目录1 绪论...................................................................................................................................................22 整体方案的选择...............................................................................................................................22.1 设备概况................................................................................................................................22.2 竞赛抢答器的控制要求........................................................................................................23 硬件电路设计..................................................................................................................................33.1 控制特点分析........................................................................................................................3图 3-1 系统系统控制图.............................................................................................................43.2 PLC 机型的选择步骤与原则................................................................................................43.3 流程图....................................................................................................................................54 软件设计..........................................................................................................................................74.1 I/O 分配..................................................................................................................................74.2 根据控制要求进行梯形图设计..........................................................................................104.3 指令表..................................................................................................................................224.4 程序调试..............................................................................................................................245 总结...........................
