| 摘要 |
PURPOSE:To provide a relay control circuit capable of controlling a relay even when abnormality occurs in a CPU. CONSTITUTION:At the time of the normal action of a CPU 2, when a switch 1 is turned ON to input an input signal TS, a motion signal CS is outputted from the CPU 2. Outputting a control signal OS from a negative OR circuit 4b acts a relay 5. At the time of the abnormal action of the CPU 2 is detected by an observation circuit 3 to output an abnormality detection signal WS. When the switch 1 is turned ON to input the input signal IS, an output signal AS is outputted from an AND circuit 4a. A control signal OS is outputted from the negative OR circuit 4b to act the relay 5. Consequently the relay 5 can be controlled by detecting the condition of the switch 1 even when abnormality occurs in the CPU 2. |
