開放性。關(guān)于開放性,這個(gè)問題是制約dcs發(fā)展的一個(gè)很大的因素,由于dcs各廠家對(duì)于自己的網(wǎng)絡(luò)協(xié)議和系統(tǒng)軟件采取嚴(yán)格的保密措施,這就造成了如果別的廠家的plc或其它的控制設(shè)備就不可能很好的無縫的接入dcs控制系統(tǒng),往往需要經(jīng)過復(fù)雜的協(xié)議轉(zhuǎn)換,得到的通訊速率和通訊能力都很不理想,例如honeywell公司的tps系統(tǒng)和ab公司的plc5系列的plc進(jìn)行通訊就需要通過串口并加上雙方為通訊開發(fā)出來的輔助設(shè)備來實(shí)現(xiàn),但當(dāng)通訊量較大時(shí),其實(shí)時(shí)性就大大降低,這個(gè)問題就阻礙了dcs的應(yīng)用領(lǐng)域和競(jìng)爭(zhēng)力。目前一些dcs廠家已經(jīng)意識(shí)到該問題的嚴(yán)重性,目前honeywell公司主推的pks控制系統(tǒng)就采取了controlnet的通訊網(wǎng)絡(luò),
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