毕业论文--基于PLC的交通灯控制系统设计.doc

摘 要 随着社会的不断发展，PLC在工业上的应用更为广泛；工业自动化更为提高。在现在交通灯控制系统中PLC被广泛应用于其中,实现了交通灯科学化管理。 本次设计的题Abstract: With the continuous development of society, PLC applications in industry more widely; more to improve industrial automation.?Traffic light control system, now widely used in the PLC in which to achieve the scientific management of traffic lights. The project topic is: Based on the PLCs traffic light control system Automatic control of traffic lights is a typical example of timing control, the ladder design is the key to the changes of the light time points that come out; time accurate calculation Timer; light flashes the number of counters to achieve with?.Key words： traffic lights PLC Programming  目录 第一章、PLC的特点及应用 1.1 概述 1.2 PLC的特点.......................................................3 1.3 PLC的应用.......................................................5 第二章、PLC的结构及原理 2.1 PLC的分类.......................................................5 2.2 PLC的结构.......................................................5 2.3 PLC的工作原理...................................................8 2.4PLC的编程语言....................................................9 2.5FX2N系列PLC的指令系统..........................................11 第三章、形图的设计与编程方法 3.1 编程方法.......................................................20 3.2 控制工艺和要求.................................................20 3.3十字路口交通灯示意图............................................20 3.4控制时序图......................................................21 3.5 PLC的外部接线图................................................22 3.6 硬件及外围元件.................................................22 3.7 输入输出装置与PLC对应表.......................................23 第四章程序设计 4.1 软件设计.......................................................24 4.2 梯形图.........................................................25 4.3 指令表.........................................................27 第五章、设计总结...................................................29 致谢...............................................................29 参