12 Troubleshooting
12-24
NJ-series CPU Unit Software User’s Manual (W501)
* For details, refer to I/O Operation for Major Fault Level Controller Errors on page 12-7.
Event name I/O Refreshing Timeout Error Event code 6003 0000 hex
Meaning Consecutive I/O refresh failures occurred during the primary periodic task or periodic task period.
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 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.
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.
There are too many Units and slaves
that perform I/O refresh in the task
period.
Move the I/O refresh processes to
other tasks, for example move I/O
refresh processes within the task to
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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