6 Troubleshooting
6-12
CJ2 CPU Unit Hardware User’s Manual
z Cycle Time Exceeded Error
A cycle time exceeded error will occur if the PLC cycle time exceeds the setting for Watch Cycle
Time in the PLC Setup.
z Error Causes and Remedies
* The maximum processing time for an interrupt task will not be stored in A440 if High-speed interrupt function is
enabled in the PLC Setup.
Cycle Time Exceeded Error (Fatal Error)
POWER RUN ERR/ALM Error flag Error code
Error infor-
mation
Lit. Not lit. Lit. A401.08 809F None
Suspected cause of
error
Confirmation method Remedy
Prevention of recur-
rence
An interrupt task with a
long processing time was
executed.
Check the Max. Interrupt
Task Processing Time
(A440)
*
Divide the interrupt task
into sections.
Same as at the left.
An incorrect value (an
extremely large number)
was set for the number of
repeats of FOR(512).
Set up a trap in the ladder
program to monitor the
number of repeats.
Correct the ladder pro-
gram.
Same as at the left.
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