
1747-L551
1747-L551
1747-L551
【厦门光沃自动化设备有限公司】
2 监控原理
2.1 通信方法
【联 系 人:陈小姐】
【免费热线:0592-5709825】
【24小时开机:18030229053 】
【工作QQ: 2479261344】
上位机作为主站要能够通过PLC监控下层设备的状态,首先要实现上位机与PLC间的通信。由于串行通信具有线路简单、应用灵活、可靠性高等优点,并且普通计算机均带有串行口,所以PC与PLC间通常采用串行通信方式。串行通信可以通过WINOOWs的API函数实现,也可以串行通信控件实现,但后者较容易,本文采用VB的通信控件。如果只实现对一台CPM1APLC的监控,需要CPM1-CIFO1(OMRON提供的专用的RS232适配器)形成RS232C口与上位机通信;如果是实现对多台PLC的监控,则需用RS232—RS422/RS485转换器ADAM-4520和CPM1-CIF11(OMRON提供的专用RS422适配器)与上位机通信,最多可连接32台PLC
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