Edit general information for an analog tag

To edit general information for an analog tag

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 Analog Tags.

4. In the details pane, double-click the analog tag you want to edit. The Properties dialog displays.

   

5. Select the General tab.

6. In the Description box, type a description of the tag.

7. From the Engineering Unit list, select the unit of measure. Examples are mph, grams, and pounds.

   For information on adding an engineering unit to the system, see Configure engineering units.

   Note: If the tag is initially configured using AVEVA Application Server, changes made to the engineering unit are not preserved. Instead, you must change the engineering unit at the source, and then redeploy the engine.

8. In the Min Value box, type the minimum value of the tag, measured in engineering units.

9. In the Max Value box, type the maximum value of the tag, measured in engineering units.

   In the Current Editor group, specify which application or editing environment controls the tag definition. Tags imported from the InTouch HMI software use InTouch as the current editor. If modifications are made to an imported tag in the Historian Configuration Editor, then the current editor for the tag is changed to AVEVA Historian. If a reimport is performed, any modifications made using the Configuration Editor are preserved. You can manually maintain InTouch as the current editor for reimporting; however, all changes made to the tag using the Configuration Editor are lost during the reimport. Tags (attributes) that are initially configured using AVEVA Application Server use the ArchestrA Integrated Development Environment (IDE) as the current editor. If you modify an Application Server tag using the Historian Configuration Editor, then the current editor for the tag is changed to AVEVA Historian. However, the next time you redeploy the engine, the changes are not preserved.

10. In the Interpolation Type group, type the analog value to use as the last point of the retrieval cycle.

    For more information, see Interpolated retrieval in the AVEVA Historian Retrieval Guide.

    • Linear
      The system will calculate a new value at the given cycle time using linear interpolation.

    • Stair Step
      The last known point is returned with the given cycle time.

    • System Default
      The settings of both the InterpolationTypeReal and InterpolationTypeInteger system parameters are used.

      In the Rollover Value box, type the rollover value if this tag is a counter-type tag. (A typical example is for a flowmeter measuring flow or an integer counter, such as those used on a packing line.) The rollover value is the first value that causes the counter to "roll over." This rollover value is used by the "counter" retrieval mode. For example, a counter that counts from 0 to 9999, the counter rolls over back to 0 for the 10,000th value it receives. Therefore, set the rollover value to 10,000.

11. For more information, see Counter retrieval in the AVEVA Historian Retrieval Guide.

12. Click OK.