Configuration of retrieval methods

Client applications request attribute values for a specific time or time range. For example, a client application might display an optional time range context (a time range symbol, such as a trend, must be present on the display to enable reception of a time range). You typically configure the data reference to expect either a time or a time range. The attribute value then consists of the following information:

• The value of the point at a specific time. See Configure value retrieval by time.

• The result of a calculation on the point's values over a time range. See Configure value retrieval by time range. For example, the attribute value could be the average of the point values over an hour.

Videos

For information on how to retrieve aggregate values in PI point data references, watch this video:

For information on how to retrieve a single value in a PI point data reference, offset by a time period, watch this video: