Allen-Bradley 1794-IT8 Bedienungsanleitung

User

Manual

Thermocouple/

Millivolt Input

Module

(Cat. No. 1794-IT8)

Allen-Bradley

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.

Important User Information



Publication

1794-6.5.7 – April 1997



The information below summarizes the changes to the

company-wide templates since the last release.

The following new information has been added to this manual:

•the “L” type thermocouple selection has been added for use in

some European markets.

Calibration procedures have been revised to eliminate 1 method in

order to better control calibration results.

Change Bars

The areas in this manual which are different from previous editions

are marked with change bars (as shown to the right of this paragraph)

to indicate the addition of new or revised information.

New Information

Updated Information

soc–ii Summary of Changes

Publication

1794-6.5.7 – April 1997

Publication

1794-6.5.7

Chapter 1

Chapter Objectives

1–1

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

The FLEX I/O System

1–1

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

How

FLEX I/O Analog Modules Communicate with Programmable

Controllers

1–1

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

Typical

Communication Between an Adapter and a Module

1–2

. . .

Features

of your Modules

1–3

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

Chapter Summary

1–3

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

Chapter 2

2–1

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

Before Y

ou Install Y

our Input Module

2–1

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

European

Union Directive Compliance

2–1

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

EMC Directive

2–1

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

Low V

oltage Directive

2–2

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

Power Requirements

2–2

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

Wiring

the T

erminal Base Units (1794-TB2 and -TB3 shown)

2–3

. .

Installing

the Module

2–4

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

Connecting

Wiring for the Thermocouple/mV Module

2–5

. . . . . . . . . . .

Example

of Millivolt Input Wiring to a 1794-TB3

erminal Base Unit

2–7

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

Example

3-wire Thermocouple Wiring to a 1794-TB3T

emperature T

erminal Base Unit

2–7

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

Module

Indicators

2–8

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

Chapter Summary

2–8

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

Chapter 3

Chapter Objectives

3–1

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

Block

ransfer Programming

3–1

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

Sample

programs for FLEX I/O Analog Modules

3–2

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

PLC-3 Programming

3–2

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

PLC-5 Programming

3–3

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

PLC-2 Programming

3–4

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

Chapter Summary

3–4

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

Overview of Flex I/O and

your Thermocouple/mV

Module

How to Install Your

Thermocouple/mV Input

Module

Module Programming

Table of Contents

Table of Contentsii

Publication

1794-6.5.7

Chapter 4

Chapter Objectives

4–1

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

ConfiguringY

our Thermocouple/mV Module

4–1

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

Range

Selection

4–2

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

Input

Scaling

4–2

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

Hardware

First Notch Filter

4–3

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

Throughput

in Normal Mode

4–3

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

Reading Data From Y

our Module

4–4

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

Mapping

Data for the Analog Modules

4–4

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

Thermocouple/mV

Input Module (1794-IT8) Image T

able Mapping

4–4

Thermocouple/mV Input Module (1794-IT8) Read

4–4

. . . . . . . . . .

Thermocouple/mV

Input Module (1794-IT8) W

rite

4–5

. . . . . . . . . .

Word/Bit

Descriptions for the 1794-IT8 Thermocouple/mV

Input Module

4–5

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

Chapter Summary

4–7

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

Chapter 5

Chapter Objectives

5–1

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

About DeviceNet Manager

5–1

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

Polled I/O Structure

5–1

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

Adapter

Input Status W

ord

5–2

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

System

Throughput

5–3

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

Mapping

Data into the Image T

able

5–3

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

Thermocouple/mV

Input Module (1794-IT8) Image T

able Mapping

5–3

Thermocouple/mV Input Module (1794-IT8) Read

5–3

. . . . . . . . . .

Thermocouple/mV

Input Module (1794-IT8) W

rite

5–4

. . . . . . . . . .

