NUM系统的开放程度优于其它的数控系统，其中包括CNC和PI，C功能的开放性，如：用户宏程序的编程、高级语言编程、外部参数编程（E参数可以读写CNC内部许多信息）、G代码的自定义、M功能调用子程序、PLC和NC的交换区大量信息的交换，DNCIOOO功能（可以读写NC几乎所有的信息）等 The openness of the NUM system is superior to other CNC systems, including the openness of CNC and PI and C functions, such as user macro programming, high-level language programming and external parameter programming (E parameter can read and write many internal information of CNC) , G code custom, M function call subroutine, PLC and NC exchange area exchange of large amounts of information, DNCIOOO function (you can read and write almost all NC information), etc.