Omron CP1H CPU UNITS - PROGRAMMING 05-2007, Operation Manual

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Power OFF Operation
Section 2-6
2. A momentary power interruption that lasts more than 10 ms for AC power
or more than 2 ms for DC power may or may not be detected.
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 100 to 240 V AC power supply falls below
85% of the rated voltage or the DC power supply falls below 90% of the rated
voltage for the power OFF detection time (10 ms minimum for AC power and
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.
10 ms
0
85% of the rated voltage or less for AC power
90% of the rated voltage or less or DC power
0 to 10 ms for AC
0 to 2 ms for DC
Greater than 10 ms for AC
Greater than 2 ms for DC
Operation will continue or stop
depending on whether or not a
momentary power interruption is
detected.
Power supply
voltage
Power supply
voltage
Time
Momentary power
interruption not detected
and operation continues.
Power OFF detection time:
The time from when the power supply voltages drops to 85% or less of the rated
voltage for AC power or 90% 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.
AC: 85% of rated voltage
DC: 90% 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
AC: 10 ms
DC: 2 ms
Holding time for 5 V internal
power supply after power
OFF detection: 1 ms