Word/Bit

Descriptions for the 1794-IT8 Thermocouple/mV

Input Module

5–4

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

Defaults

5–7

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

Chapter 6

Chapter Objective

6–1

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

General

Information

6–1

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

Tools

and Equipment

6–2

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

Removing

Lead Wire or Thermocouple Extension Wire Resistance

6–2

Method

1 6–2

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

Method

2 6–3

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

Manually

Calibrating your Thermocouple/mV Input Module

6–4

. . . . . . .

Flow

Chart for Calibration Procedure

6–5

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

Calibration

Setups

6–6

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

Wiring

Connections for the Thermocouple Module

6–6

. . . . . . . . . . .

Read/Write W

ords for Calibration

6–7

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

Offset

Calibration

6–7

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

Gain

Calibration

6–8

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

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

Table of Contents iii

Publication

1794-6.5.7

CalibratingY

our Thermocouple/mV Module using DeviceNetManager

Software (Cat. No. 1787-MGR)

6–9

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

Offset

Calibration

6–9

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

Gain

Calibration

6–1

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix A

Specifications

A–1

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

Derating Curve

A–2

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

Resolution Curves for Thermocouples

A–3

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

Type

B Thermocouple

A–3

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

Type

E Thermocouple

A–3

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

Type

C Thermocouple

A–4

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

Type J Thermocouple

A–4

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

Type

K Thermocouple

A–5

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

Type

R Thermocouple

A–5

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

Type

S Thermocouple

A–6

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

Type

T Thermocouple

A–6

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

Type

N Thermocouple

A–7

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

Worst Case Accuracy for the Thermocouple/mV Module

A–7

. . . . . . .

Error

Due to Open Circuit Current Through Loop Resistance

A–8

. . . .

Worst

Case Repeatability for the Thermocouple/mV Input Module

A–8

Appendix B

General

B–1

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

(Platinum – 30% Rhodium vs Platinum – 6% Rhodium) T

ype

Thermocouples

B–1

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

E (Nickel–Chromium vs Copper–Nickel <Constantan*>) Type

Thermocouple

B–2

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

J (Iron vs Copper–Nickel <Constantan*>) T

ype Thermocouple

B–2

. . .

K (Nickel–Chromium vs Nickel–Aluminum) T

ype Thermocouple

B–4

. .

(Platinum–13% Rhodium vs Platinum) and

S (Platinum–10% Rhodium vs Platinum) T

ype Thermocouples

B–5

T (Copper vs Copper–Nickel <Constantan*>) T

ype Thermocouple

B–5

Specifications

Thermocouple Restrictions

(Extracted from NBS

Monograph 125 (IPTS–68))

Table of Contentsiv

Publication

1794-6.5.7

Preface

Publication

1794-6.5.7 – April 1997

Using This Manual

Read this preface to familiarize yourself with this manual and to

learn how to use it properly and efficiently.

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 you are using this module in a DeviceNet system, you

must be familiar with:

•DeviceNetManagerTM Software, cat. no. 1787-MGR

•Microsoft WindowsTM

In this manual, we refer to:

•the individual thermocouple/mV module as the “module.”

•the programmable controller as the “controller” or the

“processor.”

The contents of this manual are as follows:

Chapter Title What’s Covered

1Overview of Flex I/O and Your

Thermocouple/mV Module Describes features, capabilities, and hardware

components.

2How to Install Your

Thermocouple/mV Input Module Installation and connecting wiring

3Module Programming Block transfer programming and programming

examples

4Writing 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.

5How 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.

6Calibrating Your Module Lists the tools needed, and the methods used to

calibrate the thermocouple input module

Appendix

A Specifications Module specifications, derating curve, resolution curves

for thermocouples, worst case accuracy and error due

to open circuit current.

