Open architecture PLC advantage is that it can extend function module by CAN-BUS, especially module with special function designed by users.

开放式PLC最大特点就是能通过CAN总线方便地扩展功能模块，特别是用户设计的特殊功能模块。

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Taking nc lathe system as an object, the thesis focus on the structure of Open architecture nc system and researches the achievement of auxiliary function of nc lathe system based on PLC.

论文以数控车床控制系统为对象，对开放式数控系统的体系结构进行了研究，以基于PLC的开放式数控车系统为切入点，对开放式数控车系统的辅助功能实现进行了深入研究。

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