1.4 可编程控制器的机型选择...................................................................................................2
1.4.1 PLC 的 I/O 点数估算 .............................................................................................2
1.4.2 响应时间....................................................................................................................2
1.4.3 输入输出模块的选择................................................................................................2
1.4.4 机型的确定................................................................................................................3
1.5 控制电路系统设计...............................................................................................................3
二、系统硬件设计.............................................................................................................................4
2.1 电梯模型介绍.......................................................................................................................4
2.2 输入输出分配表...................................................................................................................5
2.3 PLC 接线图...........................................................................................................................6
三、系统软件设计.............................................................................................................................7
3.1 程序流程图...........................................................................................................................7
3.2 梯形图...................................................................................................................................8
3.2.1 外召唤信号登记及消除............................................................................................8
3.2.2 内指令信号登记及消除............................................................................................9
3.2.3 电梯的平层信号处理..............................................................................................10
3.2.4 选层定向及反向截梯..............................................................................................10
3.2.5 内指令外召唤信号的保持......................................................................................13
3.2.6 各楼层停车信号......................................................................................................15
3.2.7 自动及手动开关门..................................................................................................16
四、系统调试...................................................................................................................................17
4.1 系统调试.............................................................................................................................17
4.2 调试过程中出现的问题及解决办法.................................................................................18
4.3 程序最终调试运行情况.....................................................................................................18
五、结果分析及展望.......................................................................................................................19
附录...................................................................................................................................................20
参考文献...................................................................................................................................20