Allen-Bradley SLC 500 1746-NT8 Bedienungsanleitung

Publication 1746-5.23

SLC 500 Thermocouple/mV Analog

Input Module

(Catalog Number 1746-NT8)

Installation Instructions

Inside...

Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . 2

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

Module Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Input Ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Hardware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installing And Wiring Your Module . . . . . . . . . . . . . . . . . . . 8

Electrostatic Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Required Tools and Equipment. . . . . . . . . . . . . . . . . . . . . . 9

Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Considerations for a Modular System. . . . . . . . . . . . . . . . . 10

Considerations for a Fixed Controller . . . . . . . . . . . . . . . . . 10

Selecting A Rack Slot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Module Installation and Removal . . . . . . . . . . . . . . . . . . . . 11

Terminal Block Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Cold Junction Compensation (CJC) . . . . . . . . . . . . . . . . . . 13

Wiring Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Thermocouple Junctions. . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Preparing and Wiring the Cables . . . . . . . . . . . . . . . . . . . . 18

Module Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

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2SLC 500 Thermocouple/mV Analog Input Module

Publication 1746-5.23

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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 purposes of 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 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 in part,

without written permission of Allen-Bradley Company, Inc., is prohibited.

Throughout these installation instructions we use notes to make you aware of

safety considerations:

Attention statements help you to:

• identify a hazard

• avoid the hazard

• recognize the consequences

!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.

SLC 500 Thermocouple/mV Analog Input Module 3

Publication 1746-5.23

For More Information

As part of our effort to preserve, protect, and improve our environment, Allen-

Bradley is reducing the amount of paper we use. Less paper means more options

for you. In addition to traditional printed publications and CD-ROM versions, we

now offer on-line manuals with the most up-to-date information you can get. We

recommend that you read the related publications listed below before starting up

your control system.

Related Publications

How to Get More Information

If you would like a manual, you can:

• download a free electronic version from the internet at

www.theautomationbookstore.com

• purchase a manual by:

— contacting your local distributor or Rockwell Automation

representative

— visiting www.theautomationbookstore.com and placing your order

— 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™ Thermocouple/mV

Input Module

SLC 500™ Thermocouple/

mV Analog Input Module

User Manual 1746-6.22

A more detailed description on how to install

and use your SLC 500™ Modular Hardware

Style Control System.

SLC 500™ Modular

Hardware Style Installation

and Operation Manual 1747-6.2

More information on proper wiring and

grounding techniques. Automation Wiring and

Grounding Guidelines 1770-4.1

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4SLC 500 Thermocouple/mV Analog Input Module

Publication 1746-5.23

Module Overview

The module communicates with the SLC 500 processor and receives +5V dc and

+24V dc power from the system power supply through the parallel backplane

interface. No external power supply is required. You may install as many

thermocouple modules in the system as the power supply can support.

Each module channel can receive input signals from a thermocouple or a

millivolt analog input device. You configure each channel to accept either one.

The module converts analog input voltages when it is configured for

thermocouple input types. The analog input voltages are converted into cold-

junction compensated, digital temperature readings. The module uses the

National Institute of Standards and Technology (NIST) based on ITS-90 for

thermocouple linearization.

When configured for millivolt analog inputs, the module converts analog values

directly into digital counts. The module assumes that the mV input signal is

linear prior to input to the module.

SLC 500 Thermocouple/mV Analog Input Module 5

Publication 1746-5.23

Input Ranges

The following tables define thermocouple types and associated temperature

ranges and the millivolt analog input signal ranges that each of the module’s

input channels will support. To determine the practical temperature range of your

thermocouple, refer to the specifications in Appendix A of the SLC 500

Thermocouple/mV Analog Input Module User Manual, publication 1746-6.22.

Thermocouple Temperature Ranges

Millivolt Input Ranges

Each input channel is individually configured for a specific input device. Each

channel detects and indicates:

• open-circuit

• over-range

• under-range

Type °C Temperature Range °F Temperature Range

J-210 °C to 760 °C -346 °F to 1400 °F

K -270 °C to 1370 °C -454 °F to 2498 °F

T -270 °C to 400 °C -454 °F to 752 °F

B 300 °C to 1820 °C 572 °C to 3308 °F

E -270 °C to 1000 °C -454 °F to 1832 °F

R 0 °C to 1768 °C 32 °F to 3214 °F

S 0 °C to 1768 °C 32 °F to 3214 °F

N 0 °C to 1300 °C 32 °F to 2372 °F

CJC Sensor -25 °C to 105 °C -13 °F to 221 °F

-50 to +50 mV

-100 to +100 mV

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6SLC 500 Thermocouple/mV Analog Input Module

Publication 1746-5.23

Hardware Features

The module fits into any single slot (other than slot 0) for I/O modules in either

an SLC 500 modular system or an SLC 500 fixed system expansion chassis

(1746-A2). It is a Class 11module (uses 8 input words and 8 output words).

