9 PLC Setup
9-18
CJ2 CPU Unit Software User’s Manual
z Power OFF Interrupt Disabled
This parameter determines whether the power OFF interrupt task is enabled.
Note This parameter is not supported when the CJ1W-PD022 Power Supply Unit is mounted.
z Power OFF Interrupt Task
This parameter determines whether a power OFF interrupt task will be executed when a power inter-
ruption is detected. (When this parameter is set to ON, the regular program will just stop when a
power interruption is detected.)
The power OFF interrupt task will be stopped when the power hold time (processing time after
power interrupt + power OFF detection delay time) has elapsed. The maximum power hold time is
10 ms.
When a power OFF detection delay time has to be set, be sure that the power OFF interrupt task
can be executed in the available time (10 ms minus the power OFF detection delay time).
Note This parameter is not supported when the CJ1W-PD022 Power Supply Unit is mounted. (Refer to A-5 Oper-
ation for Power Interruptions.)
z Enable High-speed Interrupt Function (CJ2H CPU Units Only)
This parameter is used to enable or disable high-speed interrupt function.
High-speed interrupt function improve execution of interrupt tasks under certain restrictions. For
details, refer to 10-2-6 High-speed Interrupt Function.
If the Use Synchronous Operation Check Box is selected in the PLC Setup, the Enable high-speed
interrupt function Check Box will be selected automatically.
z Synchronous Unit Operation Settings (CJ2H CPU Units Only)
These settings are required to use the synchronous unit operation function. Refer to 10-8-7 PLC
Setup for details.
Parameter Settings Default Function
Related
flags and
words
Power Off Inter-
rupt disabled
ON: Disabled
OFF: Enabled
ON When this setting is set to OFF (enabled), the
power OFF interrupt task will be executed
when power is interrupted.
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Parameter Settings Default Function
Related
flags and
words
Enable high-
speed interrupt
function
OFF: Disable high-
speed interrupt func-
tion.
ON: Enable high-speed
interrupt function.
OFF (Disable high-
speed interrupts.)
High-speed interrupt function
is enabled when the Enable
high-speed interrupt function
Option is selected.
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