| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable a power source supplied to each control board to be retained for a fixed time upon power interruption, and to thereby enable an output signal from a first control board 7A to be reliably inputted into a second control board 7B.SOLUTION: When power interruption detection means 20 detects power interruption, a supply voltage from first power source generation means 12 to the first control board 7A is lowered to a predetermined standby voltage and retained for a prescribed time, and back-up to the first control board 7A and output of control information to the second control board 7B are performed during this period. Power supply to the first control board 7A is interrupted by output of a disconnection signal after the prescribed time, and a supply voltage from second power source generation means 13 to the second control board 7B is lowered to a predetermined standby voltage and retained for a prescribed time, and back-up to the second control board 7B is performed during this period.</p> |
