Please ensure Javascript is enabled for purposes of website accessibility
Powered by Zoomin Software. For more details please contactZoomin

Historian SDK

TABLE OF CONTENTS

QualityRule Property (HistoryQueryResult)

Save PDF
Save selected topicSave selected topic and subtopicsSave all topics
Share
Share to emailCopy topic URL
Gets or sets an enumeration that specifies whether values with certain characteristics are explicitly excluded from consideration by data retrieval.

Syntax

'Declaration
 
Public Property QualityRule As String
'Usage
 
Dim instance As HistoryQueryResult
Dim value As String
 
instance.QualityRule = value
 
value = instance.QualityRule
public string QualityRule {get; set;}
public:
property String^ QualityRule {
   String^ get();
   void set (    String^ value);
}

Property Value

Valid values are GOOD, EXTENDED, or OPTIMISTIC.

Remarks

This parameter will override the setting of the QualityRule system parameter.

A quality rule of GOOD means that data values with doubtful (64) OPC quality will not be used in the retrieval calculations and will be ignored. Values with bad QualityDetail indicate gaps in the data.

A quality rule of EXTENDED means that data values with both good and doubtful OPC quality will be used in the retrieval calculations. Values with bad QualityDetail indicate gaps in the data.

A quality rule of OPTIMISTIC means that calculations that include some good and some NULL values will not cause the overall calculations to return NULL.

You can apply wwQualityRule to all retrieval modes.

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

HistoryQueryResult Class
HistoryQueryResult Members

In This Topic