tagdictionary-DataPolicy

Tag dictionaries may include data policies. A data policy provides additional metadata associated with a tag or tag group. The tagdictionary palette contains the following DataPolicy components:

  • DataPolicy

  • BooleanDataPolicy

  • EnumDataPolicy

  • NumericDataPolicy

  • StringDataPolicy

Note: Typical tagging operations do not require data policies. The data policy functionality is provided primarily for use by the Analytics engine. For that reason, tag dictionaries may include added data policies.

An Add Data Policy action has been added to TagInfo and TagGroupInfo components. Invoking this action prompts you to select a DataPolicy type to add to the selected TagInfo or TagGroupInfo component in a tag dictionary.

You can also add a data policy to TagInfo or TagGroupInfo components by dragging a DataPolicy component from the tagdictionary palette onto the desired TagInfo or TagGroupInfo component.

Note: Only a single data policy can be added to TagInfo or TagGroupInfo components. You may not add a data policy if the TagInfo component is a Marker tag, or if the TagInfo or TagGroupInfo component already has a DataPolicy child.

Properties for Data Policy

NameValueDescription
Min Intervaldrop-down with time intervals (defaults to None)
Defines the minimum allowed interval when requesting a value or trend request.

When a value or trend request is processed, if the value of the Interval in the request is less than the value of this Min Interval, the Algorithm modifies the value of the Interval in the request to be the value of this Min Interval prior to processing the request.

For example, if a trend request specifies the Interval as Five Minutes and the algorithm’s Min Interval is Fifteen Minutes the algorithm changes the request Interval from Five Minutes to Fifteen Minutes before processing the request.

The default of None allows any interval to be specified in the request.

Max Intervaldrop-down with time intervals (defaults to None)
Defines the maximum allowed Interval when requesting a trend.

When an algorithm processes a value or trend request, if the value of the request’s Interval is greater than the value of this Max Interval, the algorithm modifies the value of the request’s Interval to the value of this Max Interval prior to processing the request.

For example, if the trend request specifies an Interval of Week and the algorithm’s Max Interval is Day the algorithm changes the value of the request’s Interval from Week to Day before processing the request.

The default of None allows any Interval to be specified in the request.

Preferred Time Rangefrom and to times (both default to 12 AM EDT)
Configures when the time period starts and ends.
Preferred Rollupdrop-down list of arithmetic functions
Defines the how to roll up the data when a request does not specify the rollup function.
Preferred Aggregationdrop-down list of arithmetic functions
Defines the aggregation to use when a request does not specify the aggregation function.
Unitsdrop-down list of units of measure
Identifies which unit of measurement system to use, English or metric.

EnglishMetricNone

Precision32 bit (default), 64 bit
Selects 32 bit or 64 bit options for the history data logging. The 64 bit option allows for higher level of precision but consumes more memory.
Totalized  
Trend Requiredtrue (default) or false
When true, all points must have a trend.