Use annotations in AVEVA Historian Client Trend

You can use Trend to make an annotation for a tag at any point in time. An annotation is a user comment about a tag. For example, you might want to save a comment about a very high spike in a trend. You can create an annotation for the value of the tag at the spike. All annotations are saved to the database and can be retrieved again at a later time.

You can create a private annotation (that only you can see) or a public annotation (which is viewable by all trend users). Private annotations are only available to the users who created them and have suitable access.

For each annotation, an annotation mark (solid circle) is added to the trend. This annotation mark can be viewed on the trend if the trend properties are set to allow it.

When you make an annotation, the following information is stored in the Annotation table in the Runtime database of the Historian:

• Name of the tag for which the annotation is associated.

• The date/time of the annotation. The time of the annotation is based on the position of where it was created on the time axis.

• The value of the tag at the time of the annotation.

• The annotation text.

  Note: You cannot use the Annotations functionality when connected to a Managed Historian.