Omron CJ2 CPU - REV 10-2010 User Manual page 115

Example: If the power OFF detection delay time is set to 4 ms in PLC Setup, then execution time
must be less than 10 minus 4 ms, or 6 ms.
Power OFF interrupt task
Note A power OFF condition is recognized when the power supply falls below 85% of the minimum rated voltage
(80% for DC power supplies), and the time it takes before the power OFF interrupt task actually executes is
the default power OFF detection time (10 to 25 ms for AC power supplies and 2 to 5 ms for DC power sup-
plies) plus the power OFF detection delay time in the PLC Setup (0 to 10 ms). Cyclic tasks will be executed
for this amount of time.
Power supply < 85% of the
minimum rated voltage (80%
for DC power supplies)
Restrictions on Using the Power OFF Interrupt Task
Execution Not Possible during Online Editing
The power OFF interrupt task will not be executed if power is interrupted during online editing.
Instructions That Cannot Be Used in the Power OFF Interrupt Task
Some instructions cannot be used in the power OFF interrupt task, in addition to the instructions that
cannot be used in any interrupt tasks. For details, refer to 5-2-4 Designing Tasks.
CJ2 CPU Unit Software User's Manual
Less than 10 ms minus the
power OFF detection delay time
The default setting is 10 ms max.
END
Power OFF
recognized
Cyclic task Power OFF interrupt task
10 ms minus the power
Default power OFF
OFF detection delay time
detection time plus
power OFF detection
delay time
5 Understanding Programming
CPU reset
(force end)
Stop
5
5-23