For Additional Information; What This Chapter Contains; What The Flex Ex Thermocouple/Rtd/Mv Modules Do; How Flex Ex Thermocouple/Rtd/Mv Modules Communicate With Programmable Controllers - Rockwell Automation Allen-Bradley FLEX Ex 1797-IRT8 User Manual

What this Chapter
Contains
What the FLEX Ex
Thermocouple/RTD/mV
Modules Do
1
About the FLEX Ex Thermocouple/RTD/mV
Input Module
Read this chapter to familiarize yourself with the 1797-IRT8 input
module.
For information on:
What the FLEX Ex Thermocouple/
RTD/mV Modules Do
How FLEX Ex Thermocouple/RTD/mV
Modules Communicate with
Programmable Controllers
Features of Your Module
Chapter Summary
The 1797-IRT8 module accepts up to 8 thermocouple, RTD or mV
inputs. The inputs are nonisolated and are selected with analog
multiplexers which have a common-mode input range of -0.5 to +3.6
volts. The inputs will accept a millivolt or resistive input. Default input
spans are –40.00mV to +100.00mV or 0.00 to 500.00 ohms. Fault
Indicators are located on the field side.
No switches or jumpers are used on the thermocouple/RTD/mV input
module. The Inputs have both fixed hardware filters and selectable
firmware digital filters.
This module offers:
• local microprocessor intelligence for advanced features
• full functionality without switches or jumpers
• multiple data ranges that can be independently programmed in
channel groups
• lead breakage detection
• overrange/underrange alarms
as well as a host of other module features.
See page:
1-1
1-2
1-2
1-5
Publication 1797-6.5.2 - February 2001
1
Chapter