Omron SYSMAC CS1D-PD Series Operation Manual page 395

Power OFF Operation
The following illustration is for a CS1D CPU Unit with A530 set
to A5A5 hex to enable prohibiting power interrupt processing.
85% of rated
voltage
Power OFF
detected signal
Program execution
status
CPU reset signal
Duplex CPU Systems
Single CPU Systems
must be set to maintain the setting of the IOM Hold Bit at Startup, or
the following type of instruction must be included at the beginning of
the program to set A530 to A5A5 hex.
A20011
First Cycle Flag
Note If the power interruption becomes finalized during execution of DI(693), the
instructions through EI(694) or END(001) will not be executed and the CPU
Unit will be reset.
Holding time for 5 V internal power
supply after power OFF detection:
10 ms.
Power OFF detected Power OFF confirmed
Power OFF Detection
Default power OFF
Delay Time: 0 to 10 ms
detection time: 10 to
(set in PLC Setup)
25 ms
Cyclic tasks
If A530 is not set to A5A5 hex, i.e., if prohibiting power interruption processing
is not enabled, only the current instruction will be executed and then power
interruption processing will be performed.
Power interruption processing is performed according to the contents of
A530.
A530 = A5A5 hex
(disabling power interrupt processing)
All instructions between DI(693) and
EI(694) are executed and the CPU Unit is
reset.
A530
Power OFF Disabled
Interrupt Task
(PLC Setup)
Enabled
Set A530 to A5A5 Hex at the
beginning of the program to enable
MOV
#A5A5 disabling power interruption
A530
processing.
Operation always stopped
at this point regardless.
D E
Stopped
I I
Instructions between
DI(693) and EI(694)
are executed.
A530 = Any value except A5A5 hex
Execution of the current instruction is
completed and the CPU Unit is reset.
A5A5 hex (disabling
power interrupt
processing)
All instructions between
DI(693) and EI(694) are
executed and the CPU Unit
is reset.
Execution of the current instruction is completed, the
Power OFF Interrupt Task is executed, and the CPU Unit
is reset.
Section 9-3
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 proc-
essing time after power
OFF is confirmed.
Other
Execution of the current
instruction is completed
and the CPU Unit is reset.
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