Wiring the S7-400
4-6
Automation System S7-400 Hardware and Installation
A5E00850741-01
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 s upply 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
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