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AVEVA™ Historian

Example: add a catalog unit

  • Last UpdatedFeb 27, 2025
  • 2 minute read

This example demonstrates adding millimeters as a catalog unit.

To add a catalog 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. Right-click Engineering Units Catalog, and then click New Engineering Unit Catalog.... The New Catalog Unit dialog displays.

  4. Enter the following values:

    • Name: millimeters

    • Symbol (Formal and Basic): mm

    • Dimension: Length

    • System: SI

    • Reference Unit: meters (m) - SI

      Adding a new catalog unit

  5. A meter is equal to 1000 millimeters. To define this, select From as the convert option, and enter 1000 for the Factor.

    Adding a catalog unit in a properties dialog

    You can also define the conversion in the opposite direction. In this case, a millimeter is equal to 0.001 meters. To define this, select To as the convert option, and enter 0.001 for the Factor.

  6. You can now use the Test fields to verify the conversion factor and offset are set correctly by changing the value of the m or mm fields, and seeing how the other is affected. For example, entering 5 in the m field calculates the number of mm as 5000.

    Adding a catalog unit in a properties dialog

  7. When you are satisfied the conversion values are correct, select OK to save the unit.

    Note: Before the new catalog unit can be used for unit conversion, a corresponding engineering unit must be added and mapped to the catalog unit. See Configure engineering units for more information.

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