Because of the variety of uses for the products described in this
publication, those responsible for the application and use of this
control equipment must satisfy themselves that all necessary steps
have been taken to assure that each application and use meets all
performance and safety requirements, including any applicable laws,
regulations, codes and standards.
The illustrations, charts, sample programs and layout examples shown
in this guide are intended solely for purposes of example. Since there
are many variables and requirements associated with any particular
installation, Allen-Bradley does not assume responsibility or liability
(to include intellectual property liability) for actual use based upon
the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the
Application, Installation and Maintenance of Solid-State Control
(available from your local Allen-Bradley office), describes some
important differences between solid-state equipment and
electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in whole
or part, without written permission of Rockwell Automation, is
prohibited.
Throughout this manual we use notes to make you aware of safety
considerations:
ATTENTION
Identifies information about practices or
circumstances that can lead to personal injury or
death, property damage or economic loss
!
Attention statements help you to:
• identify a hazard
• avoid a hazard
• recognize the consequences
IMPORTANT
Allen-Bradley, FLEX Ex, FLEX I/O, and ControlNet Ex are trademarks of Rockwell Automation
ControlNet is a trademark of ControlNet International
Identifies information that is critical for successful
application and understanding of the product.
Using This Manual
Preface
Why Read this Manual
Who Should Read this
Manual
About the Vocabulary
What this Manual
Contains
This manual shows you how to use your FLEX Ex thermocouple/
RTD/mV module with the ControlNet Ex
network. The manual helps you install, program, and troubleshoot
your module.
You must be able to program and operate a ControlNet Ex product
and ControlNet
In this manual, we refer to the:
1797-IRT8 as the “input module”. or “module.”
•
The following chart lists each chapter with its corresponding title and
a brief overview of the topics covered in that chapter.
ChapterTitleContents
1About the FLEX Ex Analog ModulesDescribes features, capabilities,
2Understanding Configurable FLEX Ex
network to make efficient use of a FLEX Ex module.
thermocouple/RTD/mV Input Module
Features
products and ControlNet
and hardware components
Describes configurable features of
the input module
3How to Install Your Thermocouple/
RTD/mV Module
4Input, Output and Configuration Files
for the hermocouple/RTD/mV Module
on the ControlNet network
5Calibrating Your ModuleLists the tools needed, and the
6Applying FLEX Ex Analog ModulesLearn how to evaluate, define,
7Troubleshooting Your ModuleHow to use the indicators to
Appendix TitleContents
ASpecificationsOutlines module specifications and
BProgramming the FLEX Ex Analog
Module using RIO
3Publication 1797-6.5.2 - February 2001
How to install and wire the module
Describes communication over the
I/O backplane between the module
and the adapter, and how data is
mapped into the image table
methods used to calibrate the
module
select, match and optimize your
system.
troubleshoot your module
accuracy
Shows ladder diagramming for
programming.
Using This Manual 4
For Additional
Information
For additional information on FLEX Ex systems and modules, refer to
the following docum en ts ,
Catalog
Number
1797 SeriesFLEX Ex Product Data1797-2.1
1797 SeriesFLEX Ex System Overview1797-2.2
1797 SeriesControlNet Ex System Cable Guide1797-6.2.1
1797 SeriesFLEX Ex System Certification
Reference Manual
1797-TB3FLEX Ex Terminal Base1797-5.1
1797-TB3SFLEX Ex Spring Clamp Terminal Base1797-5.2
1797-OE8FLEX Ex 8 Output Analog Module1797-5.31797-6.5.1
1797-IRT8FLEX Ex RTD/Thermocouple/mV
Module
1797-IE8FLEX Ex 8 Input Analog Module1797-5.51797-6.5.1
Description
Publications
Installation
Instructions
(Product data)
(System
overview)
(System guide)
1797-6.2.6
1797-5.41797-6.5.2
User
Manual
1797-IE8NFFLEX Ex 8 Input Analog Module w/
Noise Filter
1797-OB4D4 Output Module1797-5.6
1797-IBN16FLEX Ex NAMUR Digital Input Module 1797-5.7
1797-IJ22 Frequency Input Module1797-5.91797-6.5.4
1797-PS2N
-CEFTE
1797-EXMKMarker Kit1797-5.23
1797FLEX Ex System Certification1797-6.5.6
FLEX Ex Power Supplies1797-5.12
FLEX Ex Taps1797-5.181797-6.2.1
Interconnect Cables1797-5.20
1797-5.311797-6.5.1
In Summary
Publication 1797-6.5.2 - Febr uary 2001
This preface gave you information on how to use this manual
efficiently. The next chapter introduces you to the 1797-IRT8
Thermocouple/RTD / mV Inpu t module .
