CJ2 CPU Unit Software User's Manual - CIP ETI

3 CPU Unit Operation3-1-3 Processing at Power InterruptionsIf power is interrupted and the interruption is confirmed while the CPU Unit is operating, the instructioncurrently being executed will be completed and the following power interruption processing will be performed.Processing at power interruption will be performed according to the settings for power OFF interruptiontasks. *1• If the power OFF interrupt task has been enabled, the task will be executed and then the CPU Unitwill be reset immediately.• If the power OFF interrupt task has not been enabled, the CPU Unit will be reset *2 immediately.*1 The power OFF interrupt task is executed immediately before the CPU Unit is reset due to power interruption.*2 It is possible to perform power interruption processing after a specified range of instructions is executed whenthe power is interrupted during operation.Operation will always continue for momentary power failures of less than 10 ms for an AC power supplyand less than 2 ms for a DC power supply. It is possible to lengthen the time from which a power interruptionis detected until it is confirmed as a power interruption when the power supply conditions arepoor.For information on processing at power interruption, refer to A-5 Operation for Power Interruptions.33-1 CPU Unit Internal Operation3-1-3 Processing at Power InterruptionsCJ2 CPU Unit Software User’s Manual3-7