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6.18 Error History
6.18.1 Basic model QCPU
6
FUNCTIONS
6.18 Error History
The CPU module can store the error history (results detected from the self-diagnosis
function and the time) in the memory.
The error history can be checked by choosing [Diagnostics] [PLC diagnostics] on GX
Developer.
POINT
The detection time uses the CPU module internal clock, so make sure to set the
correct time when using the CPU module for the first time.
( Section 6.5)
6.18.1 Basic model QCPU
(1) Storage area
The 16 latest errors are stored into the latched error history storage memory of the
Basic model QCPU.
(2) Stored data
If the same error occurs two or more times while the PLC power is ON, the data is
stored only once into the error history storage memory.
(3) Error history clearing method
To clear the error history storage memory, choose [Diagnostics] [PLC diagnostics]
on GX Developer and click the button.
Clearing the error history clears all data in the error history storage memory of the
Basic model QCPU.
Clear log
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