Rockwell Automation Allen-Bradley B Series Bedienungsanleitung

Publication 1746-IN010D-EN-P - June 2004

Installation Instructions

SLC™ 500 4-Channel Thermocouple/mV Input

Module

(Catalog Number 1746-NT4, Series B)

Inside…............................................................................................Page

For More Information............................................................................... 3

Hazardous Location Considerations .........................................................4

Environnements dangereux ..................................................................... 4

Overview ...................................................................................................5

Required Tools and Equipment ................................................................ 6

Electrostatic Damage............................................................................... 7

NT4 Power Requirements........................................................................ 7

Modular Chassis Considerations............................................................. 7

Fixed Expansion Chassis Considerations................................................. 8

General Considerations ........................................................................... 8

Terminal Block Removal........................................................................... 8

Module Installation and Removal.......................................................... 10

Terminal Wiring...................................................................................... 11

Thermocouple Junctions........................................................................ 12

Wiring Considerations ........................................................................... 13

Wiring Input Devices to the NT4 ........................................................... 15

Cold-Junction Compensation (CJC) ....................................................... 16

Module Addressing................................................................................ 17

Channel Configuration ........................................................................... 17

Specifications ........................................................................................ 19

2SLC™ 500 4-Channel Thermocouple/mV Input Module

Publication 1746-IN010D-EN-P - June 2004

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.

SLC™ 500 4-Channel Thermocouple/mV Input Module 3

Publication 1746-IN010D-EN-P - June 2004

For More Information

Related Publications

If you would like a manual, you can:

•download an electronic version from the internet:

www.theautomationbookstore.com

•order a printed manual by:

–contacting your local distributor or Rockwell Automation representative

–visiting www.theautomationbookstore.com

–calling 1.800.963.9548 (USA/Canada) or 001.330.725.1574 (Outside

USA/Canada)

For: Refer to this Document: Pub. No.

A more detailed description on how to install and

use your SLC 500 4-Channel Thermocouple/mV Input

Module.

Thermocouple/mV Input Module

User Manual

1746-6.6.1

A more detailed description on how to install and

use your SLC 500 Modular Hardware Style Control

System.

SLC™ 500 Modular Hardware

Style User Manual

1747-UM011

A more detailed description on how to install and

use your SLC 500 Fixed Hardware Style Control

System.

SLC™ 500 Fixed Hardware Style

Installation and Operation Manual

1747-6.21

4SLC™ 500 4-Channel Thermocouple/mV Input Module

Publication 1746-IN010D-EN-P - June 2004

Hazardous Location Considerations

This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or

non-hazardous locations only. The following WARNING statement applies to use in

hazardous locations.

Environnements dangereux

Cet équipement est conçu pour être utilisé dans des environnements de Classe I,

Division 2, Groupes A, B, C, D ou non dangereux. La mise en garde suivante

s’applique à une utilisation dans des environnements dangereux.

WARNING EXPLOSION HAZARD

•Substitution of components may impair suitability for Class

I, Division 2.

•Do not replace components or disconnect equipment

unless power has been switched off or the area is known to

be non-hazardous.

•Do not connect or disconnect components unless power

has been switched off or the area is known to be

non-hazardous.

•All wiring must comply with N.E.C. article 501-4(b).

WARNING DANGER D’EXPLOSION

•La substitution de composants peut rendre cet équipement

impropre à une utilisation en environnement de Classe I,

Division 2.

•Ne pas remplacer de composants ou déconnecter

l'équipement sans s'être assuré que l'alimentation est

coupée.

•Ne pas connecter ou déconnecter des composants sans

s'être assuré que l'alimentation est coupée.

SLC™ 500 4-Channel Thermocouple/mV Input Module 5

Publication 1746-IN010D-EN-P - June 2004

Overview

The thermocouple/mV input module receives and stores digitally converted

thermocouple and/or millivolt (mV) analog data into its image table for retrieval by

all fixed and modular SLC 500 processors. The module supports connections from

any combination of up to four thermocouple or mV analog sensors. See the input

specifications beginning on page 21 for thermocouple types, their associated

temperature ranges, and the analog input signal ranges that each 1747-NT4 channel

will support. Each input channel is individually configurable via software for a

specific input device and provides open-circuit, over-range, and under-range

detection and indication.

The module contains a removable terminal block with two cold-junction

compensation (CJC) sensors. There are no output channels on the module.

Configuration is done via the user program. There are no DIP switches.

Channel Status LEDs

Channel status LEDs indicate the status for channels 0 through 3. Related error

information is contained in the channel status word. This includes conditions such

as:

•normal operation

•channel-related configuration errors

•open-circuit errors

•out-of-range errors

All channel errors are recoverable errors.

Module Status LED

The module status LED shows diagnostic or operating errors related to the module.

These non-recoverable errors may be detected during power-up or during

operation. Once an error has been detected, the module no longer communicates

with the SLC processor. Channel states are disabled, and data words are cleared (0).

Failure of any diagnostic test results in a non-recoverable error and requires the

assistance of your local Allen-Bradley distributor or Rockwell Automation

representative.

