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   　 一個或若干PLC與PC機(jī)聯(lián)出系統(tǒng)，PC機(jī)起到原編程器及人機(jī)界面操作站的作用，這20世紀(jì)90年代的新潮流，這樣為系統(tǒng)集成帶來了商機(jī)，同時編程軟件和人機(jī)界面軟件(監(jiān)控軟件或稱組態(tài)軟件)及軟件接口(或稱驅(qū)動軟件)也得到了發(fā)展。
      近年來，PLC廠家在原來CPU模板上提供物理層RS232/422/485接口的基礎(chǔ)，逐漸增加了各種通訊接口，而且提供完整的通訊網(wǎng)絡(luò)。由于近來數(shù)據(jù)通訊技術(shù)發(fā)展很快，用戶對開放性要求很強(qiáng)烈，現(xiàn)場總線技術(shù)及以太網(wǎng)技術(shù)也同步發(fā)展，所以PLC構(gòu)成的PCS系統(tǒng)比DCS的開放性所處的現(xiàn)狀稍好一些。目前羅克韋爾AB公司已形成了多層結(jié)構(gòu)體系，即Ether Net、Control Net、Device Net及Asi等現(xiàn)場總線(原DH+網(wǎng)也可兼容)。西門子公司在Profibus-DP通訊網(wǎng)絡(luò)及Profibus-FMS網(wǎng)絡(luò)以外，提出了S7 Routing網(wǎng)絡(luò)，即Profibus-DP和Industrial Enternet兩層結(jié)構(gòu)。網(wǎng)絡(luò)還在發(fā)展，我國應(yīng)已積極的姿態(tài)投入其中。

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