Allen-Bradley SLC 500 User manual

SLC

™

500

4-Channel

Thermocouple/mV

Input Module

(Catalog Number 1746-NT4,

Series B)

User Manual

Important User Information

Solid state equipment has operational characteristics differing from those of

electromechanical equipment. Safety Guidelines for the Application,

Installation and Maintenance of Solid State Controls (Publication SGI-1.1

available from your local Rockwell Automation sales office or online at

http://www.ab.com/manuals/gi) describes some important differences

between solid state equipment and hard-wired electromechanical devices.

Because of this difference, and also because of the wide variety of uses for

solid state equipment, all persons responsible for applying this equipment

must satisfy themselves that each intended application of this equipment is

acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for

indirect or consequential damages resulting from the use or application of

this equipment.

The examples and diagrams in this manual are included solely for illustrative

purposes. Because of the many variables and requirements associated with

any particular installation, Rockwell Automation, Inc. cannot assume

responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to

use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without

written permission of Rockwell Automation, Inc. is prohibited.

Throughout this manual we use notes to make you aware of safety

considerations.

WARNING Identifies information about practices or circumstances

that can cause an explosion in a hazardous environment,

which may lead to personal injury or death, property

damage, or economic loss.

IMPORTANT Identifies information that is critical for successful

application and understanding of the product.

ATTENTION Identifies information about practices or circumstances

that can lead to personal injury or death, property

damage, or economic loss. Attentions help you:

•identify a hazard

•avoid a hazard

•recognize the consequence

SHOCK HAZARD Labels may be located on or inside the drive to alert

people that dangerous voltage may be present.

BURN HAZARD Labels may be located on or inside the drive to alert

people that surfaces may be dangerous temperatures.

Publication 1746-UM007C-EN-P - July 2004

Summary of Changes

The information below summarizes the changes to this manual since

the last printing.

To help you find new and updated information in this release of the

manual, we have included change bars as shown to the right of this

paragraph.

For information on: See page:

Changes to the SLC™ 500 Thermocouple/mV Input Module. throughout manual

Using RSLogix™ 500 to configure the NT4 module. 2-4, 5-2, 6-1, and Appendix

Maintaining the ambient temperature surrounding the SLC

500 above 3°C (37.4°F). A-2

Publication 1746-UM007C-EN-P - July 2004

2 Summary of Changes

iPublication 1746-UM007C-EN-P - July 2004

Table of Contents

Preface

Who Should Use this Manual. . . . . . . . . . . . . . . . . . . . . . . P-1

Purpose of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . P-2

Your Questions or Comments on this Manual . . . . . . . . P-3

Common Techniques Used in this Manual . . . . . . . . . . . . . P-3

Chapter 1

Overview

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

General Diagnostic Features. . . . . . . . . . . . . . . . . . . . . 1-3

System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Module Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Thermocouple Compatibility . . . . . . . . . . . . . . . . . . . . 1-5

Linear Millivolt Device Compatibility. . . . . . . . . . . . . . . 1-7

Chapter 2

Quick Start for Experienced Users

Required Tools and Equipment . . . . . . . . . . . . . . . . . . . . . 2-1

Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Chapter 3

Installation and Wiring

Compliance to European Union Directives . . . . . . . . . . . . . 3-1

EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Electrostatic Discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

NT4 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Module Location in Chassis . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Fixed Expansion Chassis Considerations . . . . . . . . . . . . 3-3

General Considerations . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Module Installation and Removal. . . . . . . . . . . . . . . . . . . . 3-5

Terminal Block Removal . . . . . . . . . . . . . . . . . . . . . . . 3-6

Module Installation Procedure . . . . . . . . . . . . . . . . . . . 3-6

Module Removal Procedure . . . . . . . . . . . . . . . . . . . . . 3-7

Terminal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Wiring Considerations . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Wiring Input Devices to the NT4 . . . . . . . . . . . . . . . . . 3-11

Cold Junction Compensation (CJC) . . . . . . . . . . . . . . . . 3-12

Thermocouple Calibration . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Chapter 4

Preliminary Operating

Considerations

Module ID Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Output Image-Configuration Words . . . . . . . . . . . . . . . 4-2

Input Image-Data Words and Status Words . . . . . . . . . . 4-3

Channel Filter Frequency Selection . . . . . . . . . . . . . . . . . . 4-4

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Table of Contents ii

Effective Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Channel Cut-Off Frequency . . . . . . . . . . . . . . . . . . . . . 4-5

Channel Step Response . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Update Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Update Time Calculation Example . . . . . . . . . . . . . . . . 4-8

Channel Turn-On, Turn-Off, and Reconfiguration Times . . . 4-9

Response to Slot Disabling . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Input Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Output Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Chapter 5

Channel Configuration, Data, and

Status

Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Channel Configuration Procedure . . . . . . . . . . . . . . . . . . . 5-2

