OPC UA Server References

If you want to use a predefined OPC UA node in your commissioning file, you can use a Node reference to achieve that. One use case of that is placing newly defined nodes at the certain point in the OPC UA server tree. The other possibility is to publish data of predefined nodes as MQTT capable nodes.

It is possible to create an instance of an object type by using the resource type Cybus::Node::OpcuaObject

Custom ReferenceNode Properties

Custom ObjectNode Properties

Example Commissioning File

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opcua-references-example.yml

---
description: Test for placing a ToolType inside a MachineTool instance

metadata:
    name: Tooltype placement test

resources:
    opcuaServer:
        type: Cybus::Server::Opcua
        properties:
            hostname: 192.168.178.46
            securityModes: ['None', 'SignAndEncrypt']
            securityPolicies: ['None', 'Basic256Sha256']
            nodesetFiles: ['di', 'machinery', 'machineTool']
            allowAnonymous: true
            port: 4841

    ######################################
    #
    # referencing the "Machines" folder
    # which got provided by the Machinery
    # nodeset file
    #
    ######################################
    machineRoot:
        type: Cybus::Node::OpcuaReference
        properties:
            parent: !ref opcuaServer
            referenceNodeId: 'i=1001'
            namespaceUrl: 'http://opcfoundation.org/UA/Machinery/'

    ######################################
    #
    # instantiating a MachineToolType
    # from the MachineTool type
    #
    ######################################
    testMachineToolType:
        type: Cybus::Node::OpcuaObject
        properties:
            parent: !ref machineRoot
            browseName: MyMachineToolTypeTest
            objectTypeName: MachineToolType
            sourceNamespaceUrl: 'http://opcfoundation.org/UA/MachineTool/'

    ######################################
    #
    # referencing the "Equipment" subfolder
    # of the instantiated toolType
    #
    ######################################
    EquipmentFolder:
        type: Cybus::Node::OpcuaReference
        properties:
            parent: !ref testMachineToolType
            relativeBrowsePath: '/4:Equipment'

    ######################################
    #
    # add a toolList type
    # of the instantiated toolType
    #
    ######################################
    toolList:
        type: Cybus::Node::OpcuaObject
        properties:
            parent: !ref EquipmentFolder
            browseName: Tools
            objectTypeName: ToolListType
            sourceNamespaceUrl: 'http://opcfoundation.org/UA/MachineTool/'

    #########################################
    #
    # instantiating a ToolType and placing it
    # into the tools list folder of the instance
    #
    ########################################
    demoToolInstance:
        type: Cybus::Node::OpcuaObject
        properties:
            parent: !ref toolList
            browseName: DemoTool
            objectTypeName: ToolType
            sourceNamespaceUrl: 'http://opcfoundation.org/UA/MachineTool/'

Preexisting nodeIds can be referenced using an absolute nodeId, e.g ns=1;s=1001. It is also possible to reference a nodeId by a browsePath from a certain start point that needs to be specified as well.

For more information on BNF, see the OPC Foundation Reference.