Wiring
4-3
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
24 VDC supply
The following table shows you the items you have to take into account in respect of
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 external electrical phenomena
The following table shows you the items you have to take into account in respect of
protection against electrical phenomena or faults.
With ... Make sure that ...
Any plant or system in
which the ET 200X is
installed
The plant or system is connected to a protective
ground 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.
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