Preface
Using This Manual
Table of Contents
About the FLEX Ex Thermocouple/
RTD/mV Input Module
About the FLEX Ex Thermocouple/RTD/mV
Input Module
1
What this Chapter
Contains
What the FLEX Ex
Thermocouple/RTD/mV
Modules Do
Read this chapter to familiarize yourself with the 1797-IRT8 input
module.
For information on:See page:
What the FLEX Ex Thermocouple/
RTD/mV Modules Do
How FLEX Ex Thermocouple/RTD/mV
Modules Communicate with
Programmable Controllers
Features of Your Module1-2
Chapter Summary1-5
The 1797-IRT8 module accepts up to 8 thermocouple, RTD or mV
inputs. The inputs are nonisolated and are selected with analog
multiplexers which have a common-mode input range of -0.5 to +3.6
volts. The inputs will accept a millivolt or resistive input. Default input
spans are –40.00mV to +100.00mV or 0.00 to 500.00 ohms. Fault
Indicators are located on the field side.
No switches or jumpers are us ed on t he th ermocouple/RTD/mV input
module. The Inputs have both fixed hardware filters and selectable
firmware digital filters.
1-1
1-2
This module offers:
• local microprocessor intelligence for advanced features
• full functionality without switches or jumpers
• multiple data ranges that can be independently programmed in
channel groups
• lead breakage detection
• overrange/underrange alarms
as well as a host of other module features.
1Publication 1797-6.5.2 - February 2001
1-2 About the FLEX Ex Thermocouple/RTD/mV Input Module
How FLEX Ex
Thermocouple/RTD/mV
Modules
Communicate with
Programmable
Controllers
FLEX Ex thermocouple/RTD/mV modules provide best utility when
used with ControlNet Ex products on the Co ntrolNet network. Data
connections are established between the I/O module and an
Allen-Bradley programmable controller to transfer information
between the two at a scheduled rate.
Input module information is then automatically made available in the
PLC data table.
When the data connection is established, configuration information
for the module is automatically transferred to it via the network.
Events following Power-Up
You must apply intrinsically safe +/-V power to your FLEX Ex I/O
modules. The following sequence of events occurs after power has
initially been applied to your module:
1. The module begins an interal diagnostic check. The channel 0 LED
indicator turns ON to indicate the check has begun. The indicator
turns OFF when th e che ck is finish ed.
Features of Your Module
2. After the diagnostic check, module configuration information,
selected by the user and downloaded over the network, is applied
by the module.
For more information on configuration options, see Chapter 2.
3. Following the module configuration download for the 1797-IRT8
module, the module begins producing runtime data for the PLC.
4. If any diagnostics or alarms are generated during normal module
operation, the data is returned to the PLC.
The module label identifies the keyswitch position, wiring and
module type. Use the removable label to note individual designations
per your application.
Publication 1797-6.5.2 - Febr uary 2001
About the FLEX Ex Thermocouple/RTD/mV Input Module 1-3
Indicators
Indicators are provided to identify input or output fault conditions,
and to show when power is applied to the module.
1797-IRT8
Module Type
Using Alarms on the
1797-IRT8 Module
Removable Label
Keyswitch Position
Indicator (#2)
Power On Indicator
40070
Input Designato rs
1797-IRT8
Ex
PWR
The 1797-IRT8 FLEX Ex module is capable of generating four alarms:
Underrange
•
Overrange
•
Fault (open wire)
•
Cold junction compensation Fault
•
These alarm conditions are described in general terms and as they
relate to bits on the FLEX Ex I/O module on the following pages. The
graphic below shows at what values these alarms are generated for
Data Format 4.
Publication 1797-6.5.2 - February 2001
1-4 About the FLEX Ex Thermocouple/RTD/mV Input Module
Data Format Alarm Example
In this example, the normal active data range is 4-20mA. The alarms
are generated in three overlapping bands.
PHYSICAL INPUT SIGNAL RANGE
CJC fault
underrange
overrange
CJC fault
Maximum
Measureable
Value
open w i re fault
Channel Data
Forced to
Maximum for Type
Minumum
Value for
Sensor
Type
normal signal range
Maximum
Value for
Sensor
Type
Overrange
If the input is greater than the maximum temperature of the
thermocouple or RTD range, millivolt (+100mV), or resistance (500W)
the overrange bit for that channel will be set.
Underrange
If the input is less than the minimum temperature of the thermocouple
or RTD range, millivolt (-40mV), or resistance (0W) the underrange bit
for that channel will be set.
