| 摘要 |
<p>PURPOSE:To improve protection of data required for restoration of a main power source even in the case of the occurrence of a power break of the main power source and to prevent a bad influence upon a system at the time of power switching from the main power source to an auxiliary power source. CONSTITUTION:A first report means 9 which reports it to a processor 1 that the voltage of a main power source 5 from which power is supplied to the processor 1 controlling a programmable controller is reduced to the upper limit value of a rated voltage, data storage means 1 and 17 where data required for control of the processor 1 at the time of restoration of the main power source 5 is stored at the time of report from the first report means 9, a second report means 11 which stores data in data storage means 1 and 17 and reports it to the processor 1 that the voltage of the main power source 5 reaches the lower limit value of the rated voltage, and a power switching means 7 which switches the power source for power supply to the processor 1 from the main power source 5 to an auxiliary power source 7 by the report from the second report means 11 are provided.</p> |
