15 TROUBLESHOOTING

15.1Error and warning details

[1]Errors

Types of errors

MELSEC-Q

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

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Mitsubishi Electronics QD75P, QD75D user manual Error and warning details Errors, Types of errors