| 摘要 |
<p>In order to achieve a PLC that is as compact as possible for saving device data at a time of a power source failure, a CPU unit (2) is provided with a tantalum capacitor (22) for accumulating power on the basis of a power source supplied by a power source unit (3) and supplying the accumulated power to a power source circuit (10) if the power source from the power source unit (3) is disrupted, wherein if the supply of the power mains to the power source unit (3) is stopped, a processor (11) saves device data (124) stored in high-speed RAM (123) to backup-use RAM (13) using power accumulated in the tantalum capacitor (22).</p> |
