Find and view stale and bad points

Use the Stale and Bad Points tool to find and view stale and bad points, so you can diagnose the condition that produced the errors.

• The Stale state indicates that the PI point has not updated within a specified time. By default, a tag is stale if the current value is over four hours in the past.

• The Bad state indicates that the current value of a PI point is a digital state from the System digital state set in the archive. These values are inserted into the current value when an error condition occurs. For example, a state of I/O Timeout is a common symptom when a PI interface determines it has lost contact with the device it is configured to read.

• Not all digital states indicate errors. For example, the Scan Off digital state marks points that are no longer used, such as points from obsolete equipment, while the PtCreated digital state indicates a new point that has not yet begun collecting data. You can exclude specific digital states when you search for stale or bad points.

• You cannot use the Stale and Bad Points tool to diagnose future PI points.

  Note: For information on monitoring and troubleshooting Data Archive, see the Data Archive Administration guide.