12 Troubleshooting
12-26
NJ-series CPU Unit Software User’s Manual (W501)
Event name Task Period Exceeded Event code 60010000 hex
Meaning Task execution was not completed during the set task period for the primary periodic task or a periodic task.
Source PLC Function Module Source details None Detection
timing
Continuously
Error attributes Level Minor fault Recovery Error reset Log category System
Effects User program Continues. Operation If the task execution does not finish within the set task
period, the I/O refresh operation will be as follows:
• CJ-series Units: No I/O refresh is executed.
When task execution is completed, I/O refreshing for the
next period is executed.
• EtherCAT slaves: The same values are output as for the
previous output refresh.
If the task execution does not finish within the set task
period, overall control of the equipment may become
impossible.
System-defined
variables
Variable Data type Name
_<Task_name>_Exceeded BOOL Task Period Exceeded Flag
_<Task_name>_ExceedCount UDINT Task Period Exceeded Count
_<Task_name>_LastExecTime TIME Last Task Execution Time
_<Task_name>_MaxExecTime TIME Maximum Task Execution Time
Cause and
correction
Assumed cause Correction Prevention
The task period setting is too short. Check the task execution time and
change the task period to an appro-
priate value.
Design the tasks considering the cor-
rections that are given on the left.
A user program is too large. Separate the processes into different
tasks, for example move processes
that need a short execution period to
a periodic task with a lower priority.
The number of times that processing
is repeated is larger than expected.
If there is a program with an
extremely high number of repetitions,
correct the program to achieve the
correct number of repetitions. Set a
trap in the user program that monitors
the number of times a process is exe-
cuted to check the number of repeti-
tions.
Task Priority Error for Periodic Tasks
and Event Tasks
Increase the priorities of the periodic
tasks. Or, decrease the priorities of
the event tasks so that they are lower
than the priorities of the periodic
tasks.
Frequent Event Task Execution Lower the frequency of event task
execution. Or, decrease the priorities
of the event tasks.
Attached
information
Attached Information 1: Name of task where error occurred
Precautions/
Remarks
You can change the level of the error to an observation in the task settings.
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