Allen-Bradley CompactBlock LDX 1790D-T4T0 Bedienungsanleitung

CompactBlock LDX

I/O Thermocouple

Modules

1790D-T4T0, 1790D-4T0, 1790P-T4T0

User Manual

AB Drives

Important User Information

Because of the variety of uses for the products described in this

publication, those responsible for the application and use of these

products 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. In no event will Rockwell Automation be

responsible or liable for indirect or consequential damage resulting

from the use or application of these products.

Any illustrations, charts, sample programs, and layout examples

shown in this publication are intended solely for purposes of

example. Since there are many variables and requirements associated

with any particular installation, Rockwell Automation 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 that 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 part, without written permission of Rockwell Automation, is

prohibited.

Throughout this publication, notes may be used to make you aware

of safety considerations. The following annotations and their

accompanying statements help you to identify a potential hazard,

avoid a potential hazard, and recognize the consequences of a

potential hazard:

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.

ATTENTION

Identifies information about practices or

circumstances that can 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.

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Rockwell Automation

Support

Before you contact Rockwell Automation for technical assistance, we

suggest you please review the troubleshooting information contained

in this publication first.

If the problem persists, call your local Rockwell Automation

representative or contact Rockwell Automation in one of the following

ways:

If you need to contact Rockwell Automation for assistance, please

have the following information available when you call:

•a clear statement of the problem, including a description of what

the system is actually doing. Note the LED state; also note input

and output image words for the module.

•a list of remedies you have already tried

•processor type and firmware number (See the label on the

processor)

•hardware types in the system, including all I/O modules

•fault code if the processor is faulted

Your Questions or Comments on this Manual

If you find a problem with this manual, please notify us of it on the

enclosed How Are We Doing form.

Phone United

States/Canada

1.440.646.5800

Outside United

States/Canada

You can access the phone number for your

country via the Internet:

1. Go to http://www.ab.com

2. Click on Product Support

(http://support.automation.rockwell.com)

3. Under Support Centers, click on Contact

Information

Internet ⇒1. Go to http://www.ab.com

2. Click on Product Support

(http://support.automation.rockwell.com)

vPublication 1790-UM003A-EN-P - May 2002

Table of Contents

Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . iii

Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . . iv

Your Questions or Comments on this Manual . . . . . . . . . iv

Chapter 1

Overview

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

Thermocouple/mV Inputs and Ranges . . . . . . . . . . . . . 1-2

Hardware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

General Diagnostic Features . . . . . . . . . . . . . . . . . . . . . 1-4

System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

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

Module Operation - DeviceNet Example . . . . . . . . . . . . 1-5

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Chapter 2

Installation and Wiring

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

1790D-4T0/T4T0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

1790P-T4T0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

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

Hazardous Location Considerations . . . . . . . . . . . . . . . 2-2

Selecting a Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Protecting the Circuit Board from Contamination. . . . . . 2-6

Installing CompactBlock LDX I/O. . . . . . . . . . . . . . . . . 2-6

Set the Node Address on the DeviceNet 1790D-4T0/T4T0

Base Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Set the Station Address on the 1790P-T4T0 PROFIBUS DP

Base Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Mount the Base Block . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

DIN Rail Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Connect the DeviceNet Cable to the 1790D-4T0/T4T0 Base

Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Connect the PROFIBUS DP Terminal Connector to the

1790P-T4T0 Base Block . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Connect Power to the 1790P-T4T0 Block . . . . . . . . . . . 2-11

Field Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

System Wiring Guidelines. . . . . . . . . . . . . . . . . . . . . . . 2-12

Wiring the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Wiring the Terminal Blocks . . . . . . . . . . . . . . . . . . . . . 2-15

Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . 2-16

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

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Publication 1790-UM003A-EN-P - May 2002

Chapter 3

Module Data, Status, and Channel

Configuration for DeviceNet

Module Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Input Image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Accessing Input Image File Data . . . . . . . . . . . . . . . . . . . . 3-1

Input Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Input Data Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Under-Range Flag Bits (S0 to S3) . . . . . . . . . . . . . . . . . 3-2

Over-Range Flag Bits (S8 to S11) . . . . . . . . . . . . . . . . . 3-3

Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Filter Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Channel Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Channel Cutoff Frequency . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Effective Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . 3-11

Determining Module Update Time. . . . . . . . . . . . . . . . . . . 3-12

Calculating Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Configuring DeviceNet Thermocouple/mV Module

(1790D-4T0/T4T0). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Configure DeviceNet Thermocouple/mV Modules Using

RSNetWorx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

Chapter 4

Diagnostics and Troubleshooting

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Activating Devices When Troubleshooting . . . . . . . . . . 4-1

Stand Clear of the Equipment. . . . . . . . . . . . . . . . . . . . 4-2

Program Alteration. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Safety Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Module Operation vs. Channel Operation . . . . . . . . . . . . . 4-2

