Allen-Bradley 1794 - Page 34

Publication 1794-RM001G-EN-P - December 2011
3-12 FLEX I/O Modules
Wiring the RTD Input Module
In addition to following the General Considerations when using Any FLEX
I/O Analog Input Module on page 3-7, before wiring the module, consider
the following application guideline:
• RTDs cannot be wired in parallel without severely affecting their
accuracy. Two sensors must be used.
Figure 3.11 FLEX I/O Analog RTD Module Wiring
RTD
Input Module
RTD
Input Module
Thermocouple/
RTD/mV
Input Module
Thermocouple/
RTD/mV
Input Module
1794-TB3T
1794-TB3T
1794-TB3G
1794-TB3G
1794-IR8
1794-IR8
1794-IRT8
1794-IRT8
4-Wire RTD
3-Wire RTD
Note: 2, 3, or 4-wire RTDs can be used as applicable to the associated RTD input module.