Wiring
5-3
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
Note on Radio Interference
When several electronic components are used within a switch cabinet, the radio
interference can overlap. As a result, the permissible level of radio interference
intensity in the overall configuration may be exceeded.
Tip: Space these modules out as much as possible and, if necessary, use shielded
cables or filters in the supply lines or switch cabinets with greater resistance to
radio frequency.
Mains Voltage
The following table shows you what to remember about mains voltage.
With ... Guidelines
Permanently installed plants or
systems without all-pole supply
isolating switches
There must be a supply isolating switch or a
fuse in the building installation system
Load power supplies, power
supply modules
The system voltage range set must
correspond to the local system voltage
All ET 200M circuits Any fluctuations in or deviations from the
rated input/load voltage must be within the
permissible tolerances (see the technical
specifications of the S7-300 modules)
24V DC Power Supply
The following table shows you what to remember about the 24 V supply.
With ... Pay Attention to ...
Buildings Outdoor lightning protection Install lightning
24 V DC power supply
cables, signal cables
Indoor lightning protection
protection (e.g.
lightning
conductors).
24 V power supply Safe electrical isolation of safety extra-low voltage
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