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7.5 VariableTypes ToC Previous Next

7.5.4 ISA95TestResultType ToC Previous Next index

The ISA95TestResultdType is a concrete VariableType that can be used directly. It is a subtype of BaseDataVariableType defined in OPC 10000-5.

This VariableType indicates the test results. Value attribute of this DataVariable is structured data. However, each element of the structure can be accessed via Properties.

Table 44 – ISA95TestResultType definition

Attribute Value
BrowseName ISA95TestResultType
IsAbstract False
ValueRank 0 (OneOrMoreDimensions)
DataType Structure
Historizing True

Subtype of the BaseDataVariableType defined in OPC 10000-5

References NodeClass BrowseName DataType TypeDefinition ModellingRule
HasISA95Attribute Variable Id NodeId PropertyType Mandatory
HasISA95Attribute Variable ResultDescription LocalizedText PropertyType Mandatory
HasISA95Attribute Variable TestDate DateTime PropertyType Mandatory
HasISA95Attribute Variable Result BaseDataType PropertyType Mandatory
HasISA95Attribute Variable ResultUnitOfMeasure BaseDataType PropertyType Mandatory
HasISA95Attribute Variable Expiration DateTime PropertyType Mandatory

Note: TheVariable has aDataType ofStructure which is generic and must be assigned to a defined sub-type before it is transmitted on the wire. The generic Structure DataType results in anExtensionObject being placed on the wire. The default defined sub-type is either ISA95TestResultDataType or ISA95TestResultMeasurementDataType depending on the nature of the data. If a different structure is used, it shall include all of the fields defined in this structure and the defined sub-type of this variable type shall also include any additional fields that are in the structure as separate variables.

Id is an identifier of the Test Result. This field can be used to reference the actual result.

ResultDescription is an additional information or description of the test result.

TestDate is the date and time of the test. This Time is used to determine when a test expires, it is server specific as to whether it is a test start time or end time, but it should be consistent in all cases.

Result is the result of the test (further defined in subtypes).

ResultUnitOfMeasure is the unit of measure of the associated test result. It is defined as a structure to allow either a EUInformation or a measurement code (clause 6.3.8) to be reported.

Expiration is the date of the expiration of the test result.

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