PLC课程设计交通灯.doc

摘要 交通信号灯的出现，使交通得以有效管制，对于疏导交通流量、提高道路通行能力，减少交通事故有明显效果。为了实现交通道路的管理，力求交通管理先进性、科学化,用可编程控制器实现交通灯管制的控制系统，以及该系统软、硬件设计方法，实验证明该系统实现简单、经济，能够有效地疏导交通，提高交通路口的通行能力。本设计用PLC来实现对十字路口交通灯的控制，其控制方法是采用西门子的S7-200系列CPU224型号PLC对东西南北的红、黄、绿灯实现由规律的循环闪亮，以达到对交通信号灯的控制。 该系统选用PLC来实现交通信号灯控制有利于实现整个系统的自动化和现代化，有利于用简单而实用的程序来完成比较完善的功能，有利于缓解交通压力和减少交通事故。对PLC控制系统进行软、硬件设计，并通过实验证明该系统简单、经济、具有较高的实用价值。 关键词：PLC S7-200， 交通信号灯，PLC控制系统 Abstract The appearance of the traffic signal lamp, so that traffic can be effective control, for ease traffic flow, increase road capacity, the effect of significantly reducing traffic accidents. In order to realize the traffic management, traffic management, to advanced science, with the programmable controller to control traffic lights control system, and the system hardware and software design method, experiment proves that this system is simple, economic, and can effectively improve the flow of traffic, traffic capacity. This design using PLC to achieve the control of traffic lights at crossroads, its control method adopts Siemens S7-200series CPU224type PLC on the four corners of the world red, yellow, green achieved by regular cycles of shiny, in order to achieve the control of traffic signal light. This system uses PLC to realize the traffic signal lamp control is conducive to the realization of the whole system of the automation and modernization, it is beneficial to use simple and practical procedure to complete the perfect function, can alleviate the traffic pressure and reduce traffic accidents. The PLC control system software and hardware design, and the experiment proved that the system is simple, economic,and has high practical value. KEY WORDS: PLC S7-200, traffic signal lamp, PLC control system 目 录 1 绪 论 1 1.1 概述 1 1.2 可编程控制器的简介 2 1.2.1 PLC的应用 2 1.2.2?PLC的特点 4 1.2.3 PLC的结构和工作方式 5 1.2.4 PLC编程语言 5 1.3 设计的主要内容 7 2 PLC控制系统设计概要 8 2.1 设计的基本原则和内容 8 2.2 设计的步骤和实现过程 9 3 交通信号灯控制系统的硬件