AN ELECTRONIC MEANS TO SENSE ACTUATION OF AC OUTPUT CONTROL CIRCUITRY

摘要

The present invention provides a circuit for isolating an AC actuated device and detecting its actuation via a digital controller which controls the actuation. The circuit comprises an optocoupler or other suitable means for isolating an AC actuated device, or load, from a DC microcontroller or PLC; a diode network allowing current flow in first and second directions and for biassing the light emitter of the optocoupler; actuation switch between the device and the diode network which is controlled by the PLC and; resistorcapacitor (RC) charge and discharge paths connected between the phototransistor output of the optocoupler and the PLC to vary the state of of an indication output connection which the PLC can sense to determine that the device is actuated. The invention may further comprise suitable biassing and limiting resistors, connection points, DC power supplies and the like as necessary or desirable.