Power Off Detection Delay Setting - Omron CJ2 CPU - REV 10-2010 User Manual

10 CPU Unit Functions

10-3-2 Power OFF Detection Delay Setting

By default, an AC power interruption of 10 ms or longer (2 ms for a DC power interruption) will be
detected about 10 to 25 ms (2 to 5 ms for DC power supplies) after the power supply voltage drops
below 85% of the minimum rated value (80% for DC power supplies). There is a setting in the PLC
Setup that can extend this time. When the power OFF interrupt task is enabled, it will be executed when
the power interruption is confirmed, otherwise the CPU Unit will be reset and operation will be stopped.
PLC Setup
When using the CX-Programmer, make the setting in the Power Off detection time Field on the Tim-
ings/Synchronous Tab Page.
Additional Information
If you will not use the power OFF interrupt task, set the power OFF detection time to 10 ms or
less as a measure for power interruptions. If the CJ1W-PD022 Power Supply Unit is used, how-
ever, a delay cannot be set, so use the default setting of 0 ms.
10-24 CJ2 CPU Unit Software User's Manual