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阐述了开放式ＣＮＣ系统的含义、特点及数控系统实现开放的意义，介绍了基于ＰＣ总线的开放式ＣＮＣ系统硬件和软件的体系结构，指出了发展开放式ＣＮＣ系统需要解决的几个问题和数控技术发展的方向。
The meaning and characteristics of open CNC system and the meaning of open CNC system are expounded. The hardware and software architecture of open CNC system based on PC bus is introduced. Some problems that need to be solved in developing open CNC system are pointed out. The direction of technological development.