Rockwell Automation 1746-INT4 User Manual

Quick Start

Thermocouple/mV Isolated Input Module

Cat. No. 1746-INT4

Contents

Use this document as a guide to install and wire the 1746-INT4 m odule. If you need
more detailed information, refer to the Thermocouple/mV Isolated Input Module

User Manual, publication 1746-6.16.

For this info rmation See page

Important User Information 2
Prevent Electrostatic Discharge 3
How to Get the Related User Manual 4
Unpack the Module 4
Review Power Requirements 4
Install the Module and Connect the Thermocouples 5
Configure the Software 12
Set Up Channel 0 13
Program the Transfer of the Configuration Word 14
Write Ladder Logic to Process Input Data 15
Apply Power and Download Your Program 15
Troublshoot the Module 16
Channel Configuration Worksheet 19

For this reference information See page

Specifications 18

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2 Thermocouple/mV Isolated Input Module

WARNING

!

ATTENTION

!

IMPORTANT

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 R ockwell Automation be responsible or lia ble for indirect or
consequential damage resulting from the use or application of these products.

Any illustratio ns, charts, samp le programs, a nd la yout example s 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.

TM

Allen-Bradley
and Maintenance of Solid-State Control (available from your loca l Ro ckwel l Aut omati on
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 thi s pu blication.

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:

publication SGI-1.1, Safety Guidelines for the Application, Installation

IMPORTANT

Publication 1746-QS002B-EN-P - July 2002

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.

Identifies information about practices or circumstances that can
lead to personal injury or death, property damage, or
economic loss.

Identifies information that is critical for successful application
and understanding of the product.

Thermocouple/mV Isolated Input Module 3

ATTENTION

!

ATTENTION

!

Environment and Enclosure

This equipm ent is intended for use in a Pollution Degree 2
industrial environment, in overvoltage Category II applications (as
defined in IEC p ublica tion 6 0664- 1), at altit udes u p to 2000 me ters
without derating.

This equipmen t i s co nsidered Group 1, Cl a ss A in dustrial
equipment according to IEC/CISPR Publication 11. Without
appropriate precautions, there may be potential difficulties
ensuring electromagnetic compatibility in other environments due
to conducted as well as radiated disturbance.

This equipment is supplied as "open type" equipment. It must be
mounted within an enclosure that is suitably designed for those
specific environmental conditions that will be present and
appropriately designed to prevent personal injury resulting from
accessibility to live parts. The interior of the enclosure must be
accessible only by the use of a tool . S ubsequent sect i ons of this
publication may contain additional information regarding specific
enclosure type rat ings that are required to comply with certain
product safety certifications.

See NEMA Standards p ublication 250 and IEC publication 60529,
as applicable, for explanations of the degrees of protection
provided by different types of enclosure. Also, see the appropriate
sections in this publication, as well as the Allen-Bradley
publication 1770-4.1 ("Industrial Au t oma t ion Wiring and
Grounding Guidelines"), for additional installation requirements
pertaining to this equipment.

Prevent Electrostatic Discharge

This equipment is sensitive to electrostatic discharge which can
cause internal damage and affect normal operation. Follow these
guidelines wh en you handle this equipment :

• touch a grounded object to discharge potential static

• wear an approved grounding wrist strap

• do not touch connectors or pins on component boards

• do not touch circuit components inside the equipment

• if available, use a static-safe workstation

• when not in use, store the equipment in appropriate

static-safe packaging

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4 Thermocouple/mV Isolated Input Module

TIP

How to Get the Related User Manual

The following table describes the related user manual that is available for this
module. To order a copy or to view or download an online version, visit The
Automation Bookstore at: www.theautomationbookstore.com

For more detailed informa tion about: See this document: Publication number:

Installation, configuration, programming,
diagnostics and troubleshooting

Thermocouple.mV Isolated Input
Module User Manual

1746-6.16

Unpack the Module

Unpack the module making sure that the contents include:

• module (catalog number 1746-INT4)

• factory-installed removable terminal block with CJC sensors attached

(catalog number 1746-RT32)

• this Quick Start document (publication number 1746-QS002B-EN-P)

If the contents are incomplete, contact your local Rockwell Automation
representative for assistance.

Review Power Requi rements

Review the power requirements of the modules drawing power from the chassis
power supply.

1. The fixed 2-slot chassis supports 2 1746-INT4 modules. If combining an

INT4 module with a different type of module, refer to Considerations for a
Fixed Controller in Chapter 3 of the user manual.

2. For a modular system, compute the total load on the system power supply

using the procedure described in the SLC Installation and Operation Manual

for Modular Controllers (publication number 1747-UM011) or the SLC 500
Family System Overview (publication 1747-SO001).

For more detailed information on these procedures, refer to
Chapter 3 (Installation and Wiring) and Appendix A
(Module Specifications) of the user manual, publication
1746-6.16.

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Thermocouple/mV Isolated Input Module 5

WARNING

!

WARNING

!

Install the Module and Connect the Thermocouples

If you insert or remove the module while backplane power is
on, an electrical arc can occur. This could cause an explosion
in hazardous location installations. Be sure that power is
removed or the area is nonhazardous before proceeding.

Insert/remove the module into/from the I/O chassis
(slot 1 in this example procedure).

Important:

Thermocouple inputs are highly
susceptible to electrical noise.
To minimize interference:

Place processor and I/O chassis

in an industrial enclosure.

± Keep signal wires as far from

power and load lines as possible.

Use shielded, twisted-pair

thermocouple extension wire.
Ground each shield only at one end.
Use correct thermocouple polarity.
Keep all unshielded leads short.
Connect the terminal block GND

(#18) to nearest I/O chassis mtg.

bolt with 12 gauge stranded wire.

card
guide

module release,
top and bottom

Connect thermocouple wires to channels 0-3.
We show an example for channel 0. Make sure
both cold junction compensation (CJC) devices
are securely attached with correct polarity.

Important:

Ground all thermocouple shields
to earth ground at I/O chassis
with 3/8º braid wire. See User

CHL 0+

Manual, figure 3.2.

CHL

0±

CHL 1+

1±

CHL

Thermocouple Wire

CJC
Device

Terminal Block

+
±

A

To install your module into the chassis:

1. Turn off the chassis power supply.

If you insert or remove the module while backplane power is
on, an electrical arc can occur. This could cause an explosion
in hazardous location installations. Be sure that power is
removed or the area is nonhazardous before proceeding.

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6 Thermocouple/mV Isolated Input Module

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

located at the top and bottom of the chassis.

3. 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.

4. Cover unused slots with the card slot filler, catalog number 1746–N2.

5. To remove, press the releases at the top and bottom of the module, and slide

the module out of the chassis slot.

card guides

top and bottom
releases

retaining clips

Publication 1746-QS002B-EN-P - July 2002