Testing TSN in Brownfield: How to Pilot Without a Full Rip-and-Replace

Time-Sensitive Networking (TSN) promises deterministic Ethernet for industrial control — but deploying it in existing plants can feel risky. Most production environments can’t afford extended downtime or rewiring. Fortunately, a TSN pilot can be run in a brownfield environment with minimal disruption, proving value before full rollout.

Why Pilot First

TSN is more than a faster Ethernet — it’s a set of IEEE standards (802.1AS, 802.1Qbv, 802.1Qbu) that add precise synchronization and traffic shaping. Testing ensures compatibility with existing switches, PLCs, and motion systems before large-scale adoption.

Designing a Minimal TSN Pilot

A successful pilot validates timing, interoperability, and diagnostics. Key design steps:

• Choose a representative cell: Select one production area with diverse device types (sensors, PLCs, drives).
• Use TSN-capable switches: Confirm IEEE 802.1AS and 802.1Qbv support.
• Integrate gateways: Connect non-TSN devices via legacy bridges to maintain process continuity.
• Capture performance baselines: Measure jitter, cycle time, and packet loss before and after TSN.

Test Metrics to Capture

Best Practices

• Use managed switches with TSN-aware monitoring tools.
• Run the pilot in parallel to live control to compare real-world latency.
• Log data using OPC UA PubSub diagnostics for auditability.
• Keep pilot duration 4–6 weeks to capture full production variability.

Case Example: Food Packaging Line

A food packaging OEM installed a TSN test ring beside its existing PROFINET network. Synchronization achieved 90 ns deviation across 8 nodes, proving TSN compatibility with existing controllers. The success justified a phased migration plan for 40 lines.

Scaling from Pilot to Production

After pilot validation, integrate TSN islands gradually — replacing one cell at a time and reusing certified switches. Ensure firmware uniformity across vendors, as non-synchronized clocks can degrade performance even if compliant on paper.

Related Articles

• From Fieldbus to Ethernet: Migration Paths That Don’t Break Production
• OPC UA over TSN Explained: Determinism Without Vendor Lock-In
• Vendor Interoperability Check: What to Ask Before You Buy

Conclusion

Testing TSN in brownfield plants doesn’t require a full overhaul. A targeted pilot validates timing, security, and interoperability while maintaining uptime. This approach builds confidence for full-scale convergence between IT and OT networks.