Grounding Concept For The S7-300 (Excluding Cpu 31Xc) - Siemens SIMATIC S7-300 Hardware And Installation Manual

Configuring
Note: The arrangement displayed does not correspond with the physical
arrangement; it was merely selected to give you a clear overview.
L1
L2
L3
N
PE
Rail
AC
AC
AC
DC
AC
DC
Figure 5-14 Grounding concept for the S7-300 (excluding CPU 31xC)
5-30
low-voltage distribution
e. g. TN-S System (3 x 400 V)
cabinet
CPU
PS
µP
L1
L +
M
N M
Ground bus in cabinet
AC 24 to 230V load circuit for AC modules
DC 5 to 60V load circuit for non-isolated
DC modules
DC 5 to 60V isolated for
DC modules
S7-300 Programmable Controller Hardware and Installation
SM
Signal modules
A5E00105492-02