可编程控制器(PLC)是以微处理器为核心的通 - 山东（Programmable logic controller (PLC) is based on microprocessor as the core of Shandong）.doc

可编程控制器(PLC)是以微处理器为核心的通 - 山东（Programmable logic controller (PLC) is based on microprocessor as the core of Shandong） Principles of programmable logic controller and its application Programmable logic controller (PLC) is a universal industrial automation device with computer technology as its core. It will be the traditional relay control system and computer technology together with high reliability, flexible, easy to program, easy to use, so in recent years in industrial automatic control, electromechanical integration, transformation of traditional industries has been widely used. It is regarded as one of the three pillars of modern industrial production automation. Therefore, our electrical automation specialty has opened the course of the principle and application of programmable logic controller, and positioned it as a trunk specialized course. In the last few years of the teaching process has the mechanical industry publishing house of the PLC technology, Chongqing University Press published the programmable controller programming method and engineering application. In particular, the compilation of the textbook principles and applications of programmable logic controllers organized by the Tsinghua University press has been published in February 2005 and applied to the teaching of this semester. Starting from the practical application in the teaching, based on MITSUBISHI FX2N series PLC is modeled on the allocation of system characteristics, small programmable controller principle, system in detail, the instruction system, especially in recent years the application of more functional instruction makes a systematic and detailed introduction. The introduction of analog control, network communication and other functional modules have brought convenience to the application of PLC. Programming is the key problem of PLC application. According to the characteristics of higher vocational education, the PLC programming method is introduced, including the ladder diagram e