Mitsubishi Electric Melsec Q Series User Manual page 155

6
FUNCTIONS
(2) When an error occurs in job execution
(a) The job execution is canceled when the error cause is the following:
(b) If a job execution is canceled, the operation processed before the error
Remark
(c) When [Notify errors (job cancellation) that occur during job execution] has been
• Failure in device data writing due to network disconnection within the
programmable controller system
• Failure in device data writing, or an operation error
• Failure in access to database (except for jobs for which DB buffering is
enabled)
Section 6.1.10 DB buffering function
• When statistic processing of [Moving average], [Moving maximum] or [Moving
minimum] is specified for a tag component, sampling for the specified number
of times is not complete.
• Failure in program execution
occurrence returns to the status before the job execution.
The following explains access to device data in the programmable controller CPU
and to the database.
(1) Device data in the programmable controller CPU
Since all of data are written to the device data area in the programmable
controller CPU at a time upon completion of job execution, any change due to
the error is not reflected in the device data of the programmable controller
CPU.
(2) Database
Rollback is executed assuming the time immediately before job activation as
a commit point.
However, when the database is Wonderware
executed. When an error occurs, data input before error occurrence is
reflected on the database.
selected, a value is assigned to the specified tag component.
Section 7.10.5 Setting items for job cancellation
®
Historian, rollback is not
6.1 DB Interface Function
6.1.11 Precautions
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