EnableDeltaRetrieval

The EnableDeltaRetrieval property is a read-write property that enables or disables delta retrieval for the trend control.

Syntax

aaHistClientTrend.EnableDeltaRetrieval = discrete;

Result = aaHistClientTrend.EnableDeltaRetrieval;

Remarks

The aaHistClientTrend control only takes this property into account when retrieving data from the AVEVA Historians with a version earlier than 9.0. For more information, see Retrieval Styles, Application Settings, and Tag Settings.

Delta retrieval is used for analog and discrete queries that have a time range that are within the settings of the MaxMinutesForDeltaAnalog and MaxMinutesForDeltaDiscrete properties.

Delta retrieval is always used for the "live" retrieval mode. If you set this property to False, this has no effect on live mode.

The default value is False.