Siemens Simatic S7-300 - Sample of a Surge Protection Circuit for Networked S7-300 Plcs

Appendix
S7-300 Programmable Controller Hardware and Installation
11-26 A5E00105492-01
11.3.5 Sample of a surge protection circuit for networked S7-300 PLCs
Sample circuit
The sample in the figure below shows you how install an effective surge protection
for 2 networked S7-300 PLCs:
CPUSV
10 mm
2
PE
Switchgear cubicle1
L1
L2
L3
N
PE
Lightning-protection 0, Field sidezone
Lightning-protection zone 1
Lightning-protection zone 2
SM
MPI
CPU
SV
10 mm
2
PE
Switchgear cubicle2
SM
MPI
Lightning-protection zone 2
1
4
5
3
6
2
4
2
5
4
4
6
3
7
3
Figure 11-7 Sample circuitry for networked S7-300 PLCs