PROFINET

PROFINET is an industrial Ethernet standard for exchanging data between controllers and field devices such as drives, I/O and robots. Cyclic process data travels on a real-time channel, and configuration and diagnostics use standard IP communication. It is maintained by PROFIBUS & PROFINET International (PI).

Source checked18/18 values · 2026-10-25

Specification

2 sources

Transports	udp
Architecture	producer consumer
Encoding	binary
Standard body	PROFIBUS & PROFINET International (PI)
Standard ref	IEC 61158 / IEC 61784

Default ports

IANA assignments

34962UDPPROFINET RT unicast

34963UDPPROFINET RT multicast

34964UDPPROFINET context manager

34965UDPPROFINET secure connection management and key provisioning

34966UDPPROFINET secure real-time data transfer over UDP (unicast and multicast)

Study notes

Three conformance classes build on each other: CC-A (standard Ethernet, basic functions), CC-B, and CC-C (deterministic, isochronous transmission).
RT (real time) carries process data. IRT (isochronous real time) is for motion control and needs hardware support in the device.
Devices must be certified by an accredited PI Test Laboratory.
Cyclic RT process data travels directly on Ethernet layer 2; this registry lists only the UDP ports IANA assigns.