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 |
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|
IsAbstract |
False |
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|
ValueRank |
0 (OneOrMoreDimensions) |
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|
DataType |
Structure |
|||||
|
Historizing |
True |
|||||
|
References |
NodeClass |
BrowseName |
DataType |
TypeDefinition |
ModellingRule |
|
|
Subtype of the BaseDataVariableType defined in OPC 10000-5 |
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|
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: The Variable has a DataType of Structure 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 an ExtensionObject 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.