OPC UA PubSub (Publish/Subscribe) extends OPC UA beyond client/server communication, enabling flexible and scalable data distribution in industrial networks.
How PubSub Works
Instead of point-to-point client/server connections, publishers send messages to a message-oriented middleware (e.g. MQTT or UDP multicast) and subscribers receive only what they need. This decouples producers and consumers of data.
Key Advantages
- Scalable one-to-many and many-to-many data distribution
- Lower network load through selective subscription
- Cloud and edge friendly (MQTT transport)
- Same OPC UA security and information modeling
PubSub is the natural choice for modern architectures that combine real-time plant data with IT systems and cloud platforms.
