Hirschmann RS20 series User Manual page 14

 When the temperature under rated conditions exceeds 70 °C at the
cable or conduit entry point, or 80 °C at the branching point of the
conductors, the temperature specification of the selected cable and
cable entries shall be in compliance with the actual measured
temperature values.
 Make provisions to prevent the voltage of the rated voltage
connections from exceeding the 119 V threshold due to transient
disturbances.
 Connectors shall be connected or disconnected exclusively in dead-
voltage state.
 DIP switches must be actuated in
 The USB port shall remain disconnected.
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de-energized stated only.
Installation RS20/22/30/32/40
Release 05 12/2015