Assembling and Installing Systems
A-21
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
A.5.4 Example Circuit for Surge Protection of Networked S7-400s
Introduction
This section contains an example circuit for the surge protection of S7-400s
networked together.
Numbers in Figure A-5
Table A-4 refers to Figure A-5 and explains the consecutive numbers:
Table A-4 Example of a Configuration Fulfilling Lightning Protection Requirements
(Legend for Figure A-5)
Consec.
No. from
Fig. A-5
Components Meaning
1 DEHNport lightning conductors,
2 - 4 depending on mains system
Order no.: 900 100*
High-voltage protection against direct
lightning strikes and surges from
transition 0 <-> 1
2 2 DEHNguard 275 surge
arresters,
Order no.: 900 600*
High-voltage surge protection at
transition 1 <-> 2
3 In the spur line
1 intermediate adapter
Type FS 9E-PB
Order no.: DSN 924 017
Low-voltage surge protection for RS 485
interfaces at transition 1 <-> 2
In the spur line
1 standard rail 35 mm
with connecting cable
Type ÜSD-9-PB/S-KB
Order no.: DSN 924 064
4 Digital modules:
KT lightning conductor,
Type AD 24 V SIMATIC
Analog modules:
KT lightning conductor,
Type ARE 12 V-
Low-voltage surge protection at inputs
and outputs of the signal modules at
transition 1 <-> 2
5 Shielding the bus cable:
Copper plate
Shielding
Clamp
-
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