12-23
12 Troubleshooting
NJ-series CPU Unit Software User’s Manual (W501)
12-2 Troubleshooting
12
12-2-4 Error Descriptions
* For details, refer to I/O Operation for Major Fault Level Controller Errors on page 12-7.
Errors Related to Tasks
Event name Task Execution Timeout Event code 60020000 hex
Meaning Task execution exceeded the timeout detection time.
Source PLC Function Module Source details None Detection
timing
Continuously
Error attributes Level Major fault Recovery Cycle the power
supply or reset
the Controller.
Log category System
Effects User program Stops. Operation Stops.*
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 timeout detection time setting is
too short.
Increase the timeout detection time. Design the tasks considering the cor-
rections that are given on the left.
The task period setting is too short. Increase the task period.
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 Increase the priority of the task. Or,
decrease the priorities of the other
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
None
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