IEC 62541-14 Ed. 2.0 en:2026

Current Revision
OPC unified architecture - Part 14: PubSub

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OPC unified architecture - Part 14: PubSub

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.

This second edition cancels and replaces the first edition published in 2020. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous edition:

  • a) Addition of a “Quantity Model” which can be referenced from EngineeringUnit Properties. The model defines quantities and assigned units. In addition it provides alternative units and the conversion to them.
  • b) Addition of rules for ValuePrecision Property:
    • can also be used for other subtypes like Duration and Decimal.
    • rules have been added when ValuePrecision has negative values.
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