D.3 Example Illustrating Lightning Protection For The Et 200 Distributed I/O System - Siemens SIMATIC S5 Manual

D.3 Example illustrating lightning protection for the ET 200 distributed
I/O system
Introduction This section contains an example illustrating how the ET 200 distributed I/O
system can be protected against overvoltage surges.
Components for
Table D-3 refers to Fig. D-2 and clarifies the items referred to by their serial
lightning protec-
numbers:
tion
Table D-3 Example of configuration with adequate lightning protection (legend for
1
2
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
The ET 200 distributed I/O system and lightning protection
Fig. D-2)
Ser. No. Component
from Fig.
D-2
1 Lightning diverter to suit mains
system; 2 to 4 pcs. DEHNport
Order No.: 900 100
2 Overvoltage diverter, 2 pcs.
DEHNguard 275
Order No.: 900 600
3 Digital modules
Blitzductor KT, Type AD 24 V
SIMATIC
Analog modules
Blitzductor KT, Type ARE 12 V
4 In dropline
1 pc. adapter type FS 9E-PB
Order No.: DSN 924 017
1 pc. 35 mm top-hat rail with
cable, type ÜSD-9-PB/S-KB
Order No.: DSN 924 064
5 Bus cable shielding:
Copper plate
Î Î Î
Î Î Î
Clamp
6 Potential equalization cable, 16 mm
7 Blitzduktor KT, type AHFD, for
building transition
Order No.: DSN 919 270
Order components directly from: DEHN + Soehne, Elektrotechnische Fabrik,
Hans-Dehn-Str. 1, 92318 Neumarkt, Germany
Order numbers as per catalog Service XV 10. The order number for this catalog is
E89700-S1034-X-A3.
Purpose
Coarse protection against direct
lightning strike and overvoltage
1
at interface 0
Coarse protection against
overvoltage
1
at interface 1
Fine protection against
overvoltage at inputs and
outputs of the DP slaves at
interface 1
Fine protection against
overvoltage for RS 485
interfaces at interface 1
2
2
Shield
2
Fine protection against
overvoltages for RS 485
interfaces at interface 0
2
1
2
2
2
–
–
1
D-7
D