What are the two mechanisms for data exchange in OPC UA?

Two mechanisms described for data exchange are: –

The first mechanism is a client-server model where UA clients are used in the dedicated services of the UA server. The second mechanism is a publisher-subscriber model where a UA server is making a configurable subset for information to be available to any number of listeners.

The mechanisms defined above are detached from the actual protocol. TCP and HTTPS are available for the client-server. UDP, as well as AMQP and MQTT, are available for the subscriber model. As defined above, both variants are required:

The context for peer-to-peer is for secure, confirmed transport with restriction in several connections. 

The distribution for broadcast is under the aspect of “fire and forget”.

OPC UA can be combined both with AMQP or MQTT. But a device that is resource-constrained with MQTT only should be able to handle its data in OPC UA via MQTT as per the information model format.

Source:- Elektronik Praxis

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.