Allen-Bradley 1771-IXHR User manual

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High Resolution
Thermocouple/Millivolt Input Module
Cat. No. 1771-IXHR
User Manual
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1

1991 Allen-Bradley Company , Inc.
PLC is a registered trademark of Allen-Bradley Company , Inc.
Because of the variety of uses for this product and because of the
differences between solid state products and electromechanical products,
those responsible for applying and using this product must satisfy
themselves as to the acceptability of each application and use of this
product. For more information, refer to publication SGI–1.1 (Safety
Guidelines For The Application, Installation and Maintenance of Solid
State Control).
The illustrations, charts, and layout examples shown in this manual are
intended solely to illustrate the text of this manual. Because of the many
variables and requirements associated with any particular installation,
Allen–Bradley Company cannot assume responsibility or liability for
actual use based upon the illustrative uses and applications.
No patent liability is assumed by Allen–Bradley Company with respect to
use of information, circuits, equipment or software described in this text.
Reproduction of the contents of this manual, in whole or in part, without
written permission of the Allen–Bradley Company is prohibited.
Throughout this manual we make notes to alert you to possible injury to
people or damage to equipment under specific circumstances.
WARNING: Tells readers where people may be hurt if
procedures are not followed properly.
CAUTION: Tells readers where machinery may be damaged
or economic loss can occur if procedures are not followed
properly.
Warnings and Cautions:
- Identify a possible trouble spot.
- Tell what causes the trouble.
- Give the result of improper action.
- Tell the reader how to avoid trouble.
Important: We recommend you frequently backup your application
programs on appropriate storage medium to avoid possible data loss.
Important User Information
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Important User Information 1. . . . . . . . . . . . . . . . . . . . . . . .
Using This Manual 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purpose of Manual 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audience 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vocabulary 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Organization 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings and Cautions 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Products 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product
Compatibility 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related
Publications 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview of the High Resolution Thermocouple/Millivolt
Input Module 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Description 21
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features
of the Input Module 21. . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Analog Modules Communicate with Programmable Controllers 22
Accuracy 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Getting Started 23
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 23
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the High Resolution Thermocouple/Millivolt
Input Module 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before Y
ou Install Y our Input Module 31. . . . . . . . . . . . . . . . . . . . . .
Electrostatic Damage 31
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Requirements 31
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module
Location in the I/O Chassis 32. . . . . . . . . . . . . . . . . . . . . . .
Module Keying 32
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Wiring 33
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grounding
the Input Modules 34. . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing
the Input Module 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interpreting the Indicator Lights 36
. . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 37
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
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Table of Contentsii
Module Programming 41. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Transfer Programming 41
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-2
Applications 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-3 Program Example 42
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-5 Program Example 44
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Scan Time 45
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 45
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Configuration 51. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring the Module 51
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Type 52
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zoom Feature 52
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Scale 52
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Real T
ime Sampling 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Channel Alarms 53
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration 53
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Block for a Block Transfer Write 54
. . . . . . . . . . . . . . .
Bit/Word Descriptions 56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 58
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Status and Input Data 61. . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading Data from the Module 61
. . . . . . . . . . . . . . . . . . . . . . . . . .
Bit/Word Descriptions 62
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 63
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Calibration 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objective 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tools and Equipment 71
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibrating your Input Module 71
. . . . . . . . . . . . . . . . . . . . . . . . . . .
About Auto-calibration 71
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performing Auto-calibration 72
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performing
Manual Calibration 75. . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 79
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Table of Contents iii
Troubleshooting 81. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objective 81. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostics Reported by the Module 81
. . . . . . . . . . . . . . . . . . . . . .
Troubleshooting
with the Indicators 82. . . . . . . . . . . . . . . . . . . . . . .
Status Reported by the Module 82
. . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 84
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Resolution Thermocouple/Millivolt Input Module Accuracy A-2. . .
Lead Resistance Compensation A-3
. . . . . . . . . . . . . . . . . . . . . . . . .
Filtering A-3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming Examples B1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Sample Programs for the Input Module B1. . . . . . . . . . . . . . . . . . . .
PLC-3 Family Processors B1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-5 Family Processors B2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermocouple Restrictions
(Extracted from NBS Monograph 125 (IPTS-68)) C1. . . . .
General C1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Chapter
11
Using This Manual
This manual shows you how to use your High Resolution
Thermocouple/Millivolt input module with an Allen–Bradley programmable
controller. It helps you install, program, calibrate, and troubleshoot your
module.
You must be able to program and operate an Allen–Bradley programmable
controller (PLC) to make efficient use of your input module. In particular, you
must know how to program block transfer instructions.
