7 Calibration Target Management ToC Previous Next

7.4 OPC UA ObjectTypes ToC Previous Next

7.4.1 CalibrationTargetType ObjectType ToC Previous Next index

The CalibrationTargetType provides information about a calibration target and is formally defined in Table 46. This concrete ObjectType can directly be used to represent a calibration target, or subtyped to define specific types of calibration targets.

Table 46 – CalibrationTargetType Definition

Attribute Value        
BrowseName CalibrationTargetType        
IsAbstract False        
Description Provides information about a calibration target.        
References Node Class BrowseName DataType TypeDefinition Other
Subtype of the 0:BaseObjectType defined in OPC 10000-5, i.e. inheriting the InstanceDeclarations of that Node.          
0:HasComponent Object 2:Identification -- 2:FunctionalGroupType M
0:HasProperty Variable LastValidationDate 0:UtcTime 0:PropertyType O
0:HasProperty Variable NextValidationDate 0:UtcTime 0:PropertyType O
0:HasProperty Variable Quality 0:Byte 0:PropertyType O
0:HasProperty Variable CertificateUri 0:String 0:PropertyType O
0:HasComponent Object CalibrationTargetCategory - BaseCalibrationTargetCategoryType M
0:HasComponent Object OperationalConditions - 0:FolderType O
0:HasComponent Object CalibrationTargetFeatures - 0:FolderType M

The 2:Identification Object, using the standardized name defined in OPC 10000-100, provides identification information about the calibration target. It implements the 2:IVendorNameplateType and 2:ITagNameplateType, see Table 49. The Properties defined by those interfaces are listed in Table 24. All Properties are defined as optional. It is recommended to provide the 2:ProductInstanceUri to uniquely identify the calibration target. Other Properties, like 2:SoftwareRevision, will in most cases not be provided. If the calibration target is a device (ReusableDeviceCalibrationTargetCategoryType, see 7.4.4), they might be provided.

The optional LastValidationDate provides the date, the calibration target was validated the last time. If there is no specific validation date known, the date when the calibration target was bought or created should be used. If the CalibrationTargetCategory is of type ReusableCalibrationTargetCategoryType or a subtype, the LastValidationDate shall be provided.

The optional NextValidationDate provides the date, when the calibration target should be validated the next time. If this date is not known, the Property should be omitted.

Note: Potentially the NextValidationDate is in the past, when the next validation did not take place.

The optional Quality provides the quality of the calibration target in percentage, this is, the value shall be between 0 and 100. 100 means the highest quality, 0 the lowest. The semantic of the quality is application-specific and not further defined in this specification.

The optional CertificateUri contains the URI of a certificate of the calibration target, in case the calibration target is certified and the information available. Otherwise, the Property should be omitted. The String shall be a URI as defined by RFC 3986.

Note: In many cases, the NextValidationDate, Quality, and CertificateUri will be writable and maintained from outside the Server by updating the values.

The CalibrationTargetCategory defines what category the calibration target is of. The BaseCalibrationTargetCategoryType is defined in 7.4.2. Instances of CalibrationTargetType shall use a subtype of this abstract ObjectType, and thereby provide the category of the calibration target.

The optional OperationalConditions is a folder containing information about operational conditions of the calibration target. For example, it might provide in what ranges of humidity the calibration target can be operated. It might also provide correction information, for example, depending on the temperature the calibration values need to be corrected (in case of a length, the length might increase with high temperatures). This specification just provides this folder as grouping construct for this information. The concrete information is either vendor-specific or needs to be defined by other companion specifications. If no operational conditions are provided, this folder should be omitted.

The mandatory CalibrationTargetFeatures is a folder containing information about the features of a calibration target, that is, what can be calibrated with the calibration target.

  • It can contain one or more calibration values. A calibration value indicates the value the calibration target provides for calibration and includes its quantity and engineering unit. The VariableType representing calibration values is defined in 7.5.1.
  • It can contain one or more capacity ranges. A capacity range indicates a range (low and high value) as well as a resolution, and thus defines a number of values the calibration target provides for calibration and includes the quantity and engineering unit. The VariableType representing capacity ranges is defined in 7.5.2.
  • It can contain other mechanisms to define the features of a calibration target not defined in this specification. Although all components of CalibrationTargetFeatures are defined as optional, each instance shall have at least one feature.

