(1) If the momentary power failure time allowed momentary power failure time periods if momentary power failure occurs, the module error records and suspend the operation process. However, the timer continues timing device. And the output status will be retained. If the specified SFC routine starts again, save the data system. After a momentary power failure recovery power module will resume operation process. Even if a power failure occurs instantaneously suspended operation process, watchdog timer (WDT) continues timing.(2) If the momentary power failure longer than the allowable momentary power failure time period CPU module will perform an initial start. Handling and below the same operation. - PLC power - reset operation - Remote programming tool reset operation in a redundant power supply module, power supply module if any momentary power failure occurs, the operation will not be suspended. However, if in the case where a power supply module only momentary power failure occurs, the operation will be suspended.