Wiring the S7-400
4-4
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
Protection Against Other Electrical Effects
The following table shows the other external effects against which you must
provide protection.
Protection against ... ... by means of ...
inadvertent actuation of
operator controls
a suitable arrangement or covering of keyboard and
operator controls or a recessed arrangement of operator
controls.
splashing and surging water suitable protective devices or installation in waterproof
housings.
direct solar radiation suitable shading or installation in appropriately sheltered
locations.
mechanical damage suitable demarcation, protective devices, or installation in
rugged housings.
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