The components of the CalibrationTargetType have additional subcomponents which are defined in Table 47.

Table 47 – CalibrationTargetType Additional Subcomponents

BrowsePath References Node Class BrowseName DataType TypeDefinition Others
CalibrationTargetFeatures 0:HasComponent Variable <CalibrationValue> 0:Number CalibrationValueType OP
CalibrationTargetFeatures 0:HasComponent Variable <CapacityRange> 0:Range CapacityRangeType OP
Properties of the 2:IVendorNameplateType defined in OPC 10000-100            
2:Identification 0:HasProperty Variable 2:Manufacturer 0:LocalizedText 0:PropertyType O
2:Identification 0:HasProperty Variable 2:ManufacturerUri 0:String 0:PropertyType O
2:Identification 0:HasProperty Variable 2:Model 0:LocalizedText 0:PropertyType O
2:Identification 0:HasProperty Variable 2:ProductCode 0:String 0:PropertyType O
2:Identification 0:HasProperty Variable 2:HardwareRevision 0:String 0:PropertyType O
2:Identification 0:HasProperty Variable 2:SoftwareRevision 0:String 0:PropertyType O
2:Identification 0:HasProperty Variable 2:DeviceRevision 0:String 0:PropertyType O
2:Identification 0:HasProperty Variable 2:DeviceManual 0:String 0:PropertyType O
2:Identification 0:HasProperty Variable 2:DeviceClass 0:String 0:PropertyType O
2:Identification 0:HasProperty Variable 2:SerialNumber 0:String 0:PropertyType O
2:Identification 0:HasProperty Variable 2:ProductInstanceUri 0:String 0:PropertyType O
2:Identification 0:HasProperty Variable 2:RevisionCounter 0:Int32 0:PropertyType O
Properties of the 2:ITagNameplateType defined in OPC 10000-100            
2:Identification 0:HasProperty Variable 2:AssetId 0:String 0:PropertyType O
2:Identification 0:HasProperty Variable 2:ComponentName 0:LocalizedText 0:PropertyType O

The child Nodes of the CalibrationTargetType have additional Attribute values defined in Table 48.

Table 48 – CalibrationTargetType Attribute values for child Nodes

BrowsePath Description Attribute
2:Identification Provides identification information.
LastValidationDate Provides the date, the calibration target was validated the last time. If there is no specific validation date known, the date when the calibration target was bought or created should be used.
NextValidationDate Provides the date, when the calibration target should be validated the next time. If this date is not known, the Property should be omitted. Note: Potentially the NextValidationDate is in the past, when the next validation did not take place.
Quality Provides the quality of the calibration target in percentage, this is, the value shall be between 0 and 100. 100 means the highest quality, 0 the lowest. The semantic of the quality is application-specific.
CertificateUri Contains the Uri of a certificate of the calibration target, in case the calibration target is certified and the information available. Otherwise, the Property should be omitted.
CalibrationTargetCategory Defines what category the calibration target is of.
OperationalConditions A folder containing information about operational conditions of the calibration target. For example, it might provide in what ranges of humidity the calibration target can be operated. It might also provide correction information, for example, depending on the temperature the calibration values need to be corrected (in case of a length, the length might increase with high temperatures). If no operational conditions are provided, this folder should be omitted.
CalibrationTargetFeatures A folder containing information about the features of a calibration target, that is, what can be calibrated with the calibration target.
   CalibrationTargetFeatures
   <CalibrationValue>
A calibration value indicates the value the calibration target provides for calibration and includes its quantity and engineering unit.
   CalibrationTargetFeatures
   <CapacityRange>
A capacity range indicates a range (low and high value) as well as a resolution, and thus defines a number of values the calibration target provides for calibration and includes the quantity and engineering unit.

The components of the CalibrationTargetType have additional references which are defined in Table 49.

Table 49 – CalibrationTargetType Additional References

SourceBrowsePath Reference Type Is Forward TargetBrowsePath
2:Identification 0:HasInterface True 2:IVendorNameplateType
2:Identification 0:HasInterface True 2:ITagNameplateType

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