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概述了ＤＮＣ系统的结构，并设计了一种实用的多点通信系统。针对数控机床的多样性，重点分析了不带ＤＮＣ通信口的辛辛那提Ａ９００系统的联网问题，并以这种简单易行的多点通信结构将５台性能各异的加工中心连成一个ＤＮＣ系统。
The structure of DNC system is summarized and a practical multipoint communication system is designed. In view of the diversity of CNC machine tools, the networking problem of Cincinnati A900 system without DNC communication port is analyzed emphatically. In this simple and easy multi-point communication structure, five machining centers with different performances are connected into one DNC system.