Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules - Manual (Page 58)

58 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Chapter 3 1756-IF8I Isolated Analog Input Module
Module Block and
Circuit Diagrams The graphics in this section show the 1756-IF8I module’s block diagrams and
field-side circuit diagrams.
Figure 5 - 1756-IF8I Module Block Diagram
RIUP
Circuit
DSP
Field Side Backplane Side
1
7
5
6
B
A
C
K
P
L
A
N
E
Channels 1…6 (not shown)
Backplane
ASIC
DC-DC
Shutdown
Circuit
System
+5V
Isolator
DC-DC
Converter
Vref
Signal Conditioning
and A/D Converter
Isolated Power
Channel 0
Channel 7
IN_0/V
IN_0/I/SRC
RTN_0
Isolator
DC-DC
Converter
Vref
Signal Conditioning
and A/D Converter
Isolated Power
Nonvolatile
Memory
Status
Indicators
IN_7/V
IN_7/I/SRC
RTN_7
Represents Channel Isolation