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2023-01-28 - 04:07

Real Time Linux Workshops

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Ninth Real-Time Linux Workshop on November 2 to 4, 2007, in Linz, Austria

Exploiting the hard realtime features of PROFINET by a realtime capable Linux

Karl-Heinz Krause

A PROFINET system build with ERTEC ASICs allows to keep the nodes of a net synchronized with an accuracy below 1µsec. While still allowing regular IP-communication, it also guarantees the timely arrival of cyclic messages below that mark. These features are particulary required for the motion control part of an automation systems. The talk starts with browsing through the essentials of PROFINET and the ERTEC ASIC which make up for realtime the capabilities. When connecting such an ethernet controller as the ERTEC to a host processor, the HW-interfaces also have a significant impact on the realtime behavior. These issues are also discussed. Finally all the measures for providing best possible realtime response for a Linux user level program are presented. This includes the basic features of the chosen two kernel approach as well as the functional enhancements necessary for meeting the specific requirements of drive control applications. At the end the achieved performance data are presented.


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