Omron CJ - 08-2008 - Page 389

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Explanations of PLC Setup Settings Section 7-2
Note The power OFF detection delay time setting cannot be changed while the
CPU Unit is in RUN mode or MONITOR mode. This setting is not supported
when the CJ1W-PD022 Power Supply Unit is mounted. (Refer to
Power OFF
Operation on page 451
.)
Note The execution time for the power OFF interrupt task must be less than the
maximum time available, namely: 10 ms – power OFF detection delay time.
Refer to
10-3 Power OFF Operation for details on CPU Unit operation when
power is turned OFF.
Special I/O Unit Cyclic
Refreshing
When a Special I/O Unit will be refreshed in an interrupt task by IORF(097) or
FIORF(225) (CJ1-H-R CPU Units only) or data will be read from or written to a
Special I/O Unit in an interrupt task using IORD (222) or IOWR (223), always
disable cyclic refreshing for that Unit with this setting.
If cyclic refreshing is not disabled and either of the following processes is exe-
cuted in an interrupt task, a non-fatal error will occur and the Interrupt Task
Error Flag (A40213) will turn ON.
• I/O refreshing is executed using IORF(097) or FIORF(225) (CJ1-H-R
CPU Units only) for the same Special I/O Unit.
• Data is read or written to or from the memory area using IORD (222) or
IOWR(223) for the same Special I/O Unit.
Note Whenever disabling a Special I/O Unit's cyclic refreshing, be sure that the I/O
for that Unit is refreshed with IORF(097) or FIORF(225) (CJ1-H-R CPU Units
only) in the program at least every 11 seconds during operation. A CPU Unit
service monitoring error will occur in the Special I/O Unit if it is not refreshed
every 11 seconds.
100 V
85 V
Power Interrupt Detection Time
AC power supply: 10 to 25 ms
(not consistent)
Power interrupt
detection time
Power OFF
detection
delay time
0 to 10 ms
Regular program
Time
Power OFF
interrupt task
Stop
Special I/O Unit
CPU Unit
Special
I/O Unit
Area
These settings determine whether or not
data will be exchanged with the 10 words
allocated to each Special I/O Unit in the
Special I/O Unit Area during cyclic I/O
refreshing.