Siemens SIMATIC S7-400 Hardware And Installation Manual page 66

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