Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual page 227

Interrupt Tasks
Programming
Console address
Word +195, bits 0 to Scheduled inter-
3 rupt time units
Power OFF Interrupt Task: Task 1
Interrupt Numbers and Scheduled Interrupt Task Number
Interrupt No.
4
5
PLC Setup Settings
Name Description
Sets time unit for scheduled inter-
rupts to execute interrupt tasks at
fixed intervals.
The power OFF interrupt task is disabled in the default PLC Setup at the start
of cyclic task execution.
The power OFF interrupt task can be enabled in the PLC Setup.
In the default PLC Setup, the power OFF interrupt task will be stopped after
10 ms. The power OFF interrupt task must be executed in less than 10 ms.
If a power OFF detection delay time is set in the PLC Setup, the power OFF
interrupt task will be stopped after 10 ms minus the power OFF detection
delay time setting in the PLC Setup. In this case, the power OFF interrupt task
must execute in less than 10 ms minus the power OFF detection delay time
set in the PLC Setup.
Example: If the power OFF detection delay time is set to 4 ms in PLC Setup,
then execution time must be less than 10 minus 4 ms, or 6 ms.
Power OFF interrupt task
Note A power OFF condition is recognized when the power supply falls below 85%
of the minimum rated voltage (80% for DC power supplies), and the time it
takes before the power OFF interrupt task actually executes is the default
power OFF detection time (10 to 25 ms for AC power supplies and 2 to 5 ms
for DC power supplies) plus the power OFF detection delay time in the PLC
Setup (0 to 10 ms). Cyclic tasks will be executed for this amount of time.
Scheduled interrupt task
2
3
Settings
00 Hex: 10 ms
01 Hex: 1.0 ms
02 Hex: 0.1 ms
(CJ1-H-R/CJ1M
CPU Units only)
Less than 10 ms minus the
power OFF detection delay time
The default setting is 10 ms max.
Section 4-3
Default setting
00 Hex
187