Select Input Type (Bits 0-3) . . . . . . . . . . . . . . . . . . . . . 5-5

Select Data Format (Bits 4 and 5) . . . . . . . . . . . . . . . . . 5-5

Using Scaled-for-PID and Proportional Counts . . . . . . . 5-6

Scaling Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

Select Open Circuit State (Bits 6 and 7). . . . . . . . . . . . . 5-10

Select Temperature Units (Bit 8) . . . . . . . . . . . . . . . . . . 5-11

Select Channel Filter Frequency (Bits 9 and 10). . . . . . . 5-11

Select Channel Enable (Bit 11) . . . . . . . . . . . . . . . . . . . 5-12

Unused Bits (Bits 12-15). . . . . . . . . . . . . . . . . . . . . . . . 5-12

Channel Data Word. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

Channel Status Checking . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

Status Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15

Input Type Status (Bits 0-3) . . . . . . . . . . . . . . . . . . . . . 5-15

Data Format Type Status (Bits 4 and 5). . . . . . . . . . . . . 5-15

Open Circuit Type Status (Bits 6 and 7) . . . . . . . . . . . . 5-15

Temperature Units Type Status (Bit 8). . . . . . . . . . . . . . 5-16

Channel Filter Frequency (Bits 9 and 10) . . . . . . . . . . . 5-16

Channel Status (Bit 11). . . . . . . . . . . . . . . . . . . . . . . . . 5-16

Open-Circuit Error (Bit 12) . . . . . . . . . . . . . . . . . . . . . . 5-16

Under-Range Error (Bit 13). . . . . . . . . . . . . . . . . . . . . . 5-16

Over-Range Error (Bit 14). . . . . . . . . . . . . . . . . . . . . . . 5-17

Configuration Error (Bit 15) . . . . . . . . . . . . . . . . . . . . . 5-17

Chapter 6

Ladder Programming Examples

Initial Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Dynamic Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Verifying Channel Configuration Changes . . . . . . . . . . . . . 6-4

Interfacing to the PID Instruction. . . . . . . . . . . . . . . . . . . . 6-5

Monitoring Channel Status Bits . . . . . . . . . . . . . . . . . . . . . 6-6

Invoking Autocalibration . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

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Table of Contents iii

Chapter 7

Module Diagnostics and

Troubleshooting

Module Operation vs Channel Operation . . . . . . . . . . . . . . 7-1

Power-up Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Channel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Channel Status LEDs (Green) . . . . . . . . . . . . . . . . . . . . 7-4

Invalid Channel Configuration . . . . . . . . . . . . . . . . . . . 7-4

Open Circuit Detection . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Out-Of-Range Detection. . . . . . . . . . . . . . . . . . . . . . . . 7-5

Module Status LED (Green) . . . . . . . . . . . . . . . . . . . . . 7-5

Troubleshooting Flowchart . . . . . . . . . . . . . . . . . . . . . . . . 7-6

Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

Contacting Rockwell Automation . . . . . . . . . . . . . . . . . . . . 7-7

Chapter 8

Application Examples

Basic Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Application Setup (Display a Temperature) . . . . . . . . . 8-1

Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

Supplementary Example . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

Application Setup (Four Channels °C - °F) . . . . . . . . . . 8-4

Device Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

Program Setup and Operation Summary . . . . . . . . . . . . 8-7

Program Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7

Appendix A

Specifications

Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Physical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . A-2

Input Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

1746-NT4 Module Accuracy . . . . . . . . . . . . . . . . . . . . . A-4

Input Resolution per Thermocouple Type at Each Filter

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Appendix B

NT4 Configuration Worksheet

Channel Configuration Procedure . . . . . . . . . . . . . . . . . . . B-1

Channel Configuration Worksheet . . . . . . . . . . . . . . . . . . . B-4

Appendix C

Thermocouple Restrictions

J Type Thermocouple . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

(Iron vs. Copper-Nickel <Constantan>) . . . . . . . . . . . . . C-1

K Type Thermocouple . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

(NIckel-Chromium vs. Nickel-Aluminum) . . . . . . . . . . . C-2

T Type Thermocouple. . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

Publication 1746-UM007C-EN-P - July 2004

Table of Contents iv

(Copper vs. Copper-Nickel <Constantan>) . . . . . . . . . . C-3

E Type Thermocouple. . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4

(Nickel-Chromium vs. Copper-Nickel <Constantan>) . . . C-4

S and R Type Thermocouples . . . . . . . . . . . . . . . . . . . . . . C-5

S (Platinum-10% Rhodium vs. Platinum)

R (Platinum-13% Rhodium vs. Platinum) . . . . . . . . . . . C-5

Appendix D

Thermocouple Types

Appendix E

Configuring the 1746-NT4 Module

with RSLogix 500

Glossary

Index

1Publication 1746-UM007C-EN-P - July 2004

Preface

Read this preface to familiarize yourself with the rest of the manual.

The preface includes:

•Who Should Use this Manual

•Purpose of this Manual

•Common Techniques Used in this Manual

Who Should Use this

Manual

Use this manual if you are responsible for designing, installing,

programming, or troubleshooting control systems that use SLC 500

4-Channel Thermocouple/mV Input Module.

You should have a basic understanding of electrical circuitry and

familiarity with relay logic. If you do not, obtain the proper training

before using this product.

Purpose of this Manual

This manual describes the procedures you use to install, wire, and

troubleshoot your 4-channel thermocouple/mV module. This manual:

•explains how to install and wire your module

•gives you an overview of the SLC 500 programmable controller

system

Refer to your programming software user documentation for more

information on programming your SLC 500 programmable controller.

Publication 1746-UM007C-EN-P - July 2004

2 Preface

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