说明：  PROFINET 概述 ● PROFINET 的结构和网络组件 ● PROFINET IO 中的传输方法 ● PROFINET IO 中的工程组态和诊断 ● PROFINET CBA 中的工程组态和诊断
(PROFINET overview PROFINET structure and network components transmission method in PROFINET IO engineering configuration and diagnosis in PROFINET IO engineering configuration and diagnosis in PROFINET CBA)