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3. After the power interruption signal is output, the CPU waits for the momen-
tary power interruption time set in the PC Setup (default: 0 ms) before pro-
ceeding. Set the power interruption time to 9–T ms max. (T is the time re-
quired to execute the power OFF interrupt program if there is one), because
the power maintenance time is 10 ms and 1 ms is required for the system
shutdown procedure.
4. The CPU determines that a power interruption has occurred if power hasn’t
returned by the end of the power interruption time. If a power OFF interrupt
program has been prepared, it will be executed as soon as the instruction
interrupted by the power interruption signal has been completed. The power
OFF interrupt program will be stopped if it is still running 10 ms after the pow-
er interrupt signal was received (10 ms is the power hold time).
Be sure that the total time required for the system shutdown procedure
(1 ms), momentary power interruption time (set in the PC Setup), inter-
rupted instruction completion time (depends on the interruption point), and
the power OFF interrupt program (depends on program length) does not ex-
ceed 10 ms.
5. A CPU reset signal will be generated and the CPU will be stopped 10 ms
after the power interruption signal is output. At this point, all outputs will turn
OFF.
The following list shows CPU procedures when power is returned to the PC.
1, 2, 3...
1. When the CPU detects a power supply voltage above 85% of full power,
both the power interruption signal and the CPU reset signal will be turned
OFF.
2. The CPU will begin initialization when the CPU reset signal is turned OFF.
3. When CPU initialization is completed, the program will be executed. If the
PC is set for restart continuation and a power ON interrupt program has
been prepared, the power ON interrupt program will be executed first, then
the main program.
Power ON Procedure
PC Operation Section 6-1
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