PLC的快速信號在慢速反應(yīng)的DCS的操作站上顯示。經(jīng)測定，一個微動開關(guān)的動作要經(jīng)過幾秒以上的時間才能在DCS的操作站上表現(xiàn)出來。有的DCS甚至需要8秒。另一個互聯(lián)辦法是把PLC的個別信號用硬線連到DCS的輸入板上，這樣輸入的點數(shù)很少，成本比較高。有的DCS在DCS網(wǎng)絡(luò)上設(shè)計一個結(jié)點，該結(jié)點專門用來讀取PLC的信號。把PLC的信號送入DCS的網(wǎng)絡(luò)是比較困難的。缺點是開發(fā)接口的費用很高。即使開發(fā)成功，接口也經(jīng)常發(fā)生故障。

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