| 摘要 |
PURPOSE:To check functions of a control circuit and a processor set to the monitor mode in advance by periodically generating an automatic inspection signal from a monitor part provided in the control circuit and checking whether a prescribed operation corresponding to this signal is performed or not. CONSTITUTION:A control circuit 1 performs the switching processing to switch processors 3-1 to 3-n set to the monitor mode to the operation mode based on the artificial abnormal signal which is inputted from a monitor part 4 at intervals of a prescribed time. When the switching processing is not performed though the monitor part 4 outputs the artificial abnormal signal, the monitor part 4 judges processors 3-1 to 3-n set to the monitor mode or the control circuit 1 to be abnormal and displays trouble. Thus, the abnormality of processors 3-1 to 3-n set to the monitor mode and the control circuit 1 is detected in advance. |
