RetrievalMode Property (HistoryQueryResult)

• Visual Basic
• C#
• C++/CLI

'Declaration
 
Public Property RetrievalMode As String

'Usage
 
Dim instance As HistoryQueryResult
Dim value As String
 
instance.RetrievalMode = value
 
value = instance.RetrievalMode

public string RetrievalMode {get; set;}

public:
property String^ RetrievalMode {
   String^ get();
   void set (    String^ value);
}

Property Value

Valid values are: CYCLIC, DELTA, FULL, INTERPOLATED, BESTFIT, AVERAGE, MINIMUM, MAXIMUM, INTEGRAL, SLOPE, COUNTER, VALUESTATE, and ROUNDTRIP. FULL = All stored values are returned; CYCLIC = All stored data for tags during the specified time interval are returned for the number of retrieval cycles or resolution specified; DELTA = Only values that changed during the specified time interval are returned. For all other modes, a calculation is performed by the system on the data and the value(s) are returned.

The default is CYCLIC for retrieval from analog tables, DELTA for retrieval from discrete and string tables, and default is DELTA for retrieval from the History table, unless the specific retrieval mode implies otherwise. For example, SLOPE always has DELTA characteristics.