Operating The S7-400 From A Grounded Supply - Siemens S7-400 Installation Manual

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.
L1
L2
L3
N
PE


L1
N
P
E

AC
AC
AC
DC
Figure 4-1

Operating the S7-400 from a Grounded Supply

S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
Low-voltage distribution e.g. TN-S system (3 x 400 V)
Cabinet
Racks
PS CPU
Ground bus in cabinet


Load circuit
24 to 230 VAC for AC modules


Load circuit 5 to 60 VDC for isolated DC modules
Wiring the S7-400
SM
L +
Data
M
Signal modules
4-7