進(jìn)入90年代后期，由于用戶對開放性的強(qiáng)烈要求和壓力，由于信息技術(shù)的大力推動(dòng)，PLC如果還停留在原有的專用而又封閉的系統(tǒng)概念上，它將坐以待斃。于是PLC進(jìn)入了其發(fā)展的第四階段。其特征是:
在保留PLC功能的前提下，采用面向現(xiàn)場總線網(wǎng)絡(luò)的體系結(jié)構(gòu)，采用開放的通信接口，如以太網(wǎng)、高速串口等。
采用各種相關(guān)的國際工業(yè)標(biāo)準(zhǔn)和一系列的事實(shí)上的標(biāo)準(zhǔn)。
值得注意的是PLC和DCS這些原來處于不同硬件平臺的系統(tǒng)，正隨著計(jì)算技術(shù)、通信技術(shù)和編程技術(shù)的發(fā)展，趨向于建立同一硬件平臺，運(yùn)用同一個(gè)操作系統(tǒng)、同一個(gè)編程系統(tǒng)，執(zhí)行不同的DCS和PLC功能。這就是真正意義上的EIC三電一體化。或者說DCS和PLC的形態(tài)將會(huì)變化，而它們的功能依然存在。其中的關(guān)鍵技術(shù)應(yīng)該是嵌入式PC系統(tǒng)及支持現(xiàn)場總線的I/O（硬件），以及以IEC 61161-3為基礎(chǔ)的編程系統(tǒng)及強(qiáng)實(shí)時(shí)(hard real-time)操作系統(tǒng)。
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