Publication 1797-6.5.2 - Febr uary 2001
Open Wire
Individual channel fault alarm for broken wire. If a broken wire/
detached lead is detected, the data value is forced to maximum. In
RTD/W mode, input levels above 540W will set this bit; in
thermocouple/mV mode, input levels above 210mV will set this bit.
Cold Junction Compensation Alarm
Broken or detached lead or shorted lead detection is included for
CJCs. This detection is only available when the input type selected is
thermocouple and sensor mode is set to CJC compensation.
When either CJC fails its fault is reported. Both CJCs ae normally used
in compensation calculations. If one CJC fails, calculations use the
remaining good device. If both fail, calculations use the last good
value.
About the FLEX Ex Thermocouple/RTD/mV Input Module 1-5
Data Formats and Fault Modes
The tables below shows the bit settings for the data formats and fault
modes for your FLEX Ex thermocouple/RTD/mV module.
Data Formats
Bit 111009 08Data type for channels 0 thru 7
0000
0001
0010
0011-32767 to +32767
01000 to 65535
0101 thru 1111 not used
Note: Module defaults to -4000 to 10,000 in millivolt mode, and 0 to 5000 in ohms mode
o
C (see note)
o
F (see note)
o
K (see note)
Chapter Summary
Fault Mode
Bit 06Fault enable for channels 0-3
07Fault enable for channels 4-7
0 = disabled
1 = enable wire-off detection
In this chapter, we told you about the FLEX Ex system and the
thermocouple/RTD/mV module, and how it communicates with
programmable controllers.
Publication 1797-6.5.2 - February 2001
1-6 About the FLEX Ex Thermocouple/RTD/mV Input Module
Publication 1797-6.5.2 - Febr uary 2001
Understanding Configurable FLEX Ex
Thermocouple/RTD/mV Input
Module Features
Chapter
2
What this Chapter
Contains
Read this chapter to familiarize yourself with configurable features on
the 1797-IRT8 module.
For information on:See page:
Setting a FLEX Ex Thermocouple/RTD
Module’s Operating Status
Input Type Select2-2
Sensor Type Select2-2
Data Format2-4
Preset Temperature Select2-5
RTD Loop Resistance Offset Select2-6
Fault Mode Select2-7
Important:You must use your programming software to configure
these features. A brief description of each module feature
is provided in this chapter, but you must use the online
help included with your programming software to perform
specific configuration.
1Publication 1797-6.5.2 - February 2001
2-2 Understanding Configurable FLEX Ex Thermocou ple/RTD/mV Input Module Features
Setting a FLEX Ex
Thermocouple/RTD
Module’s Operating
Status
Input Type Select
Select the thermocouple or RTD mode for input channel groups 0-3
and 4-7. If 2 is selected, the module defaults to thermocouple. If 3 is
selected, the module defaults to RTD.
Range: 0 = thermocouple, 1 = RTD, 2 and 3 not used
Bits 06-07Input Type Select
Bit0706Input type sel ect ion for channels 0-3
00Thermocouple
01RTD
10
11
Input type select for channels 4 through 7 use bits in word 1.
Not used
Sensor Type Select
Select the type of sensor for input channel groups 0-3 and 4-7.
Thermocouple mode 0 = mV, 1 = B, 2 = E, 3 = J, 4 = K, 5 = TXK/
Amendment 2, 3 = Pt1 00 JIS C1604-1989, 4 = Pt200 JIS C1604- 1989, 5 =
Ni100 DIN 43760-1987, 6 = Ni200 DIN 4376 0-1987, 7 = Ni120 Min co, 8
= Cu10 Minco, 9-15 not used.
If unused settings are chosen, diagnostic status “2 = configuration
failure” will be set, and the last valid configuration will be used. The
default = 0.
