| 摘要 |
PROBLEM TO BE SOLVED: To check whether power is supplied or interrupted in both of a main control circuit and a sub-control circuit or either of them.SOLUTION: A sub-control circuit has power supply determination processing means regarding a main power interruption detection signal and a main power supply signal inputted from a main control circuit as output information. The power supply determination processing means stores information on power supply as history information when the output information is a main power supply signal and first output information. When the main power supply signal is not the first output information, the power supply determination processing means stores information on main power supply as the history information, and stores information on occurrence of main power interruption as history information when a main power interruption detection signal is inputted. When the output information is not a main power supply signal and is the first output information, the power supply determination processing means changes information on the latest power interruption to the information on occurrence of sub-power interruption and stores information on the sub-power interruption/supply as the history information. |
