OPC UA Pub/Sub over TSN (Time-Sensitive Networking, IEEE 802.1) brings deterministic real-time behaviour to standard Ethernet networks, replacing proprietary protocols such as EtherCAT or PROFINET IRT and supporting the IT/OT convergence promised by Industrie 4.0.

TSN is a set of IEEE 802.1 standards that turn ordinary Ethernet into a deterministic real-time network. Combined with OPC UA Pub/Sub at the application layer, the result is rich semantic data over a deterministic transport, on commodity Ethernet hardware. The strategic goal is to replace proprietary industrial Ethernet variants such as EtherCAT or PROFINET RT with the standard TSN + OPC UA stack. Adoption is progressing through the 2024-2028 window, and major drive vendors (Siemens, B&R), robot vendors and motion-control vendors are migrating their portfolios.

When specifying a new motion-control cell in 2026, request a roadmap from your drive vendor on OPC UA Pub/Sub over TSN even if you deploy EtherCAT today: TSN is the migration path, and the choice of switch silicon today will determine your options in 3-5 years.