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  • 1794-IT8
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1794-IT8

Allen-Bradley 1794-IT8 | Flex I/O Thermocouple Input 8-Ch

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  • Manufacturer: Allen-Bradley

  • Product No.: 1794-IT8

  • Product Type: DC Input Module

  • Product Origin: USA

  • Payment:T/T, Western Union

  • Weight: 250g

  • Shipping port: Xiamen

  • Warranty: 12 months

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  • Tallafi na awa 24 a rana, kwana 7 a mako
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Product Overview

The Allen-Bradley 1794-IT8 is an 8-channel Thermocouple/mV Analog Input Module for the Flex I/O system. It supports thermocouple types J, K, E, R, N, S, B, C, T, and L, plus ±76.5mV signals. With 16-bit resolution and 2.384 microvolt typical accuracy, it delivers precise temperature measurement in industrial applications.

Core Functionality

The 1794-IT8 interfaces directly with grounded or ungrounded thermocouples and millivolt transducers. It communicates with PLCs via block transfer programming, moving configuration words and input data between the module and the PLC data table. Two cold-junction compensators mount on the terminal base for accurate reference. The module requires key switch Position 3 on the terminal base for safe mounting.

Technical Specifications

Parameter Value
Part Number 1794-IT8
Series Flex I/O
Module Type Thermocouple/mV Input Module
Inputs 8 channels
Thermocouple Types J, K, E, R, N, S, B, C, T, L
Millivolt Range ±76.5 mV
Resolution 16-bit (2.384 µV typical)
Data Format 16-bit 2's complement or offset binary
Isolation Voltage 850V DC
Normal Mode Rejection -60 dB at 60 Hz
Common Mode Rejection -115 dB at 60 Hz / -100 dB at 50 Hz
Channel Bandwidth 0 to 2.62 Hz
System Throughput 325 ms
Flexbus Current 20 mA
Power Dissipation 3W max @ 31.2V
Thermal Dissipation 10.2 BTU/hr @ 31.2V DC max
Terminal Base 1794-TB2, -TB3, -TB3T
Keyswitch Position 3
CJC Unit Part Number 969424-0
Weight Approx. 0.25 kg (0.55 lbs)

Installation Guide

Rotate the terminal base keyswitch to Position 3 before inserting the 1794-IT8. Mount the two cold-junction compensators (969424-0) in their designated positions on the terminal base. Connect thermocouple or millivolt wiring, observing polarity for ±76.5mV inputs. Configure the module via block transfer programming in the PLC. Ensure 24V DC supply is connected. Supports both grounded and ungrounded thermocouples.

Engineering Advantages

This module supports 10 thermocouple types plus millivolt inputs for maximum application flexibility. 16-bit resolution with 2.384µV typical accuracy ensures precise temperature measurement. -115dB common mode rejection at 60Hz provides excellent noise immunity. 850V DC isolation protects the backplane. The dual cold-junction compensators maintain accurate reference compensation.

Technical FAQs

Q1: Supported thermocouple types and range?
A1: J, K, E, R, N, S, B, C, T, L plus ±76.5mV. Type B: 300-1800°C, Type K: -230 to 1372°C, Type J: -195 to 1200°C.

Q2: What terminal base and keyswitch position?
A2: Compatible with 1794-TB2, -TB3, -TB3T terminal bases. Keyswitch must be in Position 3 for safe mounting.

Q3: Resolution and isolation specs?
A3: 16-bit resolution (2.384µV typical). 850V DC isolation. Throughput 325ms. Flexbus current 20mA.

Product Resources

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🏷️ Tags: DC Input Module

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