总线式数控系统技术总线处于设备的底层，有协议简单、容错能力强、安全性好、成本低的特点，不仅能使系统与外部装置之间高速传输大量的数据，从而满足高精高速的加工需求，而且能简化系统便于扩展。

　　为了实现国产数控系统现场总线的标准化，“数控系统现场总线技术标准联盟”制定了NCUC-Bus现场总线（Numerical Control Union of China-Bus中国数控联盟总线），现场总线在数控领域的应用日趋广泛，总线型数控系统成为目前中高档数控系统的主流。

　　Fieldbus standardization, in order to achieve the domestic nc system "Numerical Control system of field Bus technology standard alliance" formulated the NCUC - Bus field Bus (Numerical Control Union of China - Bus China CNC Union Bus), field Bus is widely used in the field of CNC, general linear Numerical Control system become the mainstream of high-grade CNC system at present.