Example Of Wiring Networked Et 200Is Stations - Siemens SIMATIC ET 200iS Manual

Lightning Protection Element for Signal Modules
The protective devices have a shield connecting clamp and the input and output. If
the bus connection is looped through, two protective devices must be used per IM
module. The overload of a lightning protection element is indicated by the
permanent short-circuit (fail-safe) between the signal cores.
Protective Elements for 1 <-> 2 and higher
When installing the ET 200iS, zone transition 1 <-> 2 and higher is not normally
used. If it is required, consult the table above and discuss the required measures
with your Siemens representative.
6.4.5 Example of Protection from Overvoltage for Networked ET 200iS
Stations
Wiring Example
The schematic below shows an example of how to wire two networked ET 200iS
stations to achieve effective protection from overvoltages:
Lightning protection zone 1
Enclosure EEx e
PS
6mm²
(1)
(6)
Figure 6-4 Example of Wiring Networked ET 200iS Stations
ET 200iS Distributed I/O Station
A5E00087831-02
Lightning protection zone 0 , field side
IM EM
(2)
(3)
(4)
PA
B
Enclosure EEx e
Lightning protection zone 1
IM
PS
(2)
(1)
(4)
PA
16mm²
(5)
Wiring
EM
(6)
6mm²
(3)
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