【正文】
ead use of progressive light accurately control, particularly easily realize more control of the crossroads. Because of PLC work munication function, has the same path can be posed of a LAN for signal unified dispatching management, can shorten the time of waiting vehicles, scientific management. In actual application of PLC control, urban traffic lights, can according to different conditions, modified at any time to change control procedures, the signal of working time and working conditions. And relay or logic circuit control system, PLC control system has higher reliability and flexibility and economic and practical. This paper is the application of the principle of PLC to control the traffic intersection, introduced in traffic system based on PLC is introduced, and the application of PLC system of basic principle. Key words 4 Traffic control system; Programmable logic controller (PLC) ; Crossroads ; Scientific managemen; Stabilization; reliability 5 基于 PLC 交通燈控制系統(tǒng)的設(shè)計 1 可編程序控制器 PLC 的概況 PLC 的定義 早期的可編程控制器是為了取代繼電器控制線路,采用存儲器程序指令完成順序控制而設(shè)計的。由于 PLC 本身具有通信聯(lián)網(wǎng)功能,可將同一條道路上的信號燈組成一局域網(wǎng)進行統(tǒng)一調(diào)度管理,可縮短車輛 通行等候時間,實現(xiàn)科學(xué)化管理。 2 中 文 摘 要 傳統(tǒng)的交通燈控制系統(tǒng)大多是由數(shù)字電路來實現(xiàn)的,交通燈控制系統(tǒng)穩(wěn)定性可靠性與抗干擾能力較差,隨著社會經(jīng)濟的發(fā)展,數(shù)字電路交通燈越來越不能滿足日益增長的交通壓力,因此必須尋求一種新的方法來取代這種復(fù)雜而工作不穩(wěn)定的控制系統(tǒng)。所以交通燈設(shè)計的合理與否,就顯得尤為重要,對解決交通擁堵問題具有重要意義。特別是近十幾年,隨著我國經(jīng)濟的發(fā)展,城市人口與機動車輛的增多,城市交通問題越來越受到人們的關(guān)注。目 錄 前言 ................................................................ 1 中文摘要 ............................................................ 2 英文摘要 ............................................................ 3 1 可編程序控制器 PLC 的概況 .......................................... 5 PLC 的定義 ...................................................... 5 PLC 的工作原理 .................................................. 5 PLC 的應(yīng)用領(lǐng)域 .................................................. 6 PLC 的發(fā)展趨勢 .................................................. 7 2 控制要求 .......................................................... 9 交通燈控制系統(tǒng)的設(shè)計要求和工作過程 .............................. 9 交通燈的時序波形圖 ............................................. 10 3 硬件介紹和選取 ................................................... 11 4 交通燈系統(tǒng)的設(shè)計與控制 ........................................... 14 順序圖 ......................................................... 14 I/O 分配及接線圖 ............................................... 15 編制程序 ....................................................... 16 調(diào)試程序 ..