The PLC option is designed to provide a contact close (or open) to your PLC though a communications cable.


The PLC output option consists of a circuit board and a communications cable to connect to your PLC. Since 24VDC power is usually available at a PLC, it is convenient to power the circuit board by the available 24VDC. If you have other voltages, or want to run from battery power, talk to us.

The circuit board inside the electronics enclosure allows for a local buzzer and LED, in addition to the signal sent to your PLC.

Different behaviors are set with jumpers; you can select N.O or N.C. relay output. You can choose if there is a snooze alarm or not, (after pressing the button to silence the buzzer).  Or if the LED should continue to blink after the silencing button is pressed. Also the orientation of the input (usually a float switch) can be changed from high to low.

We connect to your PLC by a 4-conductor x 24 AWG communications type cable with 0.032″ outer jacket thickness. Default length is 10 ft., and longer lengths can be ordered by the foot.

If an optional screw-lock connector is ordered, then it is pre-wired from the factory. We use with an 8-conductor x 24AWG  cable which has 4 unused conductors. These can be used to detect a broken cable by your PLC.  By default, our device will alarm if the screw connector is disconnected from the device.