8-2SectionPower Interruptions
112
3. The system will stop unconditionally if the power interruption lasts more than
25 ms.
85% of the rated voltage or less
Power supply
voltage
AC: 0 to 10 ms
DC: 0 to 5 ms
Power interruption not
detected; operation
continues.
Operation will continue or
stop depending on whether
or not the power interrup-
tion is detected.
Power interruption detected and opera-
tion stops.
Time
Power supply
voltage
AC: 10 to 25 ms
DC: 5 to 25 ms
25 ms and longer
Power supply
voltage
25 ms0 ms
AC: 10 ms
DC: 5 ms
Note The above description assumes that the power interrupt detection delay set in
the CPU Unit is 0 ms.
A detailed timing chart for Customizable Counter Unit power interruption is pro-
vided below.
Power Interruption Timing Chart
85% of rated
voltage
Power OFF
detected signal
Customizable
Counter Unit
status
CPU reset signal
Operation always stopped
at this point regardless.
Internal 5-V power after interrupt
detection
Power hold time: Fixed at 10 ms
Power OFF detected
Power OFF detected
Processing time after
power interrupt detection
(10 ms – power interrup-
tion detection delay)
Default power inter-
ruption detection
time: 10 to 25 ms
(not stable)
Power interruption
detection delay: 0 to
10 ms (set in PC
Setup in CPU Unit)
Normal operation
Internal standby processing
Stopped
Note 1. Depending on the slot to which the Customizable Counter Unit is mounted, it
may not be possible to complete power interruption processing correctly
(e.g., saving counter values, ending instruction execution, etc.).
2. When the Customizable Counter Unit is restarted from the CPU Unit, power
interruption processing is not performed and saving counter values and
ending instruction execution will not be possible. Whenever possible, stop
the Customizable Counter Unit using the RUN/STOP Command Bit before
resetting it from the CPU Unit. (Even in this case, counter values will not be
held correctly.
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