| 摘要 |
PURPOSE:To enable a CPU in normal condition to carry out manual/automatic operation and in abnormal condition to carry out manual operation by connecting a control section and a main driving circuit in response to the output of a watch dog. CONSTITUTION:A watch dog IC9 detects the abnormality of a CPU2 in response to the abnormality of clock from the clock terminal CLK. When CPU2 is in a normal condition, a transistor T5 is turned on and transistor T10 is turned off, so when T1-T4 are ready to operate and each motor 5 or 6 is driven by only an instruction from the CPU2. When the CPU2 is in an abnormal condition and transistor T10 is turned on and transistor T5 is turned off, T6-T9 are ready to operate, so neither motor 5 nor motor 6 is not driven by an instruction fro the CPU2, but motor 5 or 6 is driven by each signal from manual switch 4. |
