Add an analog tag

Be sure that you do not exceed your licensed tag count by adding another tag.

To add 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. Right-click Analog Tags, and then click New Tag. The New Analog Tag wizard displays.

   

4. Enter a unique name for the analog tag. For information on allowable tag names, see Tag naming conventions.

5. Click Next. The General information dialog of the wizard displays.

   

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

7. In 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.

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 Next. The Acquisition information dialog of the wizard displays.

    

13. In the Acquisition Type list, select the method by which the tag's value is acquired. If the tag value is acquired from an I/O Server, specify the name of the I/O Server, topic, and item.

14. In the I/O Server list, select the application name of the I/O Server. This name is usually the same as the executable file name. The list includes all I/O Servers defined in the system.

15. In the Topic Name list, select the name of the topic. The list includes all topics defined for the selected I/O Server.

16. In the Item Name box, type the address string of the tag.

17. If you are editing a discrete or string tag, click OK. Otherwise, continue with the next step.

18. In the Raw Type group, select the numeric type that matches the raw value as it is acquired.

    • Integer
      Integer value. If you select this option, a list appears in which you can select the integer size, in bits, and whether it is signed or unsigned.

    • Float
      IEEE single-precision floating (decimal) point value, which supports approximately 7 decimal places. All floating point calculations are performed with 64-bit resolution, but the result is stored as a 32-bit number. Note that IDAS/SuiteLink can only send single-precision values.

    • Double
      IEEE double-precision floating (decimal) point value, which supports approximately 13 decimal places. The data is stored with 64-bit resolution. Note that if the source can only send single-precision values, storing as a double with a higher resolution consumes space with no added benefit.

      Note: For Float and Double types, some values may vary slightly from those shown in the source. See About floating-point values for more information.

19. In the Scaling group, select the type of algorithm used to scale raw values to engineering units. For linear scaling, the result is calculated using linear interpolation between the end points. The following options are required for linear scaling.

    • Min Raw
      The minimum value of the raw acquired value.

    • Max Raw
      The maximum value of the raw acquired value.

20. Click Next. The Storage information dialog of the wizard displays.

    

21. In the Storage Method area, select the way in which values for the tag will be stored.

    • Rate
      The rate at which the tag is stored if the storage type is cyclic.

22. In the Deadband area, configure details for how the tag value is stored. The availability of options in this group depends on which storage method you selected.

    • Time and Value
      A time deadband is the minimum time, in milliseconds, between stored values for a single tag. Any value changes that occur within the time deadband are not stored. The time deadband applies to delta storage only. A time deadband of 0 indicates that the system will store the value of the tag each time it changes. In the Time box, type the time to use for this deadband.

      A value deadband is the percentage of the difference between the minimum and maximum engineering units for the tag. Any data values that change less than the specified deadband are not stored. The value deadband applies to delta storage only. A value of 0 indicates that a value deadband will not be applied. In the Value box, type the value to use for this deadband.

    • Swinging Door
      A swinging door deadband is the percentage of deviation in the full-scale value range for an analog tag. The swinging door (rate) deadband applies to delta storage only. Time and/or value deadbands can be used in addition to the swinging door deadband. Any value greater than 0 can be used for the deadband. A value of 0 indicates that a swinging door deadband will not be applied. In the Rate box, type the rate to use for this deadband.

23. When you are done defining the new analog tag, click Finish.