The ISA-95 Physical Asset Model includes defining the class of physical devices that exist in a system as well as the actual physical devices. These definitions include manufacturing related information for classes of devices and actual vendor related information for instances of physical devices. Figure 27 illustrate this abstract model and the relationships that are modelled in the OPC UA Information model. For a description of the relationship between physical assets and equipment see section 8.2.1.

Figure 27 - Manufacturers and Vendors in Physical Asset Information

Physical Assets can be composed of other Physical Assets. Physical Asset classes describe a general classification of an asset, which may be supplied by multiple vendors, each with unique model numbers. Vendors may have additional information associated with them. Individual instance of a particular Physical Asset would have a serial number that is provided by the vendor that supplied the device.

Figure 28 illustrates Physical Asset Information Model in terms of the OPC UA Information Model. This model illustrates the base Physical Asset model. It further provides an example set of possible subtypes of PhysicalAssetClassTypes and instances of Physical Assets.

Figure 28 - Physical Asset Information Model

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

This VariableType is used to provide details regarding company information for PhysicalAssetClassTypes or for instances of PhysicalAssetType. In most instances this type will be further subtyped to provide additional information regarding the company. The ISA-95 specification does not define a structure or set of fields for company information. Some systems will provide a list of additional information, such as address, contact and other details. Other system may simply provide a link or reference to some other system that provides the detailed company information. In later sections, this specification will provide a TypicalCompanyType (see D.3) that can be used as a default if no other linked system exists. This type could also be further subtyped as needed.

Table 63 – CompanyType Type definition

Attribute		Value
BrowseName		CompanyType
IsAbstract		False
ValueRank		0 (OneOrMoreDimensions)
DataType		BaseDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in OPC 10000-5.

The GeoSpatialLocationType is a concrete VariableType that can be used directly. It is a subtype of PropertyType defined in OPC 10000-3

This VariableType is used to provide details regarding Physical Location information for PhysicalAssetClassType

Table 64 – GeoSpatialLocationType Type definition

Attribute		Value
BrowseName		GeoSpatialLocationType
IsAbstract		False
ValueRank		0 (OneOrMoreDimensions)
DataType		String
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the PropertyType defined in OPC 10000-5.

The PhysicalAssetCapabilityTestResultType is a concrete VariableType that can be used directly. It is a subtype of ISA95TestResultType defined in 7.5.4.

This VariableType indicates the results from a physical asset capability test for a specific physical asset.

Table 65 – PhysicalAssetCapabilityTestResultType definition

Attribute		Value
BrowseName		PhysicalAssetCapabilityTestResultType
IsAbstract		False
ValueRank		0 (OneOrMoreDimensions)
DataType		Structure
Historizing		True
References		NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the ISA95TestResultType defined in 7.5.4.

This variable type according to ISA-95 shall have prior and or multiple results available depending on the vendor specific model. To accommodate this requirement, vendors will be required to support historical storage of instances of PhysicalAssetCapabilityTestResultType.

The PhysicalAssetClassPropertyType is a concrete VariableType that can be used directly. It is a subtype of ISA95ClassPropertyType defined in 7.5.4.

This VariableType indicates ISA95ClassProperties for a PhysicalAssetClassType. Variables of this VariableType may be associated with tests defined by PhysicalAssetCapabilityTestSpecificationType defined in 8.3.3.1.

Table 66 – PhysicalAssetClassPropertyType definition

Attribute		Value
BrowseName		PhysicalAssetClassPropertyType
IsAbstract		False
ValueRank		0 (OneOrMoreDimensions)
DataType		BaseDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the ISA95ClasspropertyType defined in 7.5.2.
HasISA95ClassProperty	Variable		<PropertyName>		PhysicalAssetClassPropertyType	OptionalPlaceholder
TestedByPhysicalAssetTest	Object		<TestSpecification>		PhysicalAssetCapabilityTestSpecificationType	OptionalPlaceholder

<PropertyName> is a placeholder for possible additional nested instances of PhysicalAssetClassPropertyType. These properties can have any name but shall be referenced using the HasISA95ClassProperty reference and shall be of type PhysicalAssetClassPropertyType or a subtype of it

<TestSpecification> is a placeholder for any test specification that an instance of this PhysicalAssetClassPropertyType conforms to. These test specifications can have any name but shall be referenced using the TestedByPhysicalAssetTest Reference and shall be of type PhysicalAssetCapabilityTestSpecificationType or a subtype of it.

The PhysicalAssetPropertyType is a concrete VariableType that can be used directly. It is a subtype of ISA95PropertyType defined in7.5.3.

