题目： 基于 PLC 的四层电梯控制系统设计系部：信息技术系专业：电子信息工程学号：学生姓名：指导教师姓名：指导教师职称：二○一○年五月八日目 录摘要 ................................................................... 1PLC-based four-story elevator control system design ...................... 2引言 ................................................................... 3第一章 可编程控制器 ...................................................... 51.1、可编程控制器的介绍 .................................................................................................................. 51.1.1 定义 ..................................................................................................................................... 51.1.2 PLC 的构成 ......................................................................................................................... 51.1.3 CPU 的构成 ......................................................................................................................... 51.1.4 I/O 模块 ............................................................................................................................... 61.1.5 电源模块 ............................................................................................................................. 61.1.8 PLC 的通信联网 ................................................................................................................. 71.2 可编程控制器的选用 ..................................................................................................................... 71.2.1、PLC 控制系统的I/O 点数计算 ....................................................................................... 71.2.2 PLC 的型号选择 ................................................................................................................. 8第二章 硬件接线 .......................................................... 92.1 外部接线图 .......................
