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 o f an indication output connection which the PLC can sense to determine that th e 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.