We assume that you know how to do this in this manual. If you do not, refer to
the appropriate PLC programming and operations manual before you attempt to
program this module.
In this manual, we refer to:
The individual input module as the “input module” or the ”IXHR”
The Programmable Controller, as the “controller.”
This manual is divided into eight chapters. The following chart shows each
chapter with its corresponding title and a brief overview of the topics covered in
that chapter.
Chapter Title Topics Covered
2Overview of the Input Module Description of the module, including general and hardware
features
3Installing the Input Module Module power requirements, keying, chassis location
Wiring of field wiring arm
4Module Programming How to program your programmable controller for this module
Sample programs
5Module Configuration Hardware and software configuration
Module write block format
6Module Status and Input Data Reading data from your module
Module read block format
7Module Calibration How to calibrate your module
8 Troubleshooting Diagnostics reported by the module
Purpose of Manual
Audience
Vocabulary
Manual Organization
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Using This Manual
Chapter 1
12
Chapter Topics CoveredTitle
Appendix A Specifications Your module's specifications
Appendix B Programming Examples
Appendix C Thermocouple Characteristics Extractions from NBS Monograph 125 (IPTS-68)
This manual contains warnings and cautions.
WARNING: A warning indicates where you may be injured if you
use your equipment improperly.
CAUTION: Cautions indicate where equipment may be damaged
from misuse.
You should read and understand cautions and warnings before performing the
procedures they precede.
You can install your input module in any system that uses Allen–Bradley
PLC–3 and PLC–5 programmable controllers with block transfer capability and
the 1771 I/O structure.
Contact your nearest Allen–Bradley office for more information about your
programmable controllers.
These input modules can be used with any 1771 I/O chassis. Communication
between the analog module and the processor is bidirectional. The processor
block–transfers output data through the output image table to the module and
block–transfers input data from the module through the input image table. The
module also requires an area in the data table to store the read block and write
block data. I/O image table use is an important factor in module placement and
addressing selection. The module’s data table use is listed in the following table.
Warnings and Cautions
Related Products
Product Compatibility
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Using This Manual
Chapter 1
13
Table 1.A
Compatibility
and Use of Data T able
Catalog
Number
Use of Data T able
Input Output Read Write
Image Image Block Block
Bits Bits Words Words
Compatibility
Addressing Chassis
1/2 -slot 1-slot 2-slot Series
1771-IXHR 8 8 12/13 27/28 Yes Yes Yes A and B
A = Compatible with 1771-A1, A2, A4 chassis.
B = Compatible with 1771-A1B, A2B, A3B, A4B chassis.
Y es = Compatible without restriction
No = Restricted to complementary module placement
You can place your input module in any I/O module slot of the I/O chassis. You
can put:
two input modules in the same module group
an input and an output module in the same module group.
Do not put the module in the same module group as a discrete high density
module unless you are using 1 or 1/2 slot addressing. Avoid placing this module
close to AC modules or high voltage DC modules.
For a list of publications with information on Allen–Bradley programmable
controller products, consult our publication index SD499.
Related Publications
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Chapter 2
2
Chapter
21
Overview of the High Resolution
Thermocouple/Millivolt Input Module
This chapter gives you information on:
features of the input module
how an input module communicates with programmable controllers
The High Resolution Thermocouple/Millivolt input module is an intelligent
block transfer module that interfaces analog input signals with any
Allen–Bradley programmable controllers that have block transfer capability.
Note: Use with PLC–2 family programmable controllers is not recommended.
The 1771–IXHR module is only available with 2’s complementary binary as its
only data type. The PLC–2 family does not use 2’s complementary binary.
Block transfer programming moves input data words from the module’s
memory to a designated area in the processor data table in a single scan. It also
moves configuration words from the processor data table to module memory.
The input module is a single slot module which does not require an external
power supply. After scanning the analog inputs, the input data is converted to a
specified data type in a digital format to be transferred to the processor’s data
table on request. The block transfer mode is disabled until this input scan is
complete. Consequently, the minimum interval between block transfer reads is
the same as the total input update time for each analog input module (25ms).
The 1771–IXHR module senses up to 8 differential analog inputs and converts
them to values compatible with Allen–Bradley programmable controllers.
This module’s features include:
8 input channels configurable for thermocouple input ranges or millivolt
input ranges: Types B, E, J, K, T, R and S thermocouples and +100 millivolts
two types of inputs allowed: 4 of one input type and 4 of another
cold junction compensation
scaling to selected temperature range in oC or oF
temperature resolution of 0.1oC or 0.1oF, millivolt resolution to 1 microvolt
user selectable high and low temperature alarms
all features selectable through programming
Chapter Objectives
Module Description
Features of the Input Module
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