PROFINET是一种新的实时以太网标准，本文介绍了PROFINET两类不同性能的实时通信的技术特点，并对等时同步实时通信技术进行了分析，说明了其对IEEE1588的改进。

In this paper, isochronous real-time communication of PROFINET is analyzed and enhancements to IEEE1588 are explained after two kinds of real-time communication in PROFINET are introduced.

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