The cable is used to connect a PLC to the Heat Station power supply. For R type power supplies the PLC can be used to control on and off and the front panel power control can be preset at the desired power level or an internal switchcan be flipped to disable front panel power control (power display remains functional) and the PLC assumes control of time and power. For RC power supplies on/off can be controlled by the PLC with time and power controlled on the front panel or an internal switch is flipped to disable front panel time and power control (power display remains functional) and the PLC assumes control of time and power. For either unit type the PLC controls power by means of a 0-10 VDC analog output. (0 = minimum, 10v = maximum power) and on and off is accomplished with a 12 VDC circuit by means of a SPDT relay output, or one PLC output can be designated for on and one for off (12v for the circuit is supplied by the Heat Station power supply). An independent circuit monitors power and sends a DC voltage back to the PLC. (0.1 volt per 100 watt output with 2.5 volts being maximum power), or a relay output can complete a user supplied circuit when the a selected power level is reached.