| 摘要 |
PURPOSE:To enable to find out failures easily, by monitoring an output signal with a CPU, in a control circuit outputting the output signal through the discrimination of an input signal from a switch at the CPU and operating a driving source. CONSTITUTION:A light emitting diode of an input detection circuit 3a of a control circuit 12 is illuminated with a switch 1a of an input section 11 and inputted to an input circuit 4 as an electric signal at a phototransistor. The result is judged by a CPU5, an output latch circuit 6 drives a power transistor 7a and a power supply B is supplied to a solenoid 9a for operation. When the transistor 7a is in off-state in an output detection circuit 8a, a current of about 20mA flows to a resistor R, a photocoupler P is operated and feedback is made to an input circuit 4 to discriminate if the output circuit system is normal. When no output is indicated and the P is not operated, it is judged as a failure. |
