Edit an engineering unit

If you make changes to an engineering unit, the changes are applied to all tags in the system that are currently using that engineering unit.

Note: Engineering units are case-sensitive. That means AVEVA Historian differentiates between ml (milliliters) and ML (megaliters), for example.

To edit an engineering unit

1. In the Operations Control Management Console, expand a server group and then expand a server.

2. Expand Configuration Editor, expand System Configuration, and then expand Tag Configuration.

3. Select Engineering Units.

4. In the details pane, double-click the engineering unit to edit. The Properties dialog box displays.

   

5. In the Tag Rate box, enter the default rate, in milliseconds, at which tags are cyclically stored, based on engineering units. Although the system does not make use of this engineering unit based tag rate, you can reference this value in custom SQL scripts. The value you enter for this tag rate does not affect the default storage rate set for the tag.

6. Select a Canonical Unit for the engineering unit. This list contains all visible units from the Engineering Units Catalog corresponding with the selected dimension. See Configure the engineering units catalog for more information.

7. Click OK.