特點(diǎn)
為何要獨(dú)立設(shè)置ESD系統(tǒng)呢？當(dāng)然一般安全聯(lián)鎖保護(hù)功能也可由DCS來實(shí)現(xiàn)。但是
對于較大規(guī)模的緊急停車系
統(tǒng)應(yīng)按照安全獨(dú)立原則與DCS分開設(shè)置，這樣做主要有以下幾方面原因：
（1）降低控制功能和安全功能同時(shí)失效的概率，當(dāng)維護(hù)DCS部分故障時(shí)也不會危
及安全保護(hù)系統(tǒng);
（2）對于大型裝置或旋轉(zhuǎn)機(jī)械設(shè)備而言，緊急停車系統(tǒng)響應(yīng)速度越快越好。這有
利于保護(hù)設(shè)備，避免事故擴(kuò)
大；并有利于分辨事故原因記錄。而DCS處理大量過程監(jiān)測信息，因此其響應(yīng)速度
難以作得很快；
（3）DCS系統(tǒng)是過程控制系統(tǒng)，是動態(tài)的，需要人工頻繁的干預(yù)，這有可能引起
人為誤動作；而ESD是靜態(tài)
的，不需要人為干預(yù)，這樣設(shè)置ESD可以避免人為誤動作。
其他含義
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