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09-10-2017 #7
Without re-reading the entire thread, NPN means it's switches the signal wire to ground.
So connect the sensor +VE to 24V, then the Gnd/0V to both the 24V supply GND/0V, and the BOB GND/0V (best to join both power supply GNDs at a common point).
Then connect the sensor signal wire to the Gnd/0V/- side of the opto input, and 5V to the 5V/+ side of the opto input.Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
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