Publication 1797-6.5.2 - Febr uary 2001
Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features 2-3
Bits 00-03Sensor Type (Thermocouple or RTD)
RTD Type
Bit03020100Sensor type for channels 0 through 3
0000Resistance (default)
0001100 ohm Pt α = 0.00385 Euro (–200 to +870°C)
0010200 ohm Pt α = 0.00385 Euro (–200 to +400°C)
0011100 ohm Pt α = 0.003916 U.S. (–200 to +630°C)
0100200 ohm Pt α = 0.003916 U.S. (–200 to +400°C)
0101100 ohm Nickel (–60 to +250°C)
0110200 ohm Nickel (–60 to +200°C)
0111120 ohm Nickel (–80 to +320°C)
100010 ohm Copper (–200 to +260°C)
1001 through 1111 not used
Bits 00-03Thermocouple Type
Bit03020100Sensor type for channels 0 through 3
0000mV (default)
0001B 300 to 1800°C(572 to 3272°F)
0010E –250 to 1000°C(–418 to 1832°F)
0011J –210 to 1200°C(–346 to 2192°F)
0100K –250 to 1372°C(–418 to 2502°F)
0101L –200 to 800°C(–328 to 1472°F)
0110N –250 to 1300°C(–418 to 2372°F)
0111R –0 to 1768°C(32 to 3214°F)
1000S –0 to 1768°C(32 to 3214°F)
1001T –250 to 400°C(–418 to 752°F)
1010 through 1111 not used
Input Filter Cutoff
A series of eight available input filters – filters are hardware and
software – allow you to choose the best rolloff frequency for input
channels on your I/O module. When choosing a filter, remember that
time frequency rolloff may affect your input signal’s accuracy.
For example, in configuration word 0, if you choose the fastest time
frequency of 600Hz (hardware filter only), little noise is added, but the
slowest frequency of 0.2Hz will provide the most accurate process
noise filtering. See below to decide which input filter to use in your
application:
Publication 1797-6.5.2 - February 2001
2-4 Understanding Configurable FLEX Ex Thermocou ple/RTD/mV Input Module Features
Choose the best input filter cutoff in your programming software.
Data Format
You must choose a module data format in your user program. Select
the format by setting bits as shown below. Note that this parameter
affects channel accuracy.
Data format – module defaults to –4000 to 10000 in millivolt mode, and 0 to 5000 in ohms mode
Bit11100908Data type for channels 0-7
0000°C
0001°F
0010×K
0011–32767 to +32767
01000 to 65535
0101 through 1111 not used
o
C, oF and oK will have formats appropriate to the selected
thermocouple or RTD range (e.g. -xxxx to +xxxx with 1 decimal place
implied - 3500 = 350.0). For Cu10 RTD, 2 decimal points are implied.
If using mV, data format defaults to -4000 to +10000 (2 decimal points
implied (e.g. -40 to 100.00). If using W mode selection, data format
defaults to 0 to 5000 (1 decimal point implied, e.g. 0.- to 500.0).
In the thermocouple and RTD modes, if unused data formats are
o
chosen, the module will default to
C.
Publication 1797-6.5.2 - Febr uary 2001
Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features 2-5
Sensor Mode Select
Selects the sensor mode for input channels 0-3 and 4-7.
If using cold junction compensation, both CJCs must be installed. The
difference between the CJCs will be linearly apportioned to each
thermocouple channel based on its position across the base. If one
CJC is broken or missing, the remaining CJC is used t o compensate all
channels. The appropriate CJC alarm will be set in this case. If the
second CJC fails, the last valid reading is frozen for compensation use.
The second CJC alarm will also be set.
When using only channels 0-3 for thermocouples, connect the CJCs to
terminals 5 and 12. If only using channels 4-7, connect the CJCs to
terminals 22 and 29. If all channels are configured for thermocouples,
connect the CJCs to terminals 5 and 29.
When CJC thermistor temperature compensation is sele cted for one
channel group, all channels configured for thermocouple inputs will
use the CJC compensation.
0504Sensor mode for channels 0 thru 3
Bit
1312Sensor mode for channels 4 thru 7
Thermocoupl e Mode
00
01Internal compensation - Uses the value selected for reference junction
10
11Differential measurement between 2 channels
002-wire RTD - no compensation
012-wire RTD with user compensation
103-wire RTD
114-wire RTD
This parameter is used if Input Type Select is set to thermocouple and
Sensor Mode Select is set to fixed compensation. This parameter then
sets a fixed reference temperature used to compensate all
thermocouple channels.
The default = 0.
Publication 1797-6.5.2 - February 2001
2-6 Understanding Configurable FLEX Ex Thermocou ple/RTD/mV Input Module Features
Bits 03-05Reference Junction – used when input type is set to thermocouple and sensor
mode is set to fixed compensation. Sets a fixed reference junction to compensate
all thermocouple channels.
This parameter is used if Input Type Select is set to RTD and Sensor
Mode Select is set to 2-wire with loop resistance compensation. This
parameter then sets total RTD loop resistance compensation for each
RTD channel. Either the value stored for each channel during
calibration is used to compensate the module RTD channels, or one of
3 fixed values is used to compensate module RTD channels.
This parameter is disabled for Cu10 RTDs.
00-15 (00-17)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 10W copper RTD, which defaults to
0W.