Power-up Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Module Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Network Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Channel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Over- or Under-Range Detection . . . . . . . . . . . . . . . . . 4-4

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

Module Error Definition Table . . . . . . . . . . . . . . . . . . . 4-5

Channel LED Indicator Operation . . . . . . . . . . . . . . . . . . . 4-5

Appendix A

Specifications

Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . A-1

DeviceNet Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

PROFIBUS DP Specifications . . . . . . . . . . . . . . . . . . . . . . . A-2

General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Thermocouple/mV Specifications. . . . . . . . . . . . . . . . . . . . A-4

Publication 1790-UM003A-EN-P - May 2002

vii

Appendix B

Two’s Complement Binary

Numbers

Positive Decimal Values . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Negative Decimal Values. . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Appendix C

Thermocouple Descriptions

International Temperature Scale of 1990. . . . . . . . . . . . . . . C-1

Type B Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Type E Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

Type J Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5

Type K Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7

Type N Thermocouples. . . . . . . . . . . . . . . . . . . . . . . . . . . C-9

Type R Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-11

Type S Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-12

Type T Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-14

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-17

Appendix D

Using Thermocouple Junctions

Using a Grounded Junction Thermocouple . . . . . . . . . . . . D-1

Using an Ungrounded (Isolated) Junction Thermocouple . . D-2

Using an Exposed Junction Thermocouple. . . . . . . . . . . . . D-3

Appendix E

Module Configuration for

PROFIBUS

Configure PROFIBUS Thermocouple/mV Modules (1790P-T4R0)

E-1

Configure Thermocouple/mV Modules Using the SST PROFIBUS

Configuration Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Save the Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7

Download the Configuration . . . . . . . . . . . . . . . . . . . . . . . E-7

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-10

Glossary

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1

Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-1

AB Drives

Publication 1790-UM003A-EN-P - May 2002

viii

1Publication 1790-UM003A-EN-P

Chapter

Overview

This chapter describes the 1790D-4TO/T4TO (1790P-T4TO)

Thermocouple/mV Input module and explains how the module reads

thermocouple or millivolt analog input data. Included is:

•the module’s hardware and diagnostic features

•an overview of system and module operation

•compatibility

General Description

The thermocouple/mV input module supports thermocouple and millivolt

signal measurement applications that require up to four channels. It

digitally converts and stores thermocouple and/or millivolt analog data

from any combination of up to four thermocouple or millivolt analog

sensors. Each input channel is individually configurable via software for a

specific input device, and filter frequency, and provides open-circuit,

over-range and under-range detection and indication. When configured

for thermocouple inputs, the module can convert the thermocouple

readings into digital temperature readings in °C or °F. When configured

for mV inputs, the module assumes that the direct mV input signal is

linear prior to input to the module.

The data can be configured on board each module as:

engineering units x 1

The module uses a digital filter that provides high frequency noise

rejection for the input signals. The filter is programmable, allowing you

to select from seven different filter frequencies for each channel:

The module uses five input words for data and status bits. Module

configuration is stored in the module memory. The 1790D modules’

configuration is done via RSNetWorx for DeviceNet™ programming

software. See Chapter 3, Module Data, Status, and Channel Configuration

for DeviceNet ,for details on module configuration. The 1790P module

configuration is explained in Appendix E.

•10 Hz

•25 Hz

•50 Hz

•60 Hz

•100 Hz

•250 Hz

•500 Hz

AB Drives

Publication 1790-UM003A-EN-P

1-2 Overview

Thermocouple/mV Inputs and Ranges

The table below defines thermocouple types and their associated

full-scale temperature ranges. The second table lists the millivolt analog

input signal ranges that each channel will support.

Table 1.1 Thermocouple Analog Input Signal Types

Thermocouple

Type

Temperature

Range

Scaling (Counts) Resolution*

* Filter set for 10 Hz

Accuracy**

(0 to 55°C)

** Module only

B +300 to +1800°C +3000 to +18000 0.1°C ±4.2°C

E -270 to +1000°C -2700 to +10000 0.1°C ±2.5°C

J -210 to +1200°C -2100 to +12000 0.1°C ±2.8°C

K -270 to +1370°C -2700 to +13700 0.1°C ±3.3°C

R -50 to +1768°C -500 to +17680 0.1°C ±3.6°C

S -50 to +1768°C -500 to +17680 0.1°C ±3.6°C

T -270 to 400°C -2700 to 4000 0.1 °C ±1.3°C

N -270 to 1300°C -2700 to 13000 0.1°C ±3.1°C

Table 1.2 mV Analog Input Signal Types

Millivolt Input Range Scaling

(Counts) Resolution*

* Filter set for 10 Hz

Accuracy**

(0 to 55°C)

** Module only

10µV-76.5 to +76.5 mV -7650 to +7650 10µV 306µV

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