6SLC™ 500 4-Channel Thermocouple/mV Input Module

Publication 1746-IN010D-EN-P - June 2004

1747-NT4 Thermocouple Module Hardware Features

Required Tools and Equipment

Have the following tools and equipment ready:

•medium blade screwdriver

•medium cross-head screwdriver

•thermocouple or millivolt sensor

•appropriate thermocouple extension wire (if needed)

•thermocouple/mV input module (1746-NT4)

•programming equipment

INPUT

CJC A+

SHIELD

CHL3-

CHL3+

CHL2-

CHL2+

CHL1-

CHL1+

CHL0-

CHL0+

Do Not

Remove

CJC A±

Do Not

Remove

CJC B±

Do Not

Remove

CJC B+

Do Not

Remove

SHIELD

ANLG

MODULE STATUS

CHANNEL

STATUS

THERMOCOUPLE/mV

COM

Door Label

Channel Status

LEDs (Green)

Module Status

LED (Green)

Removable

Terminal Block

CJC Sensors

Cable Tie Slots

SLC™ 500 4-Channel Thermocouple/mV Input Module 7

Publication 1746-IN010D-EN-P - June 2004

Electrostatic Damage

Electrostatic discharge can damage semiconductor devices inside this module if you

touch backplane connector pins. Guard against electrostatic damage by observing

the following precautions.

•Wear an approved wrist strap grounding device when handling the module.

•Touch a grounded object to rid yourself of electrostatic charge before

handling the module.

•Handle the module from the front, away from the backplane connector. Do

not touch backplane connector pins.

•Keep the module in its static-shield bag when not in use, or during

shipment.

NT4 Power Requirements

The thermocouple module receives its power through the SLC 500 chassis

backplane from the fixed or modular +5V dc/+24V dc chassis power supply. The

maximum current drawn by the module is shown in the table below.

When you are using a modular system configuration, add the values shown in the

table above to the requirements of all other modules in the SLC chassis to prevent

overloading the chassis power supply.

When you are using a fixed system controller, refer to the important note on page 8

about module compatibility in a 2-slot fixed expansion chassis.

Modular Chassis Considerations

Place your thermocouple module in any slot of an SLC 500 modular, or modular

expansion chassis, except for the extreme left slot (slot 0) in the first chassis. This

slot is reserved for the processor or adapter modules.

ATTENTION Electrostatic discharge can degrade performance or cause

permanent damage. Handle the module as stated below.

5V dc Amps 24V dc Amps

0.060 0.040

8SLC™ 500 4-Channel Thermocouple/mV Input Module

Publication 1746-IN010D-EN-P - June 2004

Fixed Expansion Chassis Considerations

General Considerations

Most applications require installation in an industrial enclosure to reduce the effects

of electrical interference. Thermocouple inputs are highly susceptible to electrical

noises due to the small amplitudes of their signal (microvolt/°C).

Group your modules to minimize adverse effects from radiated electrical noise and

heat. Consider the following conditions when selecting a slot for the thermocouple

module. Position the module:

•in a slot away from sources of electrical noise, such as hard-contact switches,

relays, and AC motor drives

•away from modules which generate significant radiated heat, such as

32-point I/O modules

In addition, route shielded, twisted-pair thermocouple or millivolt input wiring

away from any high-voltage I/O wiring.

Terminal Block Removal

When installing the module in a chassis, it is not necessary to remove the terminal

block from the module. However, if the terminal block is removed, use the write-on

label located on the side of the terminal block to identify the module location and

type.

IMPORTANT The 2-slot, SLC 500 fixed I/O expansion chassis (1746-A2) will

support only specific combinations of modules. If you are using

the thermocouple module in a 2-slot expansion chassis with

another SLC I/O or communication module, refer to the

SLC 500™Thermocouple/mV Input Module User Manual,

1746-6.6.1

ATTENTION Disconnect power to the SLC before attempting to install,

remove, or wire the removable terminal wiring block.

To avoid cracking the removable terminal block, alternate the

removal of the slotted terminal block release screws.

SLC™ 500 4-Channel Thermocouple/mV Input Module 9

Publication 1746-IN010D-EN-P - June 2004

To remove the terminal block:

1. Loosen the two terminal block release screws.

2. Grasp the terminal block at the top and bottom and pull outward and down.

When removing or installing the terminal block, be careful not to damage

the CJC sensors.

CJC Sensors

Terminal Block Release Screws

Max. Torque = 0.7 to 0.9 Nm (6 to 8

in-lb)

10 SLC™ 500 4-Channel Thermocouple/mV Input Module

Publication 1746-IN010D-EN-P - June 2004

Module Installation and Removal

Module Installation Procedure

1. Align the circuit board of the thermocouple module with the card guides

located at the top and bottom of the chassis.

2. Slide the module into the chassis until both top and bottom retaining clips

are secured. Apply firm even pressure on the module to attach it to its

backplane connector. Never force the module into the slot.

3. Cover all unused slots with the Card Slot Filler, Catalog Number 1746-N2.

Module Removal Procedure

1. Press the releases at the top and bottom of the module and slide the module

out of the chassis slot.

2. Cover all unused slots with the Card Slot Filler, Catalog Number 1746-N2.

Top and Bottom Module

Card

Guide

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