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5.6 Power supply
A marked and easily accessible current limiting switch has to be arranged in the vicinity of
the device for turning off the power supply. Fusing should be 10 Amps or less and must be
rated for the available voltage and fault current.
5.7 Relays
When the device is switched off the relay contacts are de-energized, but dangerous
voltages may be present.
The relay X2 is part of the basic unit and therefore always available.
The relays X5 and X6 are provided for device versions with I/O
extension PCB only.
The plug-in terminals have different colours to prevent mixing up the
connections. The pin assignment is the same for all relays: