Classified by the type of external power supply circuit for the DC input DC input a form of circuit (shown only one input circuit). When an external line switch is closed, the internal PLC communication modules plc LED lights, phototransistor saturated conduction, then send the on plc sequence of events module processor so that the CPU that the road signal input; switch off when the outside light the light-emitting diode coupled off, phototransistor deadline, CPU that the road no signal.
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