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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

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

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

= Compatible with 1771-A1, A2, A4 chassis.

B = Compatible with 1771-A1B, A2B, A3B, A4B chassis.

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

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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