The Research Of Develop System For SoftPLC Faced To Numeric Control

Open numerical control system is the research hotspot of NC technology now. With the development of the performance of high speed, high efficiency, high precision and intelligence, more and more functions which makes the software carry out all of the NC functions and minimize the scale of hardware are demanding. Machine logic, the kernel of the whole motion control, is necessarily realized through software too, which accelerates the development of SoftPLC. As to it's therefore launch a research, have important theories with actual meaning.The softPLC technique of this paper research is a newly arising control technique in the field of industrial automation&control technology based on PC. It has a great many advantages of open control system, stronger data processing and network communication capacity compared with traditional PLC, and meets need of modern industrial automation.This paper first introduced PLC, softPLC and PAC-The heat that studies nowadays order. Made to correspond to them also of comparison. Then introduced SERCOS interface, SERCANS and SoftSERCANS. At this foundation on, the paper introduces the architecture of SoftPLC system and presents a method for realizing the SoftPLC programming system according to programming standard. This programming developing software of this paper research development develops with VC++6.0 includes the functions of ladder diagram(LD) and instruction list(IL) editing and compiling,the compiling function includes the transition from LD to IL, the transition from IL to LD, handling for LD and IL programming syntax error, and the transition from IL to objective code. The data structure and algorithm being used is introduced in detail in this paper. A program example is used for validating the function, it proves that the editing and compiling function of system can work jointly correctly, and the objective code according to the prescribed format is obtained.In order to coordinate with SoftPLC developing system running on PC to carry out corresponding control function,an running system of SoftPLC is designed and developed. The paper introduces in details hardware structure and development process of its operation system. It is basic to complete 5 main functions that the softPLC running system.