Sample Of A Surge Protection Circuit For Networked S7-300 Plcs - Siemens SIMATIC S7-300 Hardware And Installation Manual

Appendix
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:
L1 L3 PE
N
L2
Lightning-protection zone 2
1
PE 10 mm
Figure 11-7 Sample circuitry for networked S7-300 PLCs
11-26
Lightning-protection
Lightning-protection zone 1
2
Switchgear cubicle1
SV CPU SM
4
MPI
4
3
2 5
0, Field side
zone
2
Lightning-protection zone 2
SV CPU
MPI
2
10 mm
PE
6
3
S7-300 Programmable Controller Hardware and Installation
Switchgear cubicle2
SM
4
4
5
6
3
7
A5E00105492-01