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Overview
The FLEX System
Adapter
Types of Modules
Overview of FLEX I/O and Your Thermocouple,
RTD, and Millivolt Input Module
This chapter provides a description of the FLEX I/O Thermocouple, RTD, and Millivolt Input module
and an overview of how it communicates with programmable controllers.
FLEX I/O is a small, modular I/O system for distributed applications that performs all functions of
rack-based I/O. The FLEX system contains the following components shown:
+
+
•
Adapter – Transfers read and write configuration data to and from the I/O module.
•
Terminal base – Contains a terminal strip to terminate wiring for two- or three-wire devices.
•
I/O module – Contains the bus interface and circuitry that is needed to perform specific
functions that are related to your application.
The FLEX system consists of an adapter, terminal base unit, DIN rail, power supply, and adapter
cabling components. You can use up to eight terminal bases per adapter.
For detailed instructions on how to set up and install your module, see
Module on page
11.
The module refers to the following catalogs:
Catalog Number
1794-IRT8
1794-IRT8XT
The module accepts up to eight thermocouple or RTD inputs. The inputs are nonisolated and are
selected with analog multiplexers. The inputs accept millivolt or resistive inputs. Default input
spans are -40.00 mV... +100.00 mV or 0.0...500.0 Ω. Fault indicators are located field side.
No switches or jumpers are used on the TC and RTD Input module. The inputs have both fixed
hardware filters and selectable firmware digital filters.
Rockwell Automation Publication 1794-UM012D-EN-P - March 2023
Terminal base
Voltage
Inputs
Description
Analog – 8 pt, 16 bit non-isolated RTD, thermocouple, and mV
24V DC
8
Input module
Analog – 8 pt, 16 bit non-isolated RTD, thermocouple, and mV
24V DC
8
Input module designed for extended temperature.
1
Chapter
I/O module
Install Your FLEX I/O Input
7
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