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用户把带异步通信适配器的PC与PLC互联通信时通常采用如图7-12所示的两种结构形式。一种为点对点结构,PC的COM口与PLC的编程器接口或其它异步通信口之间实现点对点链接, 如图7-12a所示。另一种为多点结构,PC与多台PLC共同连在同一条串行总线上,如图7-12b所示。多点结构采用主从式存取控制方法,通常以PC为主站,多台PLC为从站,通过周期轮询进行通信管理。GROUPE SCHNEIDER MODICON TELEMECANIQUE 24VDC 16W Power Supply TSXPSY1610
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