PLC交通红绿灯设计..doc

目录 摘 要 I ABSTRACT II 第1章 绪 论 1 1.1 设计目的 1 1.2 设计的主要内容 1 第 2 章 PLC的结构及设计原理 2 2.1 PLC的结构 2 2.2 PLC的分类 2 2.3 PLC的工作原理 2 2.4 PLC设计交通灯所用指令介绍 3 第3章 程序编写 6 3.1 控制要求 6 3.2 依据要求画时序图 6 3.3交通灯程序图 7 程序调试 11 结 论 12 致 谢 13 参 考 文 献 14  摘 要 本次课程设计主要能完成：用PLC进行编程完成交通十字路口红绿灯的设计，控制对象：南北主干道和东西主干道各有六个交通灯，其中左转有红、黄、绿三个；直行有红、黄、绿三个；南北人行道和东西人行道各有红、黄、绿三个交通灯。先根据要求画出时序图，再利用CX-Programmer软件进行编程，并用Microsoft Office Visio 2003软件画出模拟现场十字交通路口，使编程更容易让人接受看懂。应用PLC可编程技术，是因为现今很多工程已经运用了PLC来设计程序，可编程控制器(PLC)以微处理器为核心，普遍采用继电接触器控制系统的梯形图语言进行程序设计，编程容易，功能扩展方便，修改灵活结构简单，抗干扰能力强。可编程控制器指令丰富，可以接各种输出、输入扩充设备，有丰富的特殊扩展设备，其中的模拟输入设备和通信设备是控制要求与特点，能够方便地联网通信。ABSTRACT The curriculum design is mainly to complete the traffic intersection traffic lights design, control object: North and south main roads and trunk road, there are six traffic lights, which turn left turn red, yellow, green three; straight line is red, yellow, green three; North and West Road and East and West are red, yellow, green three traffic lights, and CX-Programmer software for the programming, and Office Visio Microsoft 2003 software to make programming more easy to understand. The reason why the application of PLC technology, because many projects have been using PLC to design procedures, because the programmable controller (PLC) to the core of the system, the general use of the relay contactor control system based on the electrical schematic diagram of the program design, easy to extend, easy to expand, flexible, and simple structure, strong anti-interference ability. SIEMENS programmable controller instruction is rich, can be connected to a variety of output, input expansion equipment, a wealth of special equipment, in which the analog input devices and communications equipment is in line with the requirements of traffic light control Keywords：Traffic lightechnology; Ladder diagram  绪 论 1.1 设计目的 在十字路口设置交通灯可以对交通进行有效的疏通，并为交通参与者的安全提供了强有力的保障。但是随着社会、经济的快速发展，原先的交通灯控制系统已经不能适应现在日益繁忙的交通状况。如何改善交通灯控制系统，