摘 要
可編程序控制器在工業(yè)自動(dòng)化中的地位極為重要，廣泛的應(yīng)用于各個(gè)行業(yè)。隨著科技的發(fā)展，可編程控制器的功能日益完善，加上小型化、價(jià)格低、可靠性高，在現(xiàn)代工業(yè)中的應(yīng)用更加突出。城市交通燈控制采用的可編程制器具有可靠性高、維護(hù)方便，用法簡(jiǎn)單、通用性強(qiáng)等特點(diǎn)，本文用三菱FX2N的可編程控制器控制十字路口信號(hào)燈來說明可編程控制器硬件、軟件的設(shè)計(jì)。解決好公路交通燈控制問題將是保障交通有序、安全、快捷運(yùn)行的重要環(huán)節(jié)。但現(xiàn)在有的交通信號(hào)燈控制系統(tǒng)都是單一的固定時(shí)序控制，不能夠根據(jù)實(shí)際交通狀況進(jìn)行調(diào)節(jié)控制。三菱系列的可編程序控制器和傳感技術(shù)來實(shí)現(xiàn)對(duì)交通燈的智能信號(hào)控制。可用如下方案來控制交通路況:制作傳感器探測(cè)車輛數(shù)量來控制交通燈的時(shí)長(zhǎng)。具體如下:在入路口的各個(gè)方向附近的地下按要求埋設(shè)感應(yīng)線圈，當(dāng)汽車經(jīng)過時(shí)就會(huì)產(chǎn)生渦流損耗，環(huán)狀絕緣電線的電感開始減少，即可檢測(cè)出汽車的通過，并將這一信號(hào)轉(zhuǎn)換為標(biāo)準(zhǔn)脈沖信號(hào)作為可編程控制器的控制輸入，并用PLC計(jì)數(shù)，按一定控制規(guī)律自動(dòng)調(diào)節(jié)紅綠燈的時(shí)長(zhǎng)。

關(guān)鍵詞： PLC（可編程序控制器）; 三菱FX2N;傳感器探測(cè);交通燈。
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Abstract
The variable procedure controller is in industry automate the position is extremely important, extensive application in each profession. Along with the development of science and technology, the function of the programmable controller is increasingly perfect, plus smallscaled turn, the price is low, the credibility is high, the application that is in modern industry is more out standing. The city transportation light control adopts programmable to make the tool contain high credibility, the maintenance convenience, the method of using is simple, the in general use strong etc. characteristics, this text uses the design that the programmable controller of the Mitsubishi FX2N control intersections conveyance light explains the programmable controller hardware software. Resolve the good highway transportation light control problem will is guarantee the transportation contain preface, safety, fast movement of important link. But the transportation signal beacon control systems have now are all the single and fixed cycle times controls, can't carry on regulating the control according to the actual transportation condition enough. The programmable preface controller of the Mitsubishi series and spread the feeling technique to carry out the intelligence signal control toward the transportation light. Can use as follows the project controls the transportation situation on road: the creation spreads the feeling machine to probe into the vehicle quantity the hour of control the transportation light is long. In a specific way and as follows: The at go the into the underground of the each the direction neighborhood the of the street corner the to lay the to respond the coil the according to the trequest, the be the automobile to the pass by the will produce the to flow the to exhaust, the wreath the form insulates the electricity the feeling of the electric the wire to start reduce, can immediately examine pass of an automobile, and convert this signal control importation that is the programmable controller for the standard pulse signal, counteract the PLC to count, long by the hour that the certain control regulation regulates the traffic lights automatically.

Keywords：PLC( Programmable Logical Controller); Trapezoid; diagram;
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目 錄

摘 要 I
Abstract II
第 1 章 緒論 2
1.1 引言 2
1.2 課題研究背景 2
1.3 現(xiàn)在城市路口交通燈控制技術(shù)現(xiàn)狀 3
1.4 本課題主要研究?jī)?nèi)容 3
第 2 章 PLC功能簡(jiǎn)介 4
2.1 概述 4
2.2 可編程控制器的發(fā)展 5
2.3 主要用途 7
2.4 可編程控制器特點(diǎn) 7
2.5 可編程控制器的組成 9
2.6 PLC的工作原理 9
2.7 主要功能 11
2.8 可編程控制技術(shù)的發(fā)展趨勢(shì) 13
第 3 章 交通燈控制電路的設(shè)計(jì) 15
3.1 PLC正常時(shí)序 15
3.2 I/O地址分配 15
3.3 主程序流程圖 16
3.4 正常時(shí)序情況 17
3.5 急車強(qiáng)通情況 21
3.6 車流滯留情況紅綠燈時(shí)間長(zhǎng)度控制 25
3.7 車流量的計(jì)算 28
3.8 運(yùn)行程序語(yǔ)句表 29
3.9 運(yùn)行效果 30
第 4 章 總結(jié) 31
參考文獻(xiàn) 32


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1.1 引言
十字路口的紅綠燈指揮著行人和車輛的安全運(yùn)行,實(shí)現(xiàn)紅綠燈的自動(dòng)指揮能使交通管理工作得到改善,也是城市交通管理工作自動(dòng)化的重要標(biāo)志之一。可編程序控制器(PLC) 是一種新型的通用的自動(dòng)控制裝置,它將傳統(tǒng)的繼電器控制技術(shù)、計(jì)算機(jī)技術(shù)和通訊技術(shù)融為一體,是專能加強(qiáng)、編程簡(jiǎn)單、使用方便以及體積小、重量輕、功耗低等一系列優(yōu)點(diǎn)。因此,本文介紹了三菱公司的PLC 產(chǎn)品來實(shí)現(xiàn)交通燈的自動(dòng)控制。
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