Siemens S7-400 - Operating the S7-400 from a Grounded Supply

Wiring the S7-400
4-7
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
S7-400 in the Overall Installation
Shown in Figure 4-1 is the position of the S7-400 in the overall installation (load
current power supply and grounding concept) with supply from a TN-S system.
Note: The arrangement of supply terminals shown is not the actual arrangement; it
has been chosen for reasons of clarity.
Ground bus in cabinet
N
L1
L +
M
PS CPU
L1
L2
L3
N

Load circuit
24 to 230 VAC for AC modules
Load circuit 5 to 60 VDC for isolated DC modules
Cabinet
AC
AC

AC
DC

Signal modules
Low-voltage distribution e.g. TN-S system (3 x 400 V)
PE

SM
Racks
P
E
Data


Figure 4-1 Operating the S7-400 from a Grounded Supply