Abstract
Siemens A&D recently released the third version of PROFInet, which extends the network into motion control applications, called real-time or IRT, the new scheme allows jitter accuracy of one millisecond. PROFInet v3 involves some reengineering of standard Ethernet. All stations on a PROFInet v3 network, including the network nodes, must be precisely synchronized. For isochronous real-time Ethernet, the switches are synchronized to the communication cycle with accuracy in the sub-microsecond range. For Seimens and their partners, the key to deploying 'hard' real-time Ethernet is in the special IRT switches.
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