Omron CP1L-EL20DR-D, Operation Manual

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Power OFF Operation Section 2-6
The following timing chart shows the CPU Unit power OFF operation in more
detail.
Power OFF Timing Chart
Description of Operation
Power OFF will be detected if the DC power supply falls below 85% of the
rated voltage for the power OFF detection time (2 ms minimum for DC
power). The CPU reset signal will turn ON while the internal power supply is
being held and the CPU Unit will be reset.
2-6-2 Instruction Execution for Power Interruptions
If power is interrupted and the interruption is detected when the CPU Unit is
operating in RUN or MONITOR mode, the instruction currently being executed
will be completed and then the CPU Unit will be reset.
Power OFF detection time:
The time from when the power supply voltages drops to 85% for DC power until the
power OFF condition is detected.
Holding time for 5 V internal power supply after power OFF detection:
The maximum time that the 5 V internal power supply voltage will be maintained after
the power OFF condition is detected. The holding time is fixed at 1 ms.
DC: 85% of rated voltage
Operation always stopped
at this point regardless.
Power OFF detected signal
Program execution status
CPU reset signal
Cyclic tasks or interrupt tasks Stopped
Power OFF detected
Power OFF Detection
Delay Time
DC: 2 ms
Holding time for 5 V internal
power supply after power
OFF detection: 1 ms