Failure History - Mitsubishi Electric MELSEC-Q Series User Manual

7 FUNCTION

7.13 Failure History

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The Basic model QCPU can store the failure history (results detected from the self-
diagnosis function and the time) in the memory.
POINT
The detection time uses the Basic model QCPU internal clock, so make sure to set
the correct time when first using Basic model QCPU.
(1) Storage Area
The latest 16 failures are stored in the latched Basic model QCPU failure history
storage memory.
(2) Stored data
If the same error occurs more than once during PLC power-on, it is stored into
the failure history storage memory only once.
(3) Failure History Clearing Method
The failure history storage memory are cleared using the failure history clear in
the GX Developer PLC diagnosis mode.
Data files stored in Basic model QCPU failure history storage memory can be
cleared with a failure history clear.
MELSEC-Q
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