Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules - Manual (Page 60)

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
μ
F
IN_x/V
A/D Converter
7500
Ω
IN_x/I/SRC
1000
Ω
55
Ω
4…20 mA
Transmitter
0.01
μ
F 0.01
μ
F
1000
Ω
20
Ω
0.01
μ
F
0.01
μ
F
Current Limit
24.9
Ω
25
Ω
Current Limit
i_sense
2.5V Vref
PGA
+18V +18V
+
–