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Node Modelling Rule
September 21, 2022
17:02, EEST
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Sabari
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Hi,
Can anyone help me understand the difference between @Mandatory and @MandatoryPalceholder ?

Thanks

September 22, 2022
10:21, EEST
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Bjarne Boström
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Hi,

Your question might be more suited on the OPC Foundation’s forum at https://opcfoundation.org/forum/opc-ua-standard/.

The relevant specification section is https://reference.opcfoundation.org/Core/Part3/6.4.4/#6.4.4.4

ModellingRules mark InstanceDeclarations in a TypeDefinition and control how the instances of the said TypeDefinition should look like. It is a complex topic depending how technical you look at it.

In short Mandatory InstanceDeclarations are “copied” as-is to the instance, i.e. the instance shall have a node with that exact BrowseName. The MandatoryPlaceholder marks that the instance shall have at least one node “like” the placeholder or more specifically that it has at least one target node attached with the same Reference and that the target has the same HasTypeDefinition reference the placeholder had.

September 22, 2022
14:42, EEST
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Sabari
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Hi,
thanks for your reply.

I already have an instance with the same typeDefinition as my MandatoryPlaceHolder node.
But How to attach my instance to my MandatoryPlaceHolder node ?

September 23, 2022
10:16, EEST
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Bjarne Boström
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Please read the tutorials and javadocs. I assume that you are looking for UaNode.addReference.

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