5 Understanding Programming
5-22
CJ2 CPU Unit Software User’s Manual
This task is executed when the power supply is interrupted. When the power supply is interrupted, the
Power Supply Unit will continue supplying 5 V of power to the CPU Unit for 10 ms, and the power OFF
interrupt tasks will be executed during that time. (If a CJ1W-PD022 Power Supply Unit is used, the
power will be supplied for only 1 ms, and so a power OFF interrupt task cannot be used.)
z Interrupt Overhead Time for Power OFF Interrupt Task
The power OFF interrupt task is executed within 0.1 ms of the power being confirmed as being inter-
rupted.
z Settings for Executing Power OFF Interrupt Task
Enable the power OFF interrupt task on the Timings/Synchronous Tab Page in the PLC Settings
Dialog Box of the CX-Programmer.
The power OFF interrupt task is disabled in the default PLC Setup at the start of cyclic task execu-
tion. To enable the power OFF interrupt task, clear the selection of the Power Off Interrupt disabled
Option in the PLC Setup.
In the default PLC Setup, the power OFF interrupt task will be stopped after 10 ms. The power OFF
interrupt task must be executed in less than 10 ms.
If a power OFF detection delay time is set in the PLC Setup, the power OFF interrupt task will be
stopped after 10 ms minus the power OFF detection delay time setting in the PLC Setup. In this
case, the power OFF interrupt task must execute in less than 10 ms minus the power OFF detection
delay time set in the PLC Setup.
Power OFF Interrupt Task
END
END
Cyclic task
Power
OFF
CPU reset
Power OFF interrupt task 1
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