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江苏信息职业技术学院
毕业设计论文
Key words: traffic lights, control systems, configuration design
1 可编程控制系统介绍
1.1 PLC 简介
随着微处理器，计算机的和数字通讯技术的飞速发展，计算机控制技术已 经渗透到所有工业领域。当前用于工业控制的计算机可分为:可编程控制器,基 于 PC 总线的工业控制计算机,基与单片机的测控装置,用于模拟量闭环控制的可 编程调节器,集散控制系统(DCS)和现场总线控制系统(FCS)等。可编程控制器是 应用广泛,功能强大,使用方便的通用工业控制装置,已成为当代工业自动化的重 要支柱.近几年，在国内已得到迅速推广普及。
PLC also has a communications networking capabilities, the same signal on the road to form a unified LAN management, and can shorten the waiting time for vehicle traffic, to achieve scientific management. In real-time detection and application of automatic control systems PLC, PLC is often used as a core component.
江苏信息职业技术学院
毕业设计论文
基于 PLC 和 MCGS 的交通灯系统设计 【摘要】
当今，红绿灯安装在各个道口上，已经成为疏导交通车辆最常见和最有效 的手段。社会的发展，人们的消费水平不断的提高，私人车辆不断的增加。人 多、车多道路少的道路交通状况已经很明显了。所以采用有效的方法控制交通 灯是势在必行的。PLC 的智能控制原则是控制系统的核心，采用 PLC 把东西方 向或南北方向的车辆按数量规模进行分档，相应给定的东西方向与南北方向的 绿灯时长也按一定的规律分档. 这样就可以实现按车流量规模给定绿灯时长， 达到最大限度的有车放行，减少十字路口的车辆滞流，缓解交通拥挤、实现最 优控制，从而提高了交通控制系统的效率.
PLC 结构简单、编程方便、可靠性高等优点，已广泛用于工业过程和位置 的自动控制中。由于 PLC 具有对使用环境适应性强的特性，同时其内部定时器 资源十分丰富，可对目前普遍使用的“渐进式”信号灯进行精确控制，特别对 多岔路口的控制可方便地实现。因此现在越来越多地将 PLC 应用于交通灯系统 中。 PLC 还具有通讯联网功能，将同一条道路上的信号灯组成同一局域网进行统一 调度管理，可缩短车辆通行等候时间，实现科学化管理。在实时检测和自动控 制的 PLC 应用系统中，PLC 往往是作为一个核心部件来使用。
关键字：P院
毕业设计论文
Abstract: Today, traffic lights installed on the crossing at all, to ease the traffic of vehicles has become the most common and most effective means. Social development, people's consumption levels continue to increase, private vehicles is increasing. Of people, cars and more roads have less traffic status is obvious. Therefore, the adoption of effective methods to control traffic lights is imperative. PLC intelligent control principle is the core of the control system using PLC north-south direction to east-west direction or scale of the vehicle by the number of sub-file, the appropriate thing given the green light north-south direction and length of time is also subfile according to certain rules. This scale can be achieved given the green light at traffic duration, to achieve maximum release a car to reduce the stagnation of vehicles crossing to ease traffic congestion, to achieve optimal control, thus improving the efficiency of traffic control system.
PLC structure is simple, easy programming, high reliability, has been widely used for industrial process and location of the automatic control. 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 multi-fork can be easily achieved. Therefore, the PLC is now increasingly used in traffic lights system.