毕业论文--电梯的排队系统设计.docVIP

xxx学院本科毕业设计(论文) 电梯的排队系统设计 学生姓名： 学生学号： 院(系)： 年级专业： 指导教师： 教授 助理指导教师： 二〇一三年六月 摘要 关键词可编程控制器；变频调速；电梯驱动 Along with the development of modern economy and city life, the elevator has become a essential walking tool for people in daily life, and the performance of elevators obviously influences people’s lives. The traditional elevator system based on relay largely decreases the reliability and security since the mechanical and electromagnetic inertia of relay is big In order to ensure the efficiency and reliable securities, the control method of elevator must be changed. The programmable logic controller(PLC),which develops based on sequence logical control, is digital operation electronic device specialized in the industrial application environment. PLC possesses fast process speed and high reliability. Therefore, PLC can be able to ensure the elevator run normally, securely and reliably. In addition. The drive method of elevators has replaced the DC velocity modulation with frequency control due to the development of AC frequency control of motors. The frequency control not only satisfies the comfort sense of passengers and ensures the stable precision, but also decreases the loss of power, saves resources and reduces expenses. The frequency control method based on PLC is applied to the elevator system, queuing system design on the basis of elevator. Keywords：The programmable logic controller；Variable frequency control；The elevator drive  目 录 错误！未定义书签。4.5.1控制环节要求 24 5 软件设计 25 5.1程序框图设计 25 5.2 I/O(输入/输出)端口分配 26 5.3 外部接线图 26 5.4 梯形图 28 5.5梯形图控制分析 42 6 总结 44 参考文献 45 致 谢 46  1 绪论 1.1 可编程控制器的概念 可编程控制器简称PC(英文全称：Programmable Controller)，它一共经历了以下几个时期：可编程序矩阵控制器PMC、可编程序顺序控制器PSC、可编程序逻辑控制器PLC(英文全称：Programmable Logic Controller)和可编程序控制器PC。以便与一般计算机(PC)相区别，现在仍然在继续称为可编程逻辑控制器。 在工业环境下，PLC是为了更方便使用而为之设计的一种电子装置可以进行数字运算操作。它应用了存储器可以程序编制，在其内部存储中，被用作