This VariableType indicates ISA95Properties of a role based equipment. Variables of this type may be related to tests defined by PhysicalAssetCapabilityTestSpecificationType defined in 8.3.3.1 and have Test results associated with them.

Table 67 – PhysicalAssetPropertyType definition

Attribute	Value
BrowseName	PhysicalAssetPropertyType
IsAbstract	False
ValueRank	0
DataType	BaseDataType
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the ISA95PropertyType defined in 7.5.3.
HasTestResult	Variable	<TestResult>	BaseDataType	PhysicalAssetCapabilityTestResultType	OptionalPlaceholder
HasISA95Property	Variable	<PropertyName>		PhysicalAssetPropertyType	OptionalPlaceholder
TestedByPhysicalAssetTest	Object	<TestSpecification>		PhysicalAssetCapabilityTestSpecificationType	OptionalPlaceholder

<TestResult> is the optional results associated with an instance of PhysicalAssetCapability-TestSpecificationType These test results can have any name but shall be referenced using the HasTestResult Reference and shall be of type PhysicalAssetCapabilityTestResultType or a subtype of it. In addition each <TestResult > shall have a ResultsForSpecification Reference to the instance of the PhysicalAssetCapabilityTestSpecificationType that is associated to the given test result record. It is recommended that the names assigned to the <TestSpecification > and the <TestResult > variable follow some naming convention, to allow operators to more easily match test results to the test specification that they are for.

<PropertyName> is a placeholder for possible additional instances of PhysicalAssetPropertyTypes. These properties can have any name but shall be referenced using the HasISA95Property reference and shall be of type PhysicalAssetPropertyType or a sub type of it

<TestSpecification> is a placeholder for any capability test specification that an instance of this PhysicalAssetPropertyType conforms to. These test specifications can have any name but shall be referenced using the TestedByPhysicalAssetTest Reference and shall be of type PhysicalAssetCapabilityTestSpecificationType or a sub type of it

The PhysicalAssetCapabilityTestSpecificationType is a concrete ObjectType that can be used directly. It is a subtype of ISA95TestSpecificationType defined in 6.7.3.

This ObjectType indicates a test for a physical asset. An instance of a PhysicalAssetCapabilityTestSpecificationType may be associated with a PhysicalAssetClassType, instances of PhysicalAssetClassPropertyType, instance of PhysicalAssetType or instances of PhysicalAssetPropertyType. This is typically used where a test is required to ensure that the Physical Asset has the necessary capability and capacity. An instance of a PhysicalAssetCapabilityTestSpecificationType may be associated with multiple instances of Physical Assets and/or multiple PhysicalAssetClassTypes.

Attribute	Value
BrowseName	PhysicalAssetCapabilityTestSpecificationType
IsAbstract	False
References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the ISA95TestSpecificationType defined in 7.6.4.

The PhysicalAssetClassType is a concrete ObjectType that can be used directly. It is a subtype of ISA95ClassType defined in 6.7.1.

This ObjectType indicates a grouping of Physical Assets with similar characteristics for a definite purpose such as manufacturing operations definition, scheduling, capability and performance. An Object of PhysicalAssetClassType may be associated with an instance of a PhysicalAssetCapabilityTestSpecificationType. It is expected that subtypes of the PhysicalAssetClassType will be created that represent a particular class of physical asset. These subtypes will have their own set of instances of PhysicalAssetClassPropertyTypes and PhysicalAssetCapabilityTestSpecificationTypes

Table 68 - PhysicalAssetClassType definition

Attribute			Value
BrowseName			PhysicalAssetClassType
IsAbstract			False
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the ISA95ClassType defined in 7.6.2.
HasISA95ClassProperty	Variable		<PropertyName>	BaseDataType	PhysicalAssetClassPropertyType	OptionalPlaceholder
HasISA95Attribute	Variable		Manufacturer		CompanyType	Optional
HasISA95Attribute	Variable		ModelNumber	String	BaseDataVariableType	Optional
TestedByPhysicalAssetTest	Object		<TestSpecification>		PhysicalAssetCapabilityTestSpecificationType	OptionalPlaceholder

<PropertyName> is a placeholder for possible additional instances of PhysicalAssetClass-PropertyType. These properties can have any name but shall be referenced using the HasISA95Property reference and shall be of type PhysicalAssetClassPropertyType or a sub type of it.

Manufacturer is the Manufacturer of this PhysicalAssetClassType. The Manufacture shall be referenced using the HasISA95Attribute reference and shall be of type CompanyType or a sub type of it.

ModelNumber is the Manufacture’s ModelNumber that could be associated with this PhysicalAssetClassType. The ModelNumber is referenced using the HasISA95Attribute reference type and shall be a string of type BaseDataVariableType or a sub type of it.

