9.1.5 Connection model

9.1.5.1 Overview

Figure 47 depicts the ObjectType for the PubSub connection model and its components and the relations to other parts of the model.

9.1.5.2 PubSubConnectionType

This ObjectType is a concrete type for Objects representing PubSubConnections. A PubSubConnection is a combination of protocol selection, protocol settings and addressing information. The PubSubConnectionType is formally defined in Table 266.

The PublisherId is defined in 6.2.7.1.

The TransportProfileUri is defined in 6.2.7.2. The Property is initialized with the default transport protocol for the Address during the creation of the connection. The SelectionValues Property of the SelectionListType shall contain the list of supported TransportProfileUris. The SelectionListType is defined in OPC 10000-5.

The ConnectionProperties is defined in 6.2.7.4.

The Address is defined in 6.2.7.3. The abstract NetworkAddressType is defined in 9.1.5.3. The default type used for concrete instances is the NetworkAddressUrlType defined in 9.1.5.7. It represents the Address in the form of a URL String.

The transport protocol mapping specific settings are provided in the optional Object TransportSettings. The ConnectionTransportType is defined in 9.1.5.8. The Object shall be present if the transport protocol mapping defines specific parameters.

The configured WriterGroup and ReaderGroup Objects are added as components to the instance of the PubSubConnectionType. PubSubGroup Objects may be configured with product-specific configuration tools or added and removed through the OPC UA Methods AddWriterGroup, AddReaderGroup and RemoveGroup.

The Status Object provides the current operational status of the connection. The PubSubStatusType is defined in 9.1.10. The state machine for the status and the relation to other PubSub Objects like PublishSubscribe, PubSubGroup, DataSetWriter and DataSetReader are defined in 6.2.1.

The Diagnostics Object provides the current diagnostic information for a PubSubConnectionType Object. The PubSubDiagnosticsConnectionType is defined in 9.1.11.8.

9.1.5.3 AddWriterGroup Method (Deprecated)

This deprecated Method is used to add a new WriterGroup Object to an instance of the PubSubConnection.

The Client should be authorized to modify the configuration for the PubSub functionality when invoking this Method on the Server.

Signature

	AddWriterGroup (
		[in]	WriterGroupDataType 	Configuration,
		[out]	NodeId			GroupId
		);
	

Method Result Codes

Table 267 specifies the AddressSpace representation for the AddWriterGroup Method.

9.1.5.4 AddReaderGroup Method (Deprecated)

This deprecated Method is used to add a new ReaderGroup Object to an instance of the PubSubConnection.

The Client should be authorized to modify the configuration for the PubSub functionality when invoking this Method on the Server.

Signature

	AddReaderGroup (
		[in]	ReaderGroupDataType 	Configuration,
		[out]	NodeId			GroupId
		);
	

Method Result Codes

Table 268 specifies the AddressSpace representation for the AddReaderGroup Method.

9.1.5.5 RemoveGroup Method (Deprecated)

This deprecated Method is used to remove a PubSubGroup Object from the connection.

A successful removal of the PubSubGroup Object removes all associated DataSetWriter or DataSetReader Objects. Before the Objects are removed, their state is set to Disabled.

The Client should be authorized to modify the configuration for the PubSub functionality when invoking this Method on the Server.

Signature

	RemoveGroup (
		[in]	NodeId	GroupId
		);
	

Method Result Codes

Table 269 specifies the AddressSpace representation for the RemoveGroup Method.

9.1.5.6 NetworkAddressType

An instance of a subtype of this abstract ObjectType represents network address information. The NetworkAddressType is formally defined in Table 270.

The NetworkInterface Variable allows the selection of the network interface used for the communication relation. The network interface can be listed by name, by IP address or a combination of name and IP address. The SelectionValues Property of the SelectionListType shall contain the list of available network interfaces as application-specific strings. The Value of the Variable contains the selected network interface as String. The SelectionListType is defined in OPC 10000-5. The Object may allow providing additional Strings not defined in the SelectionValues. In this case the NotRestrictToList Property of the SelectionListType is set to true.

9.1.5.7 NetworkAddressUrlType

An instance of this ObjectType represents network address information in the form of a URL String. The NetworkAddressUrlType is formally defined in Table 271.

The URL Variable contains the address string for the communication middleware or the communication relation. The syntax of the URL is defined by the transport protocol.

9.1.5.8 ConnectionTransportType

This ObjectType is the abstract base type for Objects representing transport protocol mapping specific settings for PubSubConnections. The ConnectionTransportType is formally defined in Table 272.

9.1.5.9 HasWriterGroup

The HasWriterGroup ReferenceType is a concrete ReferenceType that can be used directly. It is a subtype of the HasComponent ReferenceType.

The SourceNode of References of this type shall be an instance of the PubSubConnectionType defined in 9.1.5.2.

The TargetNode of this ReferenceType shall be an instance of the WriterGroupType defined in 9.1.6.3.

Servers shall provide the inverse Reference that relates a WriterGroup Object back to a PubSubConnectionType Object.

The representation of the HasWriterGroup ReferenceType in the AddressSpace is specified in Table 273.

9.1.5.10 HasReaderGroup

The HasReaderGroup ReferenceType is a concrete ReferenceType that can be used directly. It is a subtype of the HasComponent ReferenceType.

The SourceNode of References of this type shall be an instance of the PubSubConnectionType defined in 9.1.5.2.

The TargetNode of this ReferenceType shall be an instance of the ReaderGroupType defined in 9.1.6.6.

Servers shall provide the inverse Reference that relates a ReaderGroup Object back to a PubSubConnectionType Object.

The representation of the HasReaderGroup ReferenceType in the AddressSpace is specified in Table 274.