Omron NSJ CONTROLLERS - 03-2008 Operation Manual page 150

Power OFF Operation
Power supply
voltage
Power supply
voltage
Power supply
voltage
Power OFF Timing Chart
Power OFF
detection voltage
Power OFF
detected signal
Program execution
status
CPU reset signal
The power holding time for the NSJ Controller itself is too short (2 ms) and the
Power OFF Detection Delay Time in the PLC Setup will not work for it.
Power OFF
detection
voltage
10 ms
A. Operation
continues
Momentary power
interruption not
Operation will continue
detected and op-
or stop depending on
eration continues.
whether or not a
momentary power
interruption is detected.
The following timing chart shows the power OFF operation in more detail.
Power OFF detected
Power OFF
detection time:
NSJ Controller: 2 ms
AC: 10 to 25 ms
PD025: 2 to 5 ms
PD022: 2 to 10 ms
Cyclic tasks or interrupt tasks not
associated with power OFF
Power OFF Detection Time
The time it takes to detect power OFF after the power supply falls below the
power OFF detection voltage.
Power OFF Detection Delay Time
The delay time after power OFF is detected until it is confirmed. With the NSJ
Controller, the power OFF detection delay time is always 0 ms.
25 ms
B. Operation
Unknown
stops
area
Momentary power interruption
detected and operation stops.
Operation always stopped
at this point regardless.
Holding time for 5 V
internal power supply
after power OFF detection
Power OFF confirmed
Power OFF
Detection Delay
Time: Always 0 ms
Power OFF
interrupt
task
Section 7-1
Time
Processing time after power
OFF is confirmed: 2 ms
(PD022: 1 ms)
Note: The interrupt task
execution time must be less
than or equal to the
processing time after power
OFF is confirmed.
Stopped
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