Omron SYSMAC CV Series Operation Manual page 471

PC Operation
Momentary Power Interruptions
Power interruption
85%
Power
supply
Power
interruption
signal
Program
execution
Momentary Power
Interruption Flag
(A40202)
CPU reset
signal
RUN output
460
The following diagram and explanation show the CPU operation when the power
goes off momentarily.
Power interruption detection
time: 10 to 25 ms for AC power,
0.3 to 1 ms for DC power
Duration of
interruption
Momentary power
Shutdown
interruption time
processing
Normal Standby
Stops
The initial CPU operation during a momentary power interruption is identical to
the first two items under the power OFF procedure heading above. In a momen-
tary power interruption, power returns to 85% of full power before the power in-
terruption time is exceeded.
When the CPU detects a power supply voltage above 85% of full power, the
power interruption signal will be turned OFF and program execution will contin-
ue from the point at which it was interrupted. The momentary power interruption
time (the time from the system shutdown procedure to the point that the power
interruption signal was turned OFF) is recorded in milliseconds (0000 ms to
9999 ms) in A007. The day and time that the most recent power interruption oc-
curred are recorded in A012 and A013, and the total number of interruptions is
recorded in BCD in A014.
Auxiliary Area words A012 and A013 contain the time at which power was inter-
rupted, as shown in the following table.
Word Bits
A012 00 to 07 Seconds
08 to 15 Minutes
A013 00 to 07 Hours
08 to 15 Day of month 01 to 31 (adjusted by month and for leap year)
The default for the momentary power interruption time in the PC Setup is 0 ms.
Set the momentary power interruption time to 9 ms or less. Even if the momen-
tary power interruption time exceeds the power hold time (10 ms), only those
power interruptions shorter than 10 ms will be considered as momentary power
interruptions.
To determine the actual length of a power interruption, add the time recorded in
A007 to the time required to detect a power interruption (10 ms to 25 ms) and the
time required to execute the system shut down procedure (1 ms).
Power restored
(recorded in A007)
(default: 0 ms)
Normal
Recovery
Contents
00 to 59
00 to 59
00 to 23 (24-hour system)
Section 6-1
OFF
ON
Possible values