BThermocouple Restrictions Extracted from NBS Monograph 125 (IPTS–68)

Preface Objectives

Audience

Vocabulary

What This Manual

Contains

Using This ManualP–2

Publication

1794-6.5.7 – April 1997

We use these conventions in this manual:

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 More

For additional information on FLEX I/O systems and modules, refer

to the following documents:

Catalog

Descr pt on

Publications

Catalog

Number Description Installation

Instructions User

Manual

1787-MGR DeviceNetManager Software User Manual 1787-6.5.3

Industrial Automation Wiring and Grounding Guidelines 1770-4.1

1794 1794 FLEX I/O Product Data 1794-2.1

1794-ADN DeviceNet Adapter 1794-5.14 1794-6.5.5

1794-ASB/C Remote I/O Adapter 1794-5.46 1794-6.5.9

This preface gave you information on how to use this manual

efficiently. The next chapter introduces you to the remote I/O

adapter module.

Conventions

For Additional Information

Summary

Andere Handbücher für 1794-IT8

Inhaltsverzeichnis

Andere Allen-Bradley E/A-System Handbücher

Allen-Bradley

Allen-Bradley Compact 1769-IR6 Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1794-IB8 Bedienungsanleitung

Allen-Bradley

Allen-Bradley SLC 500 1746-FIO4I Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1794-IT8 Bedienungsanleitung

Allen-Bradley

Allen-Bradley MicroLogix 1200 Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1734-IB8S Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1762-IQ8OW6 Bedienungsanleitung

Allen-Bradley

Allen-Bradley ControlLogix Bedienungsanleitung

Allen-Bradley

Allen-Bradley SLC 500 Bedienungsanleitung

Allen-Bradley

Allen-Bradley SLC 500 Bedienungsanleitung

Allen-Bradley

Allen-Bradley ArmorBlock LP2 Bedienungsanleitung

Allen-Bradley

Allen-Bradley Rockwell Automation 1734-AENT Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1794-IM8 Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1397-L11 Bedienungsanleitung

Allen-Bradley

Allen-Bradley Compact 5000 Series Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1771-IB Installations- und Benutzerhandbuch

Allen-Bradley

Allen-Bradley ControlLogix 1756-IH16ISOE Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1775-S4A Bedienungsanleitung

Allen-Bradley

Allen-Bradley SLC 500 1746-NI4 Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1734-IB2 Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1756-IB16K Bedienungsanleitung

Allen-Bradley

Allen-Bradley 1769-IQ32 Service-Handbuch

Allen-Bradley

Allen-Bradley Series B Bedienungsanleitung

Allen-Bradley

Allen-Bradley FLEX I/O 1794-IR8 Bedienungsanleitung

Beliebte E/A-System Handbücher anderer Marken

WAGO

WAGO 750-344 Bedienungsanleitung

Teknim

Teknim TWM-1887 Bedienungsanleitung

Intelligent Appliance

Intelligent Appliance IA-2662-E Bedienungsanleitung

BERGHOF

BERGHOF ECC DIO 16/16 Bedienungsanleitung

Advantech

Advantech PCM-27J3AU Installations- und Betriebshandbuch

Festo

Festo CP-E08-M12-CL Bedienungsanleitung

Measurement Computing

Measurement Computing PCI-DAS64/M1/16 Bedienungsanleitung

Hitachi

Hitachi HX-RIO3 Series Bedienungsanleitung

NUUO

NUUO SCB-A08 Bedienungsanleitung

M-system

M-system R3Y-RS8 Bedienungsanleitung

jablotron

jablotron JB-110N Bedienungsanleitung

Omron

Omron SYSMAC C200H Bedienungsanleitung

DOLD

DOLD SAFEMASTER M Bedienungsanleitung

ABB

ABB OPT-MF-001 Bedienungsanleitung

Omron

Omron SYSMAC C2000H Bedienungsanleitung

Helmholz

Helmholz TB20 Bedienungsanleitung

ICP DAS USA

ICP DAS USA tM-AD2 Bedienungsanleitung

Automationdirect.com

Automationdirect.com DL305 Bedienungsanleitung