Wiring and Fitting
5-3
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
24 VDC supply
The following table tells you what you have to do with regard to the 24 VDC supply.
With ...
Pay attention to ...
Buildings Outdoor lightning
protection
Take lightning protection
precautions
24 VDC supply lines,
signal lines
Indoor lightning
protection
(for example, lightning
conductors)
24 VDC supply Safe (electrical) isolation of extra-low voltage
Protection against outside electrical influences
The following table tells you what to do to provide protection against electrical
influences or faults.
With ...
You must ensure that...
All plants or systems in
which the ET 200S is
integrated
The plant or system is connected to a protective
conductor for diverting electromagnetic interference.
Supply, signal, and bus
lines
The wiring arrangement and installation are correct.
Signal and bus lines Any break of a line or conductor does not result in
undefined states of the plant or system.
5.2 Operating the ET 200S on a grounded supply
In this section, you will find information on the overall setup of an ET 200S
distributed I/O system on a grounded supply (TN-S system). The specific subjects
discussed are:
• Circuit-breaking devices, short-circuit and overload protection in accordance
with DIN VDE 0100 and DIN VDE 0113
• Load power supplies and load circuits
Definition: Grounded mains
In a grounded supply, the neutral conductor of the system is grounded. A mere
ground fault between a live conductor and ground or a grounded section of the
plant causes the protective devices to trip.
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