IEC 62541-14:2026 defines the PubSub communication model. It defines an OPC UA publish
subscribe pattern which complements the client server pattern defined by the Services in
IEC 62541-4. See IEC 62541-1 for an overview of the two models and their distinct uses.
PubSub allows the distribution of data and events from an OPC UA information source to
interested observers inside a device network as well as in IT and analytics cloud systems.
This document consists of
• a general introduction of the PubSub concepts,
• a definition of the PubSub configuration parameters,
• mapping of PubSub concepts and configuration parameters to messages and transport
protocols,
• and a PubSub configuration model.

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