【畢業(yè)設(shè)計(jì)論文】基于plc的交通燈控制器設(shè)計(jì)與實(shí)現(xiàn)(已修改)
2024-12-15 11:23 本頁(yè)面
【正文】 基于PLC的交通燈控制器設(shè)計(jì)與實(shí)現(xiàn)摘 要PLC可編程序控制器是以微處理器為基礎(chǔ)，綜合了計(jì)算機(jī)技術(shù)、自動(dòng)控制技術(shù)和通訊技術(shù)發(fā)展而來(lái)的一種新型工業(yè)控制裝置。它具有結(jié)構(gòu)簡(jiǎn)單、編程方便、可靠性高等優(yōu)點(diǎn)，已廣泛用于工業(yè)過(guò)程和位置的自動(dòng)控制中。據(jù)統(tǒng)計(jì)，PLC、機(jī)器人、CAD/CAM將成為工業(yè)生產(chǎn)的三大支柱。由于PLC具有對(duì)使用環(huán)境適應(yīng)性強(qiáng)的特性，同時(shí)其內(nèi)部定時(shí)器資源十分豐富，可對(duì)目前普遍使用的“漸進(jìn)式”信號(hào)燈進(jìn)行精確控制，特別對(duì)多岔路口的控制可方便地實(shí)現(xiàn)。因此現(xiàn)在越來(lái)越多地將PLC應(yīng)用于交通燈系統(tǒng)中。本設(shè)計(jì)是以PLC控制為核心的交通燈，選用西門子S7200系列CPU226型主機(jī)，5個(gè)EM222 （DO8直流24V）型數(shù)字量擴(kuò)展模塊，并利用定時(shí)、計(jì)數(shù)器作定時(shí)計(jì)數(shù)用，LED七段數(shù)碼管作為計(jì)時(shí)顯示用。利用CPU226的2個(gè)輸入點(diǎn)作為啟動(dòng)按鈕和停止按鈕，16個(gè)輸出點(diǎn)和一個(gè)EM222擴(kuò)展模塊的輸出點(diǎn)作為東西方向和南北方向的左轉(zhuǎn)、右轉(zhuǎn)、直行的紅、黃、綠燈。并利用4個(gè)EM222的28個(gè)輸出點(diǎn)分別作為東西方向和南北方向的數(shù)碼管個(gè)、十位顯示輸出。本交通燈系統(tǒng)簡(jiǎn)單，實(shí)用性強(qiáng)，成本低，使用維護(hù)方便，軟件功能強(qiáng)，運(yùn)行穩(wěn)定可靠等優(yōu)點(diǎn)。關(guān)鍵詞：PLC，交通燈，倒計(jì)數(shù)，顯示 Abstract PLC programmable logic controller is a microprocessorbased, integrated puter technology, automatic control technology and munication technologies developed from a new type of industrial control devices. It has a simple structure, easy programming, high reliability, has been widely used for industrial process and location of the automatic control. According to statistics, PLC, robotics, CAD / CAM will be the three pillars of industrial production. The use of the PLC has the characteristics of environmental adaptability, while its internal timer resources are very rich, the current widespread use of the progressive signal for precise control, particularly control of multifork can be easily achieved. Therefore, the PLC is now increasingly used in traffic lights system. The design is based on PLC control as the core of the traffic lights, use of Siemens S7200 series CPU226type host, 5 EM222 (DO8 DC 24V) digital expansion modules, and use regular, routine counting counter, LED seven segment Used as a digital time display. Using CPU226 of the two input points as the start button and stop button, and 16 output points and an EM222 expansion module39。s output points as the direction of eastwest and north and south turn left, turn right, go straight red, yellow, green. EM222 using 4 output points, respectively, of 28 eastwest and northsouth direction as t
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