The module contains a removable terminal block providing connections for eight

thermocouple and/or analog input devices. On the terminal block are two cold-

junction compensation (CJC) sensors that compensate for the cold junction at

ambient temperature. It should also be noted there are no output channels on the

module. Configure the module with software rather than with jumpers or

switches.

1. Requires use of a Block Transfer in a remote configuration.

Important:

There is a jumper (JP1) on the circuit board. The module is

shipped with the jumper in the up position as illustrated below. Do

not change the position of JP1. The jumper is used for test

purposes only.

JP1

Jumper - Do Not move.

SLC 500 Thermocouple/mV Analog Input Module 7

Publication 1746-5.23

1746-NT8 Features

Hardware Function

Channel Status LED Indicators Display operating and fault status of channels 0-7

Module Status LED Displays operating and fault status of the module

Side Label (Nameplate) Provides module information

Removable Terminal Block Provides electrical connection to input devices

Door Label Permits easy terminal identification

Self Locking Tabs Secure module in chassis slot

MODULE

CHANNEL

STATUS

THERMOCOUPLE/mV

INPUT

CJC A+

CJC A-

CHL 0+

CHL 0-

SHIELD

CHL 1+

CHL 1-

CHL 2+

CHL 2-

SHIELD

CHL 3+

CHL 3-

CHL 4+

CHL 4-

SHIELD

CHL 5+

CHL 5-

CHL 6+

CHL 6-

SHIELD

CHL 7+

CHL 7-

CJC B+

CJC B-

1746-NT8

Door Label

Channel Status

LEDs (Green)

Module Status

LED (Green)

Removable

Terminal Block

CJC Sensors

Cable Tie Slots

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8SLC 500 Thermocouple/mV Analog Input Module

Publication 1746-5.23

Installing And Wiring Your Module

Read this section to install and wire your module. This section covers:

• avoiding electrostatic damage

• determining power requirements

• installing the module

• wiring signal cables to the module’s terminal block

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:

!ATTENTION: ELECTROSTATICALLY SENSITIVE

COMPONENTS

• Before handling the module, touch a grounded object to rid

yourself of electrostatic charge.

• Handle the module from the front, away from the backplane

connector. Do not touch backplane connector pins.

• Keep the module in its static-shield container when not in

use or during shipment.

Failure to observe these precautions can degrade the module’s

performance or cause permanent damage.

SLC 500 Thermocouple/mV Analog Input Module 9

Publication 1746-5.23

Required Tools and Equipment

Have the following tools and equipment ready:

• 2.5 mm (0.1 in.) slot-head screwdriver

• thermocouple or millivolt sensor

• appropriate thermocouple extension wire (if needed)

• thermocouple/mV input module (1746-NT8)

• programming equipment

Power Requirements

The 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 following table.

Maximum Current Drawn By the Module

5VDC Amps 24VDC Amps

0.120 0.070

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10 SLC 500 Thermocouple/mV Analog Input Module

Publication 1746-5.23

Considerations for a Modular System

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

chassis, except for the left-most slot (slot 0) reserved for the SLC processor or

adapter modules.

Considerations for a Fixed Controller

The power supply in the 2-slot SLC 500 fixed I/O chassis (1746-A2) can support

only specific combinations of modules. Make sure the chassis power supply can

support the 1746-NT8 and additional module power requirements.

Selecting A Rack Slot

Two factors determine where you should install your module in the rack: ambient

temperature and electrical noise. When selecting a slot for your module, try to

position your module:

• in a rack close to the bottom of the enclosure (where the air is cooler)

• away from modules that generate significant heat, such as the 1746-OA16

or the 1746-IA16

• in a slot away from ac or high-voltage dc modules, hard contact switches,

relays, and ac motor drives

• away from the rack power supply (if using a modular system)

Remember that in a modular system, a processor or adapter always occupies the

first slot of the rack.

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