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    m_c's Avatar
    Lives in East Lothian, United Kingdom. Current Activity: Viewing Has been a member for 9-10 years. Has a total post count of 1,792. Received thanks 189 times, giving thanks to others 5 times.
    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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