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PLC可编程控制器是以微处理器为基础,综合了计算机、自动控制和通讯技术发展而来的一种新型工业控制装置。广泛应用于钢铁、石油、化工、电力、建材、机械制造、汽车、轻工、交通运输、环保以及文化娱乐等各种行业。它具有结构简单、编程方便、可靠性高等优点,已广泛用于工业过程和位置的自动控制中。由于PLC具有对使用环境适应性强的特性,同时其内部定时器资源十分丰富,可对目前普遍使用的“渐进式”信号灯进行精确控制,特别对多岔路口的控制可方便地实现。因此现在越来越多地将应用于交通灯系统中。同时,PLC本身还具有通讯联网功能,将同一条道路上的信号灯组成一局域网进行统一调度管理,可缩短车辆通行等候时间,实现科学化管理。因此该论文主要针对控制教学当中常用到的程序控制进行分析对比,让学生从继电器控制线路慢慢转变,并熟练掌握PLC程序控制(梯形图和指令表)不同用法,编程技巧,程序调试方法。模拟应用技术解决实际控制问题的全过程。
PLC programmable logic controller is a microprocessor-based, integrated computer, automatic control and communications technology developed from a new type of industrial control devices. Widely used in steel, petroleum, chemical, electric power, building materials, machinery manufacturing, automotive, light industry, transportation, environmental protection and cultural entertainment and other industries. It has the advantages of simple structure, convenient programming and high reliability. It has been widely used in the automatic control of industrial processes and locations. Because PLC has the characteristics of adaptability to the use of the environment, and its internal timer is very rich resources, the currently widely used “progressive ” signal lamp for precise control, especially for the control of the fork can be easily achieved. So now more and more will be applied to the traffic light system. At the same time, PLC itself also has the communication network function, the signal light on the same road form a LAN for unified scheduling management, can shorten the vehicle waiting time, to achieve scientific management. Therefore, the thesis mainly analyzes and contrasts the program control commonly used in control teaching, which enables students to slowly change from the control circuit of the relay and master the different usages, programming skills and program debugging methods of PLC program control (ladder diagram and instruction list). Simulation of application technology to solve the actual control of the entire process.