This OPC UA MachineModuleHistoricalRecordType ObjectType contains the specifications of the machine module that have been valid in the past. When the machine module manufacturer modifies the machine in a way that impact the OPC UA server specification, the machine module manufacturer will save an object of type MachineModuleHistoricalType to the organising folder PastSpecificationRecords which is a component of the relevant MachineModule.

Figure 13 shows an overview for the MachineModuleHistoricalRecordType with related Objects. It is formally defined in Table 25.

Figure 13 – MachineModuleHistoricalRecordType overview

The MachineModuleHistoricalRecordType is formally defined in Table 25.

Table 25 – MachineModuleHistoricalRecordType Definition

Attribute	Value
BrowseName	MachineModuleSpecificationTypevi
IsAbstract	False
References	Node Class	BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of BaseObjectType defined in OPC 10000-5.
HasComponent	Object	MachineModuleSpecification		MachineModuleSpecifcationType	Mandatory
HasProperty	Variable	ValidUntil	DateTime	PropertyType	Mandatory

The MachineModuleHistoricalRecordType ObjectType is a concrete type and can be used directly.

The Object MachineModuleSpecification contains a specification that was valid in the past.

The Property ValidUntil contains the date of the last day the MachineModuleSpecification was valid. The Property ValidUntil shall be set by the OEM when changes that impact the machine module specification are made.