# PI PROFINET over TSN

Protocols · `PROFINET over TSN` · verification: source checked

PROFINET over TSN is an extension of PROFINET that uses Time-Sensitive Networking as an additional Layer 2 technology on Ethernet networks. It is intended for real-time industrial communication, with TSN providing bandwidth reservation, time synchronization, low latency and redundancy. The PROFINET specification V2.4 integrates TSN, and the industrial TSN profile is being developed under IEC/IEEE 60802.

## Specification

| Property | Value |
|---|---|
| Transports | ethernet_l2 |
| Architecture | master slave |
| Encoding | binary |

## Connected

- Related: [OPC UA](https://machineschema.com/protocol/opc-ua.md)

## Study notes

- PROFINET over TSN uses TSN as an additional Layer 2 technology in the PROFINET architecture.
- PROFINET specification V2.4 integrates TSN functionality.
- The TSN profile for Industrial Automation is being developed under IEC/IEEE 60802.
- TSN extends Ethernet with Quality of Service, bandwidth reservation, time synchronization, low latency and bumpless redundancy.
- Configuration of communication paths moves from engineering to device or controller runtime; users define working clock master, data rate, domain name and update cycle scheduling.
- TSN requires TSN-capable hardware; current Ethernet components cannot usually be extended to TSN by software.
- RT and IRT mechanisms remain part of the PROFINET specification.
- PROFINET with TSN addresses IRT clock-synchronous motion control applications and RT application areas.
- PROFINET services include cyclic and acyclic data, alarms/diagnostics, and parameterization.
- The PROFINET specification is updated as part of the IEC 61158 maintenance cycle.
- First practical applications are expected when IEC/IEEE 60802 is adopted, from 2021.

## Sources

1. [PROFINET over TSN](https://www.profibus.com/technologies/profinet-over-tsn) (accessed 2026-10-25)

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