Siemens CPU 312C Hardware And Installation Guide

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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Direct lightning strikes occur in lightning protection zone 0. Lightning strike
generates high-energy electromagnetic fields which can be reduced or eliminated
from one lightning protection zone to the next by suitable lightning protection
elements/measures.
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In lightning protection zones 1 and higher, a lightning strike might additionally
cause overvoltage as a result of switching operations, coupling etc.
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The figure below shows a block diagram of the lightning protection zone concept
for a detached building.
Lightning-protection zone 0 (field side)
Lightning-prot. zone 2
Lightning-protection zone 1
Line in information system
Line in
power
system
Internal
line
Metal
part
Lightning-
protection
zone 3
Device
Lightning-
protection equal
Local potential
equal
Building shield
(Steel reinforcing)
Room shield
(Steel reinforcing)
Device shield
(Metal casing)
Non-electric
line (metallic)
External
lightning
protection
Figure 12-6 Lightning protection zones of a building

Siemens CPU 312C Specifications

General

Brand	Siemens
Model	CPU 312C
Category	Processor
Language	English