Simplified Representation Of Configuration With Isolated Modules - Siemens SIMATIC S7-400 Installation Manual

Configuration with Isolated Modules
Shown in Figure 4-4 are the potentials of an S7-400 configured with isolated input
and output modules.
L1
N
PE
Ground bus in cabinet
L +
M
external
24 VDC load current PS
Figure 4-4

Simplified Representation of Configuration with Isolated Modules

Automation System S7-400 Hardware and Installation
A5E00850741-01
Rack
PS CPU
DI DO
230 VAC load current PS
Wiring the S7-400
U
internal
Data
L1
N
4-11