Sample Circuit For Networked S7-300 Plcs - Siemens CPU 313C Hardware And Installation Manual

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The sample in the figure below shows you how install an effective surge protection
for 2 networked S7-300 PLCs:
L1 L3 PE
L2 N
Lightning-protection zone 2
1
PE
Figure 12-7 Sample circuit for networked S7-300 PLCs
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
Lightning-protection zone 0, field side
Lightning-protection zone 1
2
Switchgear cubicle 1
SV CPU SM
MPI
3 5
2
10 mm
Lightning-protection zone 2
SV
4
4
PE 10 mm
6
$SSHQGL[
2
Switchgear cubicle 2
CPU SM
4
MPI
4
5
2
3
3
6
7
12-25