<TestSpecification> is a placeholder for any capability test specification that this PhysicalAssetClassType conforms to. These test specifications can have any name but shall be referenced using the TestedByPhysicalAssetTest Reference and shall be of type PhysicalAssetCapabilityTestSpecificationType or a sub type of it

The PhysicalAssetType ObjectType is a concrete ObjectType that can be used directly. It is a subtype of ISA95ObjectType defined in 6.7.2. Individual instance of this PhysicalAssetType would have reference to PhysicalAssetClassType that the instance of the PhysicalAssetType supports. By definition of the ISA-95 model, when a Physical Asset instance or PhysicalAssetType references a PhysicalAssetClassType, the addition of said reference results in the addition of all instance of PhysicalAssetClassPropertyType defined for the referenced PhysicalAssetClassType to be added to the Physical Asset instance (or PhysicalAssetType subtype) as instances of PhysicalAssetPropertyType. These ISA95Properties will have all the same Attributes and Properties as the corresponding PhysicalAssetClassPropertyType instance.

This ObjectType may be further subtyped. The subtypes create some additional restrictions. Any PhysicalAssetClassType references that are added to a subtype of a PhysicalAssetType cannot be removed from instance of the subtype. If the PhysicalAssetType subtype is updated than all instance of the PhysicalAssetType must also be updated. For example if an additional PhysicalAssetClassType is added to the PhysicalAssetType subtype than that PhysicalAssetClassType must be added to all instances of the PhysicalAssetType subtype. This allows for creating a single PhysicalAssetType that is used for multiple physical asset instances.

This ObjectType indicates a specific physical asset. A physical asset may be tested by the execution of an instance of a PhysicalAssetCapabilityTestSpecificationType.

A PhysicalAssetType may be made of instances of PhysicalAssetType.

Table 69 – PhysicalAssetType definition

Attribute		Value
BrowseName		PhysicalAssetType
IsAbstract		False
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the ISA95ObjectType defined in 7.6.3.
HasISA95Property	Variable		<PropertyName>	BaseDataType	PhysicalAssetPropertyType	OptionalPlaceholder
MadeUpOfPhysicalAsset	Object		<PhysicalAsset>		PhysicalAssetType	OptionalPlaceholder
DefinedByPhysicalAssetClass	Object		PhysicalAssetClass		PhysicalAssetClassType	Optional
LocatedIn	Variables		PhysicalLocation	String	GeoSpatialLocationType	Optional
HasISA95Attribute	Variables		FixedAssetId	CDTIdentifier	BaseDataVariableType	Optional
HasISA95Attribute	Variables		VendorId	BaseDataType	CompanyType	Optional
TestedByPhysicalAssetTest	Object		<TestSpecification>		PhysicalAssetCapabilityTestSpecificationType	OptionalPlaceholder
ImplementationOf	Object		Equipment		EquipmentType	Optional
HasComponent	Variable		AssetAssignment	structure	ISA95AssetAssignmentType	Optional

<PropertyName> is a placeholder for possible instances of PhysicalAssetPropertyType. These properties can have any name but shall be referenced using the HasISA95ClassProperty reference and shall be of type PhysicalAssetPropertyType or a subtype of it

<PhysicalAsset> is a placeholder for instance of PhysicalAssetType that this instance of PhysicalAssetType may be made up of. .These Objects can have any name but shall be referenced using the MadeUpOfPhysicalAsset reference and shall be to PhysicalAssetType or a subtype of it

PhysicalAssetClass defines the functionality of an instance of this PhysicalAssetType. .This Object shall be referenced using the DefinedByPhysicalAssetClass reference and shall be to PhysicalAssetClassType or a subtype of it

PhysicalLocation is the actual location associated with the instance of this PhysicalAssetType

FixedAssetId is the vendor provided identification number provided with the instance of the PhysicalAssetType. For Example it maybe the serial number associated with device.

VendorId is the vendor that provides the instance of this PhysicalAssetType. This may be the same as the manufacturer associated with the related class, but it may also be different. For example a system integrator maybe the vendor that provides the PhysicalAssetType, even though it is manufactured by another company.

<TestSpecification> is a placeholder for any capability test specification that an instance of this PhysicalAssetType conforms to. These test specifications can have any name but shall be referenced using the TestedByPhysicalAssetTest Reference and shall be of type PhysicalAssetCapabilityTestSpecificationType or a subtype of it

Equipment is the Equipment assigned to the instance of the PhysicalAssetType.

AssetAssignment – Is used to track the history of the logical Equipment to which this Physical Asset was assigned.