PROFINET
Real-time industrial Ethernet from PI (RT and IRT).
PROFIBUS & PROFINET International's industrial Ethernet: RT over standard switches for millisecond control, IRT with scheduled hardware-assisted cycles for motion. Conformance classes A–D describe device capability; PROFIdrive, PROFIenergy, and PROFIsafe extend it.
See also: TSN · EtherNet/IP · Functional safety