Omron CJ1G-CPU series, Programming Manual

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Startup Settings and Maintenance Section 6-6
This function can be used with sets of instructions that must be executed as a
group, e.g., so that execution does not start with intermediate stored data the
next time power is turned ON.
Procedure
1,2,3... 1. Set the Disable Setting for Power OFF Interrupts in A530 to A5A5 Hex to
enable disabling Power OFF Interrupts.
2. Enable disabling Power OFF Interrupts in the PLC Setup (this is the default
setting).
3. Use DI(693) to disable interrupts before the program section to be protect-
ed and then use EI(694) to enable interrupts after the section. All instruc-
tions between DI(693) and EI(694) will be completed before the Power
OFF Interrupt is executed even if the power interruption occurs while exe-
cuting the instructions between DI(693) and EI(694).
Related Settings
6-6-6 Clock Functions
The CS/CJ-series PLCs have the following clock functions:
• Monitoring of the time that power interruptions occurred
• Monitoring of the time that the PLC was turned on
• Monitoring of the total time that the PLC has been on
Name Address Meaning
Disable Setting
for Power OFF
Interrupts A530 Enables using DI(693) to disable power OFF inter-
rupt processing (except for execution of the Power
OFF Interrupt Task) until EI(694) is executed.
A5A5 Hex: Enables using DI(693) to disable power
OFF interrupt processing
Any other value: Disables using DI(693) to disable
power OFF interrupt processing
DI
EI
D
I
E
I
▼
Execution condition
Power interrupted.
Instructions executed.
Power supply drops
below 85% of rated
value (80% for DC
power supplies).
CPU Unit reset
(forced end)
Interrupts enabled, causing
CPU Unit to be reset.
Interrupts disabled.
Power interruption
detected.
Instructions executed
through EI(694).
Stop
10 ms - Power
OFF detection
delay (Power OFF
confirmation time)
Power OFF
detection time
+ Power OFF
detection
delay