1768oC (–58 to 3214oF)
–270 to 400oC (–454 to 752oF)
–32767 to +32767
0–65535
0–5000 (ohms mode)
–4000 to +10000 (millivolt mode)
Common Mode Rejection
–80db @ 5V peak-to-peak 50–60Hz
Common Mode Input Range
+4V minimum
Isolation Voltage
1500V ac (rms) or 2550V dc for 1.0s between customer and
system
Specifications continued on next page.
Publication 1794-6.5.12 – November 1997
A–2
Specifications
Specifications – 1794-IRT8 Thermocouple/RTD/mV Input Module
System Throughput (8 channels
scanned)
For maximum throughput short circuit all unused channels.
4ms – millivolt
6.0ms – ohms – 2- and 4-wire RTD
10.0ms – ohms – 3-wire RTD
6.4ms – 2- and 4-wire RTD (oF)
6.8ms – 2- and 4-wire RTD (oC), (oK)
10.2ms – 3-wire RTD (oF)
10.6ms – 3-wire RTD (oC), (oK)
5.6ms – Thermocouples (oF)
6.0ms – Thermocouples (oC), (oK)
Open Circuit Detection
Defaults to maximum value
Open Input Detection Time
0 to 6.5s depending on input type and mode selected
1.3s – Thermocouple
3.8s – 2- and 4-wire RTD
6.5s – 3-wire RTD
Overvoltage Capability
7V dc continuous @ 25oC
RFI Immunity
Error of less than 1% of range at 10V/M
27 to 1000MHz
Overall Drift with Temperature
150ppm/oC of span (maximum)
Cold Junction Compensation range
0 to 70oC
Cold Junction Compensator
A-B Part Number 969424–02
Indicators
1 green power status indicator
Flexbus Current
40mA
Power Dissipation
3W maximum @ 31.2V dc
Thermal Dissipation
Maximum 10.2 BTU/hr @ 31.2V dc
Keyswitch Position
3
External dc Power
Supply Voltage
Voltage Range
Supply Current
24V dc nominal
19.2 to 31.2V dc (includes 5% ac ripple)
85mA @ 24V dc
General Specifications
Dimensions
Inches
(Millimeters)
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Shock
Operating
Non-operating
Vibration
Conductors
Thermocouple
Millivolt
Category
1.8H x 3.7W x 2.1D
(45.7 x 94.0 x 53.3)
0 to 55oC (32 to 131oF)
–40 to 85oC (–40 to 185oF)
5 to 95% noncondensing (operating)
5 to 80% noncondensing (nonoperating)
30 g peak acceleration, 11(+1)ms pulse width
50 g peak acceleration, 11(+1)ms pulse width
Tested 5 g @ 10–500Hz per IEC 68-2-6
Use appropriate shielded thermocouple wire1
Belden 8761
22
Agency Certification
(when product is marked)
• CSA certified
• CSA Class I, Division 2
Groups A, B, C, D certified
• UL listed
• CE marked for all applicable directives
User Manual
Publication 1794-6.5.12
1 Refer to thermocouple manufacturer for proper thermocouple extension.
2 Use this conductor category information for planning conductor routing. Refer to
publication 1770-4.1, “Industrial Automation Wiring and Grounding Guidelines for
Noise Immunity.”
Publication 1794-6.5.12 – November 1997
Index
Numbers
1794-TB3G wiring examples, 2–12
A
adapter input status word, 5–1
cold junction, calibration, 6–8
commands
EDT, 6–5
EDT command data, 6–5
communication
between module and adapter, 1–2
block transfers, 3–1
compatible terminal bases, 2–9
B
bit/word description
TC/RTD/mV analog module, 1794-IRT8,
4–4
TC/RTD/mV input module, 1794-IRT8,
5–5
configurable features, 4–1
connecting wiring, 2–9, 6–3
considerations, pre–installation, 2–1
curent draw, through base units, 2–2
current source, calibration, 6–8
bit/Word descriptions, 4–5
block transfer
configuration, 3–1
read, 1–1
write, 1–1, 3–1
block transfer programming
PLC-2 family processor, 3–2
PLC-3 family processor, 3–2
PLC-5 family processor, 3–3
PLC-5/250 processor, 3–4
block transfer read, 4–3
1794-IRT8, 4–3
DeviceNet, 5–4
block transfer write
1794-IRT8, 4–5
DeviceNet, 5–4
configuration block, 1794-IRT8, 4–5, 5–4
type and input range selection, 4–2
C
calibration
cold junction, 6–8
current source, 6–8
gain, 6–7
manual, 6–2
offset, 6–6
periodic, 6–1
preparation, 6–2
setups, 6–3
tools, 6–2
types of, 6–1
using resistors, 6–3
D
daisy–chaining wiring, 2–3
data mapping, 4–3, 5–3
default values, 5–11
DeviceNetManager, software, 5–1
DIN rail mounting, 2–4
drilling dimensions, wall/panel mounting,
2–7
E
example, 1794-TB3G wiring, 2–12
F
features
configurable, 4–1
of the module, 1–3
G
gain calibration, 6–7
I
I/O module fault, 5–2
indicators
states, 2–13
status, 2–13
calibration words, 6–4
input ranges, 4–2
CE compliance, 2–1
input status word, 5–2
Publication 1794-6.5.12 – November 1997
I–2
Index
inputs, 1–1
installation
module, 2–8
of the module, 2–4
K
keyswitch positions, 2–8
PLC-5/250 processor, block transfer
programming, 3–4
polled I/O, structure, 5–1
preparing for calibration, 6–2
R
range, selecting, 4–2
read/write words, for calibration, 6–4
L
low voltage directive, 2–2
removing and replacing, under power
(RIUP), 2–8
RTD analog input mapping, 1794-IR, 4–3
RTD wiring example, 2–12
M
manual calibration, 6–2
S
mapping
1794-IRT8, 4–3, 5–3
data, 5–3
sensor types, 4–2
mapping data, 4–3
specifications, A–1
module, shipping state, calibration, 6–1
status indicators, 2–13
module fault, 5–2
system throughput, 5–3
software, DeviceNetManager, 5–1
module features, 1–3
module installation, 2–4, 2–8
mounting, on terminal base, 2–8
mounting kit, cat. no. 1794-NM1, 2–6
O
offset calibration, 6–6
optimal defaults, 5–11
P
panel/wall mounting, 2–6
PLC-2 family processor, block transfer
programming, 3–2
PLC-3 family processor, block transfer
programming, 3–2
PLC-5 family processor, block transfer
programming, 3–3
Publication 1794-6.5.12 – November 1997
T
TC/RTD/mV input mapping, 1794-IRT8, 5–3
TC/RTD/mV input module, specifications,
A–1
terminal bases, compatible, 2–9
thermocouple wiring example, 2–12
tools, calibration, 6–2
W
wall/panel mounting, 2–6
wiring
connections, 6–3
methods of, 2–3
wiring connections, 2–9
1794-IRT8, 2–11, 6–3
Allen-Bradley
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Thermocouple/RTD Module User Manual
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1794-IRT8
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1794-6.5.12
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Publication 1794-6.5.12 – November 1997
Allen-Bradley, a Rockwell Automation Business, has been helping its customers improve
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Publication 1794-6.5.12 – November 1997
PN 955128–51
Copyright 1997 Allen-Bradley Company, Inc. Printed in USA
Publication 1794-6.5.12 – November 1997
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