Omron SYSMAC CS Series Operation Manual page 532

Power OFF Operation
85% of rated
voltage
Power OFF
detected signal
Program execution
status
CPU reset signal
494
With the above procedure, all instructions between DI(693) and EI(694) (or
END) will be completed (see note 1) before the Power OFF Interrupt is exe-
cuted even if the power interruption occurs while executing the instructions
between DI(693) and EI(694).
Note 1. The protected instructions can be completed only when the time required
to complete execution is less than or equal to the processing time after
power interruption detection (10 ms − power interruption detection delay
time). If the instructions is not completed within this time, they will be inter-
rupted and the above processing will be performed.
2. If the Power OFF Interrupt Task is not disabled in the PLC Setup, the Power
OFF Interrupt Task will be executed, and the CPU Unit will be reset without
executing the protected instructions as soon as the power interruption is
detected.
3. If a power interrupt is detected while DI(693) is being executed, the CPU
Unit will be reset without executing the protected instructions.
Power OFF detected
Power OFF
detection time:
Default is 10 to 25 ms
(Power OFF undeter-
mined)
Cyclic tasks or interrupt tasks
not associated with power OFF
Interrupt processing is performed according to the contents of A530 and the
PLC Setup as shown below.
A530
Power OFF
Interrupt Task
(PLC Setup)
Holding time for 5 V internal
power supply after power
OFF detection: 10 ms.
Power OFF confirmed
Power OFF Detection
Delay Time: 0 to
10 ms (set in PLC Set-
up)
DI(693)
Instructions between
DI(693) and EI(694)
are executed.
A5A5 hex (disabling
power interrupt
processing)
Disabled All instructions between
DI(693) and EI(694) are
executed and the CPU Unit
is reset.
Enabled Execution of the current instruction is completed, the
Power OFF Interrupt Task is executed, and the CPU Unit
is reset.
Section 10-3
Operation always stopped
at this point regardless.
Processing time after
power OFF is confirmed:
10 ms minus Power OFF
Detection Delay Time
Note: The interrupt task
execution time must be
less than or equal to pro-
cessing time after power
OFF is confirmed.
EI(694)
Stopped
Other
Execution of the current
instruction is completed
and the CPU Unit is reset.