Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 12)

Publication 1746-UM008B-EN-P - December 2006
12 Overview
Simplified RTD Module Circuit
RT D
µP Circuit
RT D
0
Sense
Return
I
C= 0.5 or 2 mA
Constant Current Source
A/D
Conversion
Digital Data
Backplane
RT D
1
RT D
2
RTD Module
RT D
3
Digital Data
RT D
Sense
Return
RT D
Sense
Return
RT D
Sense
Return