Allen-Bradley 1746-NT8 Manual de usuario

SLC 500

Thermocouple/mV

Analog Input

Module

1746-NT8

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, when necessary 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 equipment (e.g.,

drive or motor) to alert people that dangerous voltage may

be present.

BURN HAZARD Labels may be located on or inside the equipment (e.g.,

drive or motor) to alert people that surfaces may be

dangerous temperatures.

iPublication 1746-UM022B-EN-P - January 2005

Table of Contents

Preface

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

What This Manual Covers . . . . . . . . . . . . . . . . . . . . . . . . . P-1

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

Common Techniques Used in this Manual . . . . . . . . . . . . . P-2

Chapter 1

Module Overview

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

Input Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

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

Diagnostic LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

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

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

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

Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

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

Chapter 2

Installing And Wiring Your

Module

Electrostatic Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Considerations for a Modular System . . . . . . . . . . . . . . 2-2

Fixed I/O Chassis - I/O Module Compatibility . . . . . . . . 2-3

General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Module Installation and Removal . . . . . . . . . . . . . . . . . . . . 2-5

Terminal Block Removal . . . . . . . . . . . . . . . . . . . . . . . 2-6

Wiring Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Preparing and Wiring the Cables . . . . . . . . . . . . . . . . . 2-9

Cold-Junction Compensation (CJC) . . . . . . . . . . . . . . . . 2-11

Chapter 3

Considerations Before Using Your

Module

Module ID Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Output Image - Configuration Words . . . . . . . . . . . . . . 3-2

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

Channel Filter Frequency Selection . . . . . . . . . . . . . . . . . . 3-3

Channel Cut-Off Frequencyc . . . . . . . . . . . . . . . . . . . . 3-4

Channel Step Response . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Update Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Update Time Calculation Example . . . . . . . . . . . . . . . . 3-8

Channel Turn-On, Turn-Off, and Reconfiguration Times . . . 3-8

Auto-calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Response to Slot Disabling . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Input Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Output Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

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Table of Contents ii

Chapter 4

Channel Configuration, Data, and

Status

Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Channel Configuration Procedure . . . . . . . . . . . . . . . . . . . 4-2

Select Channel Enable (Bit 0) . . . . . . . . . . . . . . . . . . . . 4-5

Select Input Types (Bits 1 through 4) . . . . . . . . . . . . . . 4-5

Select Data Format (Bits 5 and 6) . . . . . . . . . . . . . . . . . 4-5

Using Scaled-for-PID and Proportional Counts . . . . . . . 4-6

Effective Resolutions . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Scaling Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Select Open-Circuit State (Bits 7 and 8). . . . . . . . . . . . . 4-9

Select Temperature Units (Bit 9) . . . . . . . . . . . . . . . . . . 4-10

Select Channel Filter Frequency (Bits 10 and 11) . . . . . . 4-10

Unused Bits (Bits 12 through 14) . . . . . . . . . . . . . . . . . 4-11

Select Input Image Type (Bit 15) . . . . . . . . . . . . . . . . . 4-11

Channel Data/Status Word. . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Channel Status Checking . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Channel Status (Bit 0) . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Input Type Status (Bits 1 through 4) . . . . . . . . . . . . . . . 4-14

Data Format Type Status (Bits 5 and 6) . . . . . . . . . . . . . 4-14

Open-Circuit Type Status (Bits 7 and 8) . . . . . . . . . . . . 4-14

Temperature Units Type Status (Bit 9). . . . . . . . . . . . . . 4-14

Channel Filter Frequency (Bits 10 and 11). . . . . . . . . . . 4-15

Open-Circuit E. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Under-Range Error (Bit 13). . . . . . . . . . . . . . . . . . . . . . 4-15

Over-Range Error (Bit 14). . . . . . . . . . . . . . . . . . . . . . . 4-15

Channel Error (Bit 15) . . . . . . . . . . . . . . . . . . . . . . . . . 4-15

Chapter 5

Programming Examples

Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Automatic Monitoring Thermocouples and CJC Sensors . . . 5-3

Verifying Configuration Changes . . . . . . . . . . . . . . . . . . . . 5-3

Interfacing to the PID Instruction. . . . . . . . . . . . . . . . . . . . 5-7

Monitoring Channel Status Bits . . . . . . . . . . . . . . . . . . . . . 5-8

Monitoring Channel Status Bits Example . . . . . . . . . . . . 5-9

PLC 5 Example with NT8 in Remote I/O Rack . . . . . . . . . . 5-13

SLC 500 Example with NT8 in Remote I/O Rack. . . . . . . . . 5-15

Chapter 6

Troubleshooting Your Module

Module and Channel Diagnostics. . . . . . . . . . . . . . . . . . . . 6-1

Module Diagnostics at Powerup . . . . . . . . . . . . . . . . . . 6-1

Channel Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

LED Troubleshooting Tables. . . . . . . . . . . . . . . . . . . . . 6-3

Channel-status LEDs (Green) . . . . . . . . . . . . . . . . . . . . 6-4

Open-circuit Detection (Bit 12). . . . . . . . . . . . . . . . . . . 6-4

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Table of Contents iii

Out-of-Range Detection (Bit 13 for Under Range, Bit 14 for

Over Range) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Channel Error (Bit 15) . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Module Status LED (Green) . . . . . . . . . . . . . . . . . . . . . 6-5

Interpreting I/O Error Codes . . . . . . . . . . . . . . . . . . . . . . . 6-5

Chapter 7

Maintaining Your Module And

Safety Considerations

Preventive Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Appendix A

Module Specifications

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

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

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

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

Overall Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Millivolt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Thermocouple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Appendix B

Using Grounded Junction,

Ungrounded Junction, and

Exposed Junction Thermocouples

Thermocouple Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Grounded Junction . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Ungrounded (Insulated) Junction . . . . . . . . . . . . . . . . . B-2

Exposed Junction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Grounded Junction . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Exposed Junction Thermocouples. . . . . . . . . . . . . . . . . B-4

Appendix C

Configuring the 1746-NT8 Module

with RSLogix 500

Glossary

Index

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Table of Contents iv

1Publication 1746-UM022B-EN-P - January 2005

Summary of Changes

The information below summarizes the changes to this manual since

the last printing. Updates to the manual include using RSLogix 500

instead of APS software.

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.

The table below lists the sections that document new features and

additional or updated information on existing features.

For this information: See

updated data table for initial programming page 5-2

added SLC 500 example with NT8 in

Remote I/O Rack

page 5-15

updated thermocouple graphs page A-8

configuring NT8 with RSLogix 500 page C-1

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Summary of Changes 2

1Publication 1746-UM022B-EN-P - January 2005

Preface

Read this preface to familiarize yourself with this user manual. This

preface covers:

•who should use this manual

•what this manual provides

•related documents

•common techniques used in this manual

Who Should Use This

Manual

Use this manual if you design, install, program, or maintain a control

system that uses SLC 500controllers.

You should have a basic understanding of SLC 500 products. You

should also understand electronic process control and the ladder

program instructions required to generate the electronic signals that

control your application. If you do not, contact your local Rockwell

Automation representative for the proper training before using these

products.

What This Manual Covers

This manual covers the 1746-NT8 thermocouple/millivolt analog input

module. It contains the information you need to install, wire, use, and

maintain these modules. It also provides diagnostic and

troubleshooting help should the need arise.

Publication 1746-UM022B-EN-P - January 2005

Preface 2

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