PLC的快速信號在慢速反應的DCS的操作站上顯示。經測定,一個微動開關的動作要經過幾秒以上的時間才能在DCS的操作站上表現出來。有的DCS甚至需要8秒。另一個互聯辦法是把PLC的個別信號用硬線連到DCS的輸入板上,這樣輸入的點數很少,成本比較高。有的DCS在DCS網絡上設計一個結點,該結點專門用來讀取PLC的信號。把PLC的信號送入DCS的網絡是比較困難的。缺點是開發接口的費用很高。即使開發成功,接口也經常發生故障。
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