OPC UA Pub/Sub UDP communication has been integrated into TwinCAT 3 software runtime. This extension of the OPC UA specification introduces the publisher/subscriber principle into the established and standardized OPC UA communication protocol. Conventional client/server applications are decoupled from one another in publisher/subscriber-based data communication and no longer need to "know" each other. The publisher simply sends its data, as a UDP multicast in this case, to a multicast group. The subscribers receive the data by subscribing to the multicast group instead of the actual device.
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