Siemens Simatic S7-400

Wiring the S7-400
4-14
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
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
www.PLCworld.cn
长沙工控帮教育科技有限公司整理
www.gkbpx.com