描述
目前PLC与PC机的链接通信有两种方式，一种是PC机始终处于主导地位，数据的传送都由PC机定时发出命令，另外一种是PLC始终具有优先权。在本电梯模型监控系统中所有的控制信号均为开关量信号，考虑到上位PC机仅实时显示电梯的运行状态，不需向PLC发送控制指令，采用第二种通信方式。利用PLC循环扫描的特点，设备状态一旦改变，PLC立即检测到
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