The Research Of Embedded CNC Based On PC104-bus

In recent years, numerical control system is mostly based on computer.Incontrast to the research pattern based on computer, the embedded model system to design embedded CNC system is a new attempt. Agility, module and reconstruction are the new trends of opening CNC.By Analyzing processing character and embedded opening frame, the framework of numerical control system is built on base of the pc104-bus, it can effectively satisfy the requirement.This paper includes the several following parts:1. On the hardware .The CNC servo system and main spindle diver system are designed. Furthermore, a pc104-bus card which has the functions of timer, digital input,digital output, D/A convertion is also designed, and the design of the print circuit in details is illustrated.2. In RTOS (real time operating system),the system frame of RTOS is analyzed.Based on theory of RTOS, the realization scheme of RTOS in CNC system is brought forward.This paper discusses the necessity and feasibility that embedded ROTS is used in CNC system. Most of the practicable methods put forward to realize real-time control on the PC and the structure of Windows operating system are analyzed .The problem that it is hard to apply real-time control to Windows Operating system is also solved, which depends on the outside Timer-interruption hardware interface joined with VxD device driver.3. By using the design of frame and module,the equipment driver layer is divided into three function modules: control, mutual and connection module.Especially,the paper aims to the design of keyboard driver and display driver in alternation driver .4. Combining the interpolation algorithm, the paper presents a simple analyse, Especially,the paper analyze two interpolation algorithms-- one by one comparison and digital differential analyzer (DDA).In the end, the author concludes her research work and gives his View of the possible trend of the development of the CNC system on base of the pc104-bus.