I have a concern in using SQC alarms because if I am manually entering in lab quality data, there will be instances in which I need to update or delete data that has been entered. This data is stored in a PI point that is the source point for the SQC, I believe that the SQC will not reflect these changes.
Say I have an SQC point that will go out of control if a value is above a threshold of 7. Someone enters a value of 4 and afrter enetring in more data, later on notices that this value should have been 8. A change is made to the archive. I observe that the SQC point does not reflect this change and will not show an alarm.
Is there a way to fix this?
For older (relative to newer more efficient PI Notifications) PI Alarm points, there is no automatic way of recalculating alarms covering potential changes in the source tags. One has to write their own logic, e.g. using PI ACE, to reapply the logic to the alarm tags.