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Historian SDK

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OpcQuality Property (HistoryQueryResult)

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Gets or sets the basic data quality indicator associated with the data value.

Syntax

'Declaration
 
Public Property OpcQuality As UShort
'Usage
 
Dim instance As HistoryQueryResult
Dim value As UShort
 
instance.OpcQuality = value
 
value = instance.OpcQuality
public ushort OpcQuality {get; set;}
public:
property ushort OpcQuality {
   ushort get();
   void set (    ushort value);
}

Property Value

The OPC quality value.

Remarks

Normal OPC quality retrieval logic is applied if:

  • All the points found and processed for this row have GOOD quality. If they all have the same GOOD quality, then that quality is returned.
  • If there is a gap in the entire calculation cycle, then BAD quality is returned for the tag.
  • For any other scenario with any mixture of GOOD and BAD points, a DOUBTFUL OPC quality (64) is returned.

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

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