OPC UA architecture: address space, subscriptions and security
OPC UA’s node-based address space, subscription model and security layers from an integration point of view: NodeId, sampling and certificate decisions.
Read the articleKey takeaways
- An OPC UA server publishes data as nodes in an address space; the meaning of a value comes with the node’s attributes and references.
- Using subscriptions instead of constantly polling values is one of the main design decisions that determine network and server load.
- Security mode, security policy and certificate trust are configured separately; the “None” mode is not recommended for production networks.