目 录
引言 ......................................................................1
1 电梯的概述 ..............................................................1
电梯的发展简史 ...........................................................1
电梯的基本结构 ...........................................................2
2 可编程控制器简介 ........................................................3
PLC 的结构及各部分的作用.................................................4
PLC 的工作原理...........................................................5
PLC 的编程语言...........................................................6
PLC 基本指令.............................................................6
梯形图设计规则 ...........................................................9
3 三层电梯 PLC 控制系统设计 ................................................9
电梯的控制要求 ..........................................................9
三层电梯主电路 ..........................................................9
输入输出点数分配 .......................................................10
PLC 外围接线图..........................................................11
功能指令表概述 .........................................................11
程序分析 ...............................................................12
三层电梯助记符语句程序 .................................................18
本系统的不足及改进 .....................................................24
结 束 语 .................................................................26
致 谢 .................................................................27
附 录 .............................................................28
参考文献 .................................................................31
