Potentials On The Et 200Is; Power Supply Module - Siemens SIMATIC ET 200iS Manual

Wiring

Power supply module

1L+
2L+
1M
2M
Powerbus
1PA 1PA
2PA 2PA
Figure 6-2 Potentials on the ET 200iS
6.4 Lightning and Overvoltage Protection
6.4.1 Overview
Introduction
One of the most common causes of failure is overvoltage caused by:
• Atmospheric discharge or
• Electrostatic discharge
First, will show the basis of the theory of overvoltage protection: The lightning
protection zone concept.
We will then outline the rules for the transitions between the individual lightning
protection zones.
6-6
Backplane bus ET 200iS
Electronics modules
IM 151-2
Logic,
bus
Process Process
DP
electronics
electronics
interface
Bus termination
module
Bus interface
DIN rail
Electrical
isolation
Process
electronics
Potential powerbus
Potential DP interface
Potential I/O EEx i
Potential logic EEx i
ET 200iS Distributed I/O Station
A5E00087831-02