Assembling and Installing Systems
A-22
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
Table A-4 Example of a Configuration Fulfilling Lightning Protection Requirements
(Legend for Figure A-5)
Consec.
No. from
Fig. A-5
MeaningComponents
6 Equipotential bonding cable 16
mm
2
-
7 KT lightning conductor, Type
AHFD,
for building entry point,
Order no.: DSN 919 270
Low-voltage surge protection for RS 485
interfaces at transition 0 <-> 1
Example Circuit
Figure A-5 gives an example of how to interconnect 2 networked S7-400s in order
to achieve effective protection against surges:
CPUPS
10 mm
2
PE
Ã
Control Cabinet 1
L1
L2
L3
N
PE
À
Ä
Lightning protection zone 0, field side
Lightning protection zone 1
Lightning prot. zone 2
SM
Á
MPI
CPUPS
10 mm
2
PE
Ã
Control Cabinet 2
Å
SM
Á
MPI
Â
Lightning prot. zone 2
ÄÄ
Æ
Â
Ã
Ã
Å
Figure A-5 Example of Connecting Networked S7-400 Devices
www.PLCworld.cn
To Next Page
Loading...
