描述
设备连锁和控制等会采用几种不同型号的PLC系统。为了在企业内建立综合管理信息系统，异种系统的互联和时间同步就成为很重要的问题。早期DCS和PLC的互连是采用把PLC作为DCS的一个输入板，DCS专家们设计一块与PLC的接口板，与DCS的本身的I/O板连在同一条I/O总线上。控制器读入PLC来的信号，通过DCS的网络把PLC的信号送到DCS操作站上。这
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