Research And Design Of The Programmable Controller Ladder Compiler

Along with the increasing development of industrial control technology, the application of PLC is more and more extensive, the role of it in industrial control field is also obvious.Paper discussed soft PLC, include its superiority and the principle of PLC compile principle, emphasize studied PLC ladder digram compile technology. On studying the foundation of compile kernel further, with the form of grammar for PLC ladder digram go on abstract, analysis and definition, suggested that using LR analysis law to seek the train of thought of grammar, and make using grammar Dao as the semantic analysis of the method complete translation. On this foundation, with VB for tool have designed a ladder digram to instruction code.The research of PLC Ladder Digram language to compile into instruction code have positive promote meaning, for having based on emulation and the automatic control systematic design of PLC, it has very good and practical worth.