Siemens S7-400 - Simplified Representation of Configuration with Isolated Modules

Wiring the S7-400
4-12
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
Configuration with Isolated Modules
Shown in Figure 4-4 are the potentials of an S7-400 configured with isolated input
and output modules.
PS CPU
L1
N
24 VDC load current PS
M
external
L +
U
internal
Reference
potential M
Data
L1
N
DI DO
PE
230 VAC load current PS
Ground bus in cabinet
Racks
Figure 4-4 Simplified Representation of Configuration with Isolated Modules