Tag properties

A tag has the following properties:

• Name: Tag name used in AVEVA Production Accounting DR, which does not necessarily need to correspond to a tag name in a system external to AVEVA Production Accounting. However, if it is drawing data from an external historian tag, voluntarily enforcing some degree of correspondence makes good sense.

• Type: Tag measurement type, F: Flow rate, T: Temperature, P: Pressure, L: Laboratory, I: Inventory Volume. AVEVA Production Accounting uses this measurement type to request the right type of averaged or snapshot data from the external system.

• Att: Tag measurement attribute.

  Attribute	Name	Description
  A	Archived Tag (Default)	Archived tags are used for reading data that are archived, such as normal process tags. The event value generated is a time weighted average value from all archived data points retrieved for the given time period.
  C	Calculated Tag	Calculated tags are used for reading calculation expression. The event value generated is the calculated value based on a calculation expression that contains tags.
  S	Sampled Tag	Sampled tags are used for readings that are compressed, such as laboratory tags. The event value generated is a time weighted average value from the number of data points retrieved for the given time period. If there is no sample data, it gets the latest sample value.
  T	Totalizer Tag	Totalizer tags are used for reading that is totalized, such as electricity tags or flow quantity indicators. The event value generated is the end time’s measured value minus the start time’s measured value.
  D	Daily Totalizer Tag	Daily totalized tags are used for reading that is daily totalized. The event value generated is the maximum value between the (start time plus 60 minutes) and (end time plus 60 minutes) measured value. This attribute is supported with all PI interfaces and OPC HDA. Note: In the AVEVA Production Accounting version 2022 R2, the Daily Totalizer Tag supports user defined Daily Totalizer Interval (hh:mm format). For more information, refer to Daily Totalizer Interval.
  O	Old Daily Totalizer Tag	Old daily totalized tags are used for reading that is archived for the yesterday’s totalized value. The event value generated is the measured value at the 10/6 minutes after end time.
  M	Manual Input Tag	Manual Input tags are used for user input tags.
  Y	Yesterday Tag	Manual input tag with the start date time stamp of the accounting period. For example, if the accounting period for Jan. 1st day is Jan. 1st 00:00:00 ~ Jan. 2nd 00:00:00 and they manually input the end inventory value of 1st day with 1st 00:00:00 time stamp, AVEVA™ Production Accounting get the end inventory value of 1st day with 2nd 00:00:00 time stamp and it is not matched. In case of flow tag, if they manually input the flow value of 1st day with 1st 00:00:00 time stamp, you can choose "Y" tag attribute as same as the above inventory tag.

• Interval: The sampling interval desired for the data retrieved. The time interval is specified in minutes and default value is zero, which means it uses the same time interval as the event period of the object. For example, the interval for flow tags is normally allowed to default zero, which permits the summarizing functionality in the historian to use the actual sampled values that came from the field devices.

• Process Name: Process unit name where this tag exists. This field is not mandatory and is defined only for informational purposes.

• Interface Name: Interface name defined in the Edit Interface Information dialog box.

• Tag Name: Tag name in process historian such as PI or InfoPlus or relational database such as Oracle or MS SQL Server.

• Description: Description of the tag. This is not mandatory

• Eng. Unit: Engineering unit of the tag, which will be the engineering unit in the RTDB.

• Rate Unit: Rate unit such as per day, per hour, per min (minute). Flow rate type measurement shall be defined this rate unit.

• Default value: Average or default measurement value of the tag. This can be used when the tag’s measurement point has no value in the interface. Zero is the default value.