Allen-Bradley 1794-IT8 Installation Instructions Manual
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Allen-Bradley 1794-IT8 Installation Instructions Manual

Allen-Bradley 1794-IT8 Installation Instructions Manual

24v dc flex i/o thermocouple/mv input module
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24V dc FLEX I/O
Thermocouple/mV Input Module
(Cat. No. 1794-IT8)
4
Module Installation
This module mounts on a 1794 terminal base unit.
1. Rotate keyswitch (1) on terminal base unit (2) clockwise to position
as required for this type of module.
2. Make certain the flexbus connector (3) is pushed all the way to the left
to connect with the neighboring terminal base/adapter. You cannot
install the module unless the connector is fully extended.
3. Make sure that the pins on the bottom of the module are straight so
they will align properly with the connector in the terminal base unit.
4. Position the module (4) with its alignment bar (5) aligned with the
groove (6) on the terminal base.
5. Press firmly and evenly to seat the module in the terminal base unit.
The module is seated when the latching mechanism (7) is locked into
the module.
FLEX I/O is a trademark of Rockwell Automation
Installation Instructions
3
Allen-Bradle
7
1
2
6
5
Publication 1794-5.21 – May 1999
3

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Summary of Contents for Allen-Bradley 1794-IT8

  • Page 1 Installation Instructions 24V dc FLEX I/O Thermocouple/mV Input Module (Cat. No. 1794-IT8) Module Installation This module mounts on a 1794 terminal base unit. 1. Rotate keyswitch (1) on terminal base unit (2) clockwise to position as required for this type of module.
  • Page 2 EN 61131–2 Programmable Controllers, Part 2 – Equipment Requirements and Tests. For specific information required by EN 61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications: Industrial Automation Wiring and Grounding Guidelines For Noise Immunity, publication 1770-4.1...
  • Page 3 24V dc FLEX I/O Thermocouple/mV Input Module 3 Wiring 1. Connect the individual high and low signal wiring to numbered terminals on the 0–15 row (A) on the terminal base unit as indicated in the wiring table. 2. Connect 24V dc common to terminal 16 on row (B). ATTENTION: You must power this module from the same power supply that supplies the adapter module so they both power up or down together.
  • Page 4 24V dc FLEX I/O Thermocouple/mV Input Module 8. Connect the shield to functional earth ground as near as possible to the module. 8 9 10 11 12 13 14 15 0 –15 16–33 34–51 1794-TB2, TB3, -TB3T Shaded terminals not included on 1794-TB2 terminal base unit. Note: Use 1794-TB3T or -TB3TS base units for thermocouple or millivolt inputs.
  • Page 5 24V dc FLEX I/O Thermocouple/mV Input Module 5 1794-TB3T or -TB3TS Terminal Base Unit Thermocouple Thermocouple High Signal Low Signal Shield Channel Not Used Term. (+) Term. (–) Return 17(C) 19(C) 21(C) 23(C) 25(C) 27(C) 29(C) 31(C) 24V dc Common 16, 17, 19, 21, 23, 25, 27, 29, 31 and 33 +24V dc power 34, 35, 50 and 51...
  • Page 6 16–33 34–51 1794-TB3 Millivolt Millivolt input Source – Channel 1 Channel 0 (Terminals 0, 1 and 17) Indicators Allen-Bradley 1794–IT8 THERMOCOUPLE INPUT 8 CHANNEL INPUT 0 INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 INPUT 6 INPUT 7 –...

  • Page 7: Output Mapping

    24V dc FLEX I/O Thermocouple/mV Input Module 7 Block Transfer Read and Write The following block transfer read and write word bit information is presented for experienced users only. Refer to the user manual publication 1794-6.5.7 for this product for complete information on programming and configuring your module.

  • Page 8: Thermocouple Type

    24V dc FLEX I/O Thermocouple/mV Input Module Thermocouple Type Word Description Thermocouple Type – Range Channel 0 Write Word 1 Word 1 Channel 1 Channel 2 Channel 3 Channel 4 Write Word 2 Word 2 Channel 5 Channel 6 Channel 7 Millivolts (default) 300 to 1800 (572 to 3272...
  • Page 9 24V dc FLEX I/O Thermocouple/mV Input Module 9 Data Type Word Description Module Data Type Write Word 0 Word 0 Definition C (default) Bipolar counts scaled between –32768 and +32767 (default) Unipolar counts scaled between 0 and 65535 Publication 1794-5.21 – May 1999 Allen-Bradle...

  • Page 10: Csa Hazardous Location Approval

    Example of the CSA certification product label To comply with CSA certification for use in hazardous locations, the following information becomes a part of the product literature for CSA-certified Allen-Bradley industrial control products. This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D, or non-hazardous locations only.
  • Page 11 Do not disconnect connectors unless power has been switched off or the area is known to be non-hazardous. Secure any user-supplied connectors that mate to external circuits on an Allen-Bradley product using screws, sliding latches, threaded connectors, or other means such that any connection can withstand a 15 Newton (3.4 lb.)

  • Page 12: Approbation D'utilisation Dans Des Emplacements Dangereux Par La Csa

    Attacher tous connecteurs fournis par l’utilisateur et reliés aux circuits externes d’un appareil Allen-Bradley à l ’aide de vis, loquets coulissants, connecteurs filetés ou autres moyens permettant aux connexions de résister à une force de séparation de 15 newtons (3,4 lb.
  • Page 13 24V dc FLEX I/O Thermocouple/mV Input Module 13 Specifications – 1794-IT8 Thermocouple/mV Input Module Number of Inputs 8 Channels Module Location Cat. No. 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS Terminal Base Unit Nominal Input Voltage Ranges +76.5mV Supported Thermocouple Types Type B: 300 to 1800...
  • Page 14 24V dc FLEX I/O Thermocouple/mV Input Module Specifications – 1794-IT8 Thermocouple/mV Input Module Gain Drift with Temperature 10ppm/ C maximum Overall Drift with Temperature 50ppm/ C of span (maximum) Cold Junction Compensation 0 to 70 range Cold Junction Compensator Kit Cat. No. 1794–CJC2/A (contains 2 CJCs)

  • Page 15: Derating Curve

    24V dc FLEX I/O Thermocouple/mV Input Module 15 Derating Curve 31.2 24.0 19.2 C 50 C 55 Safe operating area Ambient Temperature The area within the curve represents the safe operating range for the module under various conditions of user supplied 24V dc supply voltages and ambient temperatures. User Manuals Thank you for purchasing this product.
  • Page 16 1201 South Second Street, Milwaukee, WI 53204 USA, Tel: (1) 414 382-2000 Fax: (1) 414 382-4444 Publication 1794-5.21 – May 1999 Publication 1794-5.21 – May 1999 PN955127–47A Supersedes publication 1794-5.21 – April 1997 Copyright 1999 Allen-Bradley Company, Inc. Printed in USA...

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