PLC數(shù)據(jù)通訊交換的問題,主要源于PLC長期以來做為一個獨立裝置在發(fā)展,沒有系統(tǒng)概念;而且主要應用在小型控制系統(tǒng)中,問題暴露得并不明顯,所以發(fā)展較慢。目前也有一些大型PLC在這個方面有所提高,但是要達到DCS的水平還需要一個相當長的過程。
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