Assembling and Installing Systems
A-28
Automation System S7-400 Hardware and Installation
A5E00850741-01
A.9.4 Sample of a Surge Protection Circuit for Networked S7-400
PLCs
Sample Circuit
The sample in the figure A-7 shows you how install an effective surge protection for
2 networked S7-400 PLCs:
CPUSV
10 mm
2
PE
Switchgear cubicle1
L1
L2
L3
N
PE
Lightning-protection 0, field side zone
Lightning-protection zone 1
Lightning-protection zone 2
SM
MPI
CPUSV
10 mm
2
PE
Switchgear cubicle 2
SM
MPI
Lightning-protection zone 2
Figure A-7 Sample Circuitry for Networked S7-400 PLCs
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