Bits 06-07Fault Mode bits – when a bit is set (1), fault mode is enabled for that channel.
Bit 06 corresponds to channels 0-3; bi t 07 corresponds to channels 4-7.
0 = disabled
1 = enable wire-off detection
FLEX Ex I/O modules are capable of generating four alarms:
Overrange
•
Underrange
•
Fault
•
Cold Junction Compensation (CJC) Fault
•
These alarm conditions are described in general terms and as they
relate to bits on the FL EX Ex I/O module on the following pages.
Overrange Alarm
The channel overrange alarm is set if the input is greater than the
maximum temperature (thermocouple or RTD range dependent),
millivolt (+100mV) or resistance (500Ω) range value.
Range: 0 = normal, 1 = input overrange. Default = 0.
This alarm stays active at any value above 100% of range and is
always enabled by the module. Refer to the figure below for the
sensor dependent signal which causes this alarm to be generated.
Publication 1797-6.5.2 - February 2001
2-8 Understanding Configurable FLEX Ex Thermocou ple/RTD/mV Input Module Features
The channel underrange alarm is set if the input is less than the
minimum temperature (thermocouple or RTD range dependent),
millivolt (-40mV) or resistance (0Ω) range value.
Range: 0 = normal, 1 = input overrange. Default = 0.
This alarm stays active at any value below 0% of range and is always
enabled by the module.
Range: 0 = normal, 1 = input overrange. Default = 0.
Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features 2-9
Fault Alarm
The module has individual channel fault alarms for a broken or
detached wire. In any mode, if a broken/detached lead is detected,
the data value is forced to maximum. Once the alarm is issued, it
remains active as long as the input signal is faulted.
In mV mode, for input levels above 210mV, this bit is set.
In RTD mode, an open input will set this bit.
Range: 0 = normal,1 = wire off, excessive input fault detected.
Default = 0.
Chapter Summary
In this chapter , we told you about the F LEX Ex sys tem and the analog
I/O modules, and how they communicate with programmable
controllers.
Publication 1797-6.5.2 - February 2001
2-10 Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features
Publication 1797-6.5.2 - Febr uary 2001
Chapter
How to Install Your FLEX Ex Thermocouple/
RTD/mV Module
3
What this Chapter Contains
Before You Install Your
Analog Module
Read this chapter to install the 1797-IRT8 thermocouple/RTD/mV
module.
For information on:See page:
Before You Install Your Analog
Module
Compliance to European Union
Directives
Installation in Zone 13-2
Removal and Insertion Under Power3-3
Installing the Module3-3
Connecting Wiring to the FLEX Ex
Thermocouple/RTD/mV Module
Grounding the Module3-13
Chapter Summary3-13
Before installing your FLEX Ex analog module:
You need to:As described under:
Verify that the module will be installed in a
suitable metal enclosure
3-1
3-2
3-10
Installation in Zone 1, page 3-2
Position the keyswitch on the
terminal base
ATTENTION
These modules do not receive primary operational
power from the backplane. +/-V 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.
Installing the Module, page 3-8
!
1Publication 1797-6.5.2 - February 2001
3-2 How to Install Your FLEX Ex Thermocouple/RTD/mV Module
Compliance to European
Union Directives
If this product has the CE mark, it is approved for installation within
the European and EEA regions. It has been designed and tested to
meet the following directives.
EMC Directive
This product is tested to meet the Council Directive 89/336/EC
Electromagnetic Compatibility (EMC) by applying the following
standards, in whole or in part, documented in a technical construction
file:
EN 50081-2 EMC - Generic Emission Standard, Part 2 - Industrial
•
Environment
EN 50082-2 EMC - Generic Immunity Standard, Part 2 - Industrial
•
Environment
This product is intended for use in an industrial environment.
Ex Directive
Installation in Zone 1
This product is tested to meet the Council Directive 94/9/EC (ATEX
100a) Equipment and Protective Systems Intended for Use in
Potentially Explosive Atmospheres by applying the following
standards:
EN50014:1992, Electrical Apparatus for Potentially Explosive
•
Atmospheres
EN50020:1994, Electrical Apparatus for Potentially Explosive
•
Atmospheres - Intrinsic Safety “i”
prEN50284:1997, Special requirements for construction, test and
•
marking of electrical apparatus of equipment group II, category
1G
This module must not be exposed to the environment. Provide a
suitable metal enclosure.
ATTENTION
This module cannot be used in an
intrinsically safe environment after it has
been exposed to non-intrinsically safe
signals.
Publication 1797-6.5.2 - Febr uary 2001
!
Loading...
+ 58 hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.