毕毕 业业 论论 文文基于 PLC 的自动送料小车的控制系统设计学生姓名：XX专业班级：自动化 2011 级 2 班指导教师：XXX 教授学 院：机电工程学院2015 年 6 月基于基于 PLC 的自动送料小车的控制系统设计的自动送料小车的控制系统设计摘要PLC，即可编程逻辑控制器，由于其具有使用方便，编程简单，可实现功能强大，性能价格比值高，需求硬件配套齐全，可适应性极强，可靠性较高，而且抗干扰能力强，适应较为恶劣环境，系统的设计、安装、调试工作量少，同时故障维修方便等特点，使得其应用领域越来越普遍，从早期的适用于继电器的配套产品，到现如今的广泛出现于各类控制系统存在的地方。并且，随着科学技术的日益发展，PLC 在功能上得到明显提升，正在被全球广泛使用，其地位愈加显著，成为我们生活工作不可替代的一部分。我们大家都知道，在以往的工作环境现场用来运输的小车普遍都是用继电器，但众所周知，继电器有着很多明显的不足，例如，检查维修不容易，并且继电器控制故障的出现也较为频繁，同时需要的接触点，端点接线也是十分复杂的，相比于继电器，PLC 有着很多明显的优势，不仅在工作场合，在整个市场营销等环节也有着突出的地位，是现在引领潮流的控制器，所以，不选择继电器而是更多地用 PLC 来代替已经成为发展的方向。此次运料小车的控制设计，使得在生产生活中手动与自动的生产方式得以明显结合，提高了工作效率，降低了工作成本，通过搭配智能寻路等附加功能，大大增加了送料小车的工作能力，同时能处于恶劣环境工作的特点，使送料小车的优势更加明显，工作范围更为广泛。本文以送料小车整体的构想和设计方案为切入，首先第一章介绍了送料小车意义背景，自动送料小车在如今国内外工业中的使用现状，以及使用 PLC 控制的选择原因；第二章介绍了送料小车的整体构想，逻辑语言流程图，小车总体模拟图；第三章进行编程软件及选择的 PLC 的介绍；第四章包括软件编程，包括程序梯形图，PLC 端口接线图，得出结论。关键词关键词 送料小车，PLC，自动控制The design of the control system of the automatic feeding car based on PLCAbstractPLC, programmable logic controller, because of its easy to use, simple programming, can achieve a powerful, high ratio of performance to price, demand complete hardware, strong adaptability, high reliability, and strong anti-interference ability, suitable for bad environment, system design, installation, commissioning work less, also fault maintenance is convenient wait for a characteristic, the application domain is more and more common, from early for relay of ancillary products, to todays widespread in all kinds of control system. And with the increasing development of science and technology, PLC in function get improved significantly, is being widely used in the world, its position is more and more significant to become part of our life and work can not be replaced.We all know, used to transport cars are generally relay, but it is well known that relays have a lot of obvious deficiencies in previous work environment field, for example, inspection, maintenance is not easy, and the relay control failures occur more frequently, takes a while to get the contact point, terminal is very complex, compared to in the relay, PLC has lots of advantages, not only in the workplace, in the entire marketing process also has a prominent position, is now to lead the trend of the controller, so not to choose the relay and is more with PLC to replace has become the development direction. The transport dolly control design, so that in production and life in manual and automatic mode of production can be binding significantly, improve work efficiency, and reduce the cost of the work, the collocation through intelligent routing and other additional features, greatly increasing the feeding dolly, and characteristic of poor working conditions in, feeding dolly the advantage is more obvious, the scope of work is more widely.This paper to send Dolly the overall conception and design scheme as the breakthrough, first of all, the first chapter introduced feeding trolley background, automatic feeding dolly in nowadays industry at home and abroad in the use of the status, and of the use of PLC control choice; in the second chapter, we introduce the whole idea of Dolly, logical language flow chart, the car overall simulation diagram; the third chapter introduced the PLC programming software and the choice of; the fourth chapter includes software programming, including programming ladder diagram, PLC port wiring diagram, and draw a conclusion.Keywords feeding car, PLC, automatic control目录目录摘要摘要Abstract1 绪论绪论 .11.1 选题意义及背景.11.2 工业系统中的现状.21.3 PLC 控制的优点.42 总体设计方案总体设计方案 .72.1 送料小车的方案选择.72.2 系统整体思路构想.93 STEP7 与与 S7-200.113.1 STEP7 功能介绍.113.2 S7-200 简要介绍 .154 程序分配设计程序分配设计 .164.1 I/O 分配表及接线图.164.2 梯形图分段设计.