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Historian SDK

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HistorianQualityRule Enumeration

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Represents the supported quality rules for retrieval. The results are timestamped according to the setting of the TimeStampRule system parameter in the historian.

Syntax

'Declaration
 
Public Enum HistorianQualityRule 
   Inherits System.Enum
'Usage
 
Dim instance As HistorianQualityRule
public enum HistorianQualityRule : System.Enum 
public enum class HistorianQualityRule : public System.Enum

Members

MemberDescription
ExtendedA quality rule of EXTENDED means that data values with both good and uncertain OPC quality are used in the retrieval calculations.
GoodA quality rule of GOOD means that data values with uncertain (64) OPC quality are not used in the retrieval calculations and are ignored.
NoneThe setting of the QualityRule system parameter for the historian is used to determine the quality criteria for retrieval calculations.
OptimisticA quality rule of OPTIMISTIC means that calculations that include some good and some NULL values do not cause the overall calculations to return NULL.

Remarks

The quality rule specifies whether values with certain characteristics are explicitly excluded from consideration by retrieval.

Inheritance Hierarchy

System.Object
   System.ValueType
      System.Enum
         ArchestrA.HistorianQualityRule

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also

Reference

ArchestrA Namespace

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