3-3
ET 200L Distributed I/O Device
EWA-4NEB 780600902-05
The following table shows the points that you have to take into account in
respect of the 24 VDC supply.
With ... Pay Attention to...
Buildings Outdoor lightning
protection
Take lightning protec
tion precautions – for
24 VDC supply lines,
signal lines
Indoor lightning protec-
tion
example, lightning
conductors
24 VDC supply Safe (electrical) isolation of extra-low voltage
The following table shows you the items you have to take into account in
respect of protection against electrical phenomena or faults.
With ...
Pay Attention to:
Any plant or system in
which the ET 200L is
installed
Is the plant or system connected to a protec-
tive conductor for diverting electromagnetic
interference?
Connecting leads, signal and
bus lines
Are the wiring arrangement and installation
correct?
Signal and bus lines Any break of a line or conductor must not
result in undefined states of the plant or sys-
tem.
24 VDC Supply
Protection Against
External Electrical
Phenomena
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