User’s Manual xLogic SuperRelay
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You can invert output Q3 to use output messages at Q4. Relay Q4 only drops out if main
power is lost or if there is a fault in the system. The output can then be used for a remote
message.
5.4 Factory door
Requirements for a gate control system
In many cases a factory entrance is closed with roll gates. Those gates are only opened
when vehicles need to enter or leave the factory grounds. The gate is controlled by the
porter.