Led Display When Error Occurs; Cancel Error - Mitsubishi Electric MELSEC-Q Series User Manual

7 FUNCTION

7.12.1 LED display when error occurs

7.12.2 Cancel error

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When an error occurs, the ERR. LED located on the front of Basic model QCPU turns
on.
Refer to Section 7.19 for the details of the ERR. LED operation.
Basic model QCPU error cancel operation can be performed only for error that can
continue the Basic model QCPU operation.
(1) Cancellation of error
(a) Procedures for cancellation of error
The error cancel is performed in the following manner:
1) Resolve the cause of error.
2) Store the error code of the error to be canceled in the special register
SD50.
3) Switch special relay SM50 from OFF to ON.
4) The error is canceled.
(b) Status after cancellation of error
When the CPU is recovered from canceling the error, the special relay,
special register, and LED affected by the error are set to the state before
the error occurred.
When the same error occurs after canceling the error, it is logged again in
the failure history.
(c) Cancellation of annunciator
For the cancellation of the annunciator detected multiple times, only the first
detected "F" is canceled.
POINT
When error cancellation is performed by storing the code of the error to cancel is
stored in SD50, the lower 1 digits of the code number is ignored.
MELSEC-Q
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