User Manual

88 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Chapter 4 1756-IRT8I Combined Temperature-sensing Isolated Analog Module
Field-side Circuit Diagrams
The following diagrams show the field-side circuitry for the 1756-IRT8I module.
Figure 14 - 1756-IRT8I Module Field-side with 3-wire RTD Input
Figure 15 - 1756-IRT8I Module Field-side with 4-wire RTD Input
0.1 μF
IN_x/RTD D
A/D Converter
IN_x(+)/A
1000 Ω
10 Ω
0.01 μF0.01 μF
1000 Ω
10 Ω
RTD
0.01 μF
0.01 μF
IN_x(-)/B
IN_x/RTD C
I exc
600 μA
I exc
600 μA
2.5V Vref
PGA
0.1 μF
IN_x/RTD D
A/D Converter
IN_x(+)/A
1000 Ω
10 Ω
0.01 μF0.01 μF
1000 Ω
10 Ω
RTD
0.01 μF
0.01 μF
IN_x(-)/B
IN_x/RTD C
I exc
600 μA
2.5V Vref
PGA