嵌入式网络数控技术与系统

指出基于通用PC的数控技术存在系统资源与需求不匹配、操作系统不适应于实时控制、系统的核心硬软件不具有自主知识产权等问题,认为嵌入式技术是网络数控技术与系统未来发展的方向之一.提出一种基于嵌入式技术的网络数控系统硬件和软件体系,开发与仿真环境.硬件结构由显示及输入装置、嵌入式数控单元、嵌入式可编程序逻辑控制器、嵌入式伺服控制模块、高速现场总线和以太网共同组成,软件体系结构由控制与运算软件、组态软件模块、嵌入式操作系统、辅助设计系统和控制仿真系统组成,能够实现基于通用PC数控系统的所有功能.规划了嵌入式网络数控软件自动生成与辅助开发过程,以及嵌入式可编程序逻辑控制器辅助开发与软件生成过程.提出嵌入式新型网络数控系统中央数控单元硬件实现方案,搭建起中央数控单元先进精简指令集处理器和数字信号处理器的软件架构.基于嵌入式技术的网络数控系统的最大特点是中央数字控制单元不再是一个通用的计算机系统,而是一个嵌入式计算机系统,不但运算能力强、结构灵活和成本低廉,而且具有通用性强、可组合、易扩展、可伸缩和开放性等特点.

EMBEDDED-BASED NETWORK NUMERICAL CONTROL TECHNOLOGY AND SYSTEM

It is indicated that the general-purposed PC-based numerical control (NC) technology suffers from a number of problems, such as mismatch between system resources and application needs, unsuitability of the operating system to real-time control, lack of self-owned intellectual properties (IP) etc. Further embedded technology is one of the future develop- ment directions of network numerical control. The hardware and software architectures for the embedded-based network numerical control as well as the relevant development and simulation environments are proposed. The hardware structure of the system consists of input and display device, NC unit, PLCs, servo modules, high-speed fieldbuses, and Ethernet etc, all of which are embedded-based. The software system is com- posed of embedded operating system, control and computation components, various other composable modules, design assis- tance system, simulation system etc. The embedded-based NC system can realize all the functions that a general-purposed, PC-based NC system can provide. The development assistance process and auto-generation process for the embedded-based network numerical control software are presented, as well as those for embedded-based PLCs software. A hardware imple- mentation scheme for the embedded-based network numerical control is proposed, and the software architectures of ARM and DSP modules of the central NC unit are introduced. The mostly distinguishing feature of the embedded network numerical con- trol system is that the central numerical control unit is not a general-purposed PC system, but an embedded system instead. The system not only has high computation capacity, flexible structure and low cost, but also is general, combinable, scalable and open.