PLC一般具有豐富的通訊模塊可供選擇,多數(shù)PLC的CPU模塊具有一到兩個(gè)串口。由于這些串口多支持從(Slave)方式通用協(xié)議,智能設(shè)備也多為從方式,兩者通訊不能實(shí)現(xiàn)。有些串口雖支持主(Master)的通訊方式,但通訊協(xié)議多為不公開的專有協(xié)議,智能串口設(shè)備很少能支持這些協(xié)議。因此,解決方法之一是采用一種裝置,它一側(cè)接入PLC串口,另一側(cè)接入智能設(shè)備。該裝置起協(xié)議轉(zhuǎn)換作用,而且它對(duì)兩側(cè)都可以是主方式。這種方式可以接入較多串口設(shè)備。這是一種很有前途的、比較經(jīng)濟(jì)的方式,可以適用每一種PLC產(chǎn)品
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