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MELSEC-Q
15 TROUBLESHOOTING
15.1 Error and warning details
[1] Errors
Types of errors
Errors detected by the QD75 include parameter setting range errors and errors at
the operation start or during operation.
(1) Parameter setting range errors
The parameters are checked when the power is turned ON and at the rising
edge (OFF
ON) of the PLC READY signal [Y0]. An error will occur if there is
a mistake in the parameter setting details at that time.
When this kind of error occurs, the QD75 READY signal does not turn ON.
To cancel this kind of error, set the correct value in the parameter for which
the error occurred, and then turn ON the PLC READY signal [Y0].
(2) Errors at the operation start or during operation
These are errors that occur at the operation start or during operation when the
positioning control, JOG operation, or inching operation is used. If an axis
error occurs during interpolation operation, the error No. will be stored in both
the reference axis and the interpolation axis.
Note that, in the following cases (a) and (b), the axis error No. will be stored
only in the reference axis during analysis of the positioning data set in each
point of the positioning start data table.
(a) When the interpolation axis is BUSY.
(b) When the error occurred in positioning data or parameters unrelated to
interpolation control.
If the error occurred at the simultaneous start of a positioning operation, the
axis error storage details will differ depending on whether the error occurred
before or after the simultaneous start.
•
If the error occurred before the simultaneous start (illegal axis No., other axis
BUSY, etc.), an "error before simultaneous start" will occur.
•
If the error occurred after the simultaneous start (positioning data error,
software stroke limit error, etc.), an error code corresponding to the axis in
which the error occurred will be stored. Because a simultaneous start
cannot be carried out due to this, a "simultaneous start not possible error"
error code will be stored in all axes in which an error has not occurred.
The axis operation status will be displayed as "error occurring" for axes in
which an error occurred.
If an error occurs during operation, any moving axes will deceleration stop,
and their operation status will be displayed as "error occurring".
All axes will decelerate to a stop during interpolation operations, even if the
error occurs in only one axis.
(3) Types of error codes
Error code Error type
001 to 009 Fatal error
100 to 199 Common error
200 to 299 Error at OPR or absolute position restoration
300 to 399
Error during JOG operation or during inching
operation
500 to 599 Error during positioning operation
800 to 899 I/F (Interface) error
900 to 999 Error during parameter setting range check