Sample Configuration; D-2 Example Showing Lightning Protection For The Et 200 Distributed I/O System - Siemens SIMATIC S5 Manual

The ET 200 distributed I/O system and lightning protection
Sample
configuration
L1 L2 L3 N PE
PE
Figure D-2 Example showing lightning protection for the ET 200 distributed I/O system
D-8
Fig. D-2 is an example showing how the distributed I/O system must be
configured for effective protection against overvoltage surges:
Lightning-protection zone 0, field side
Lightning-protection zone 1
Cabinet 1
Lightning-protection zone 2
PS, IM
CPU 308-C
A
B
2
10 mm
Cabinet 2
Lightning-protection zone 2
Slave
2
6 mm
A
B
PE
ET 200 Distributed I/O System
2
10 mm
EWA 4NEB 780 6000-02a