User Manual

60 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Chapter 3 1756-IF8I Isolated Analog Input Module
Figure 8 - 1756-IF8I Module Field-side Circuit with the Module Sourcing the Current Input Loop
RTN-x
0.1 μF
IN_x/V
A/D Converter
7500 Ω
IN_x/I/SRC
1000 Ω
55 Ω
4…20 mA
Transmitter
0.01 μF0.01 μF
1000 Ω
20 Ω
0.01 μF
0.01 μF
Current Limit
24.9 Ω
25 Ω
Current Limit
i_sense
2.5V Vref
PGA
+18V
+18V
+
–