The CalibrationPrognosisType provides information about the GMS status regarding its performance. During the calibration the GMS’s errors are determined. The GMS performance is verified if the error is not greater than the specification. The information about the error is not used for correction. The GMS is not considered as a calibration target according to OPC 10000-200. Therefore a separate specification is defined here. The CalibrationPrognosisType is formally defined in Table 28.

Table 28 – CalibrationPrognosisType Definition

Attribute	Value
BrowseName	CalibrationPrognosisType
IsAbstract	False
References	Node Class	BrowseName	DataType	TypeDefinition	Other
Subtype of the PrognosisType defined in OPC UA for Machine Tools i.e. inheriting the InstanceDeclarations of that Node.
0:HasProperty	Variable	Calibrated	0:Boolean	0:PropertyType	0:Mandatory
0:HasProperty	Variable	CalibrationInterval	0:Duration	0:PropertyType	0:Optional
0:HasProperty	Variable	CalibrationPreptime	0:Duration	0:PropertyType	0:Optional
0:HasProperty	Variable	DateOfCalibration	0:UtcTime	0:PropertyType	0:Mandatory
0:HasProperty	Variable	CalibrationCertificate	0:String[]	0:PropertyType	0:Optional
Conformance Units
GMS CalibrationPrognosisType

Calibrated indicates whether the machine is calibrated or not.

CalibrationInterval is defined as the interval of time in which the machine needs a new calibration. The exact interval depends on the measuring principle and the machine utilization and is provided by the customer.

CalibrationPreptime is defined as the additional time needed to prepare a calibration considering the calibration interval to assure that the calibration expired (see Figure 24 for reference).

Figure 24 – Explanation for the difference between the calibration interval and the calibration preparation time.

DateOfCalibration is defined as the date and time when the last calibration was carried out.

CalibrationCertificate contains a reference to all available calibration certificates.