1771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM717
DCS是計(jì)算機(jī)技術(shù)、控制技術(shù)和網(wǎng)絡(luò)技術(shù)高度結(jié)合的產(chǎn)物,是目前*先進(jìn)、*合理的過(guò)程控制系統(tǒng),可以適應(yīng)各種過(guò)程控制的要求。它的過(guò)程控制點(diǎn)分散,系統(tǒng)具有很高的可靠性。它通過(guò)集中的操作和監(jiān)控,DCS具有方便的操作和維護(hù)性能。DCS具有標(biāo)準(zhǔn)的接口,對(duì)外連接更加方便簡(jiǎn)捷。DCS的主要特點(diǎn)歸結(jié)為一句話就是“分散控制,集中管理”。
DCS是怎么發(fā)展出來(lái)的?
DCS是在集中式控制系統(tǒng)的基礎(chǔ)上發(fā)展、演變而來(lái)。它是一個(gè)由過(guò)程控制級(jí)和過(guò)程監(jiān)控級(jí)組成的以通信網(wǎng)絡(luò)為紐帶的多級(jí)計(jì)算機(jī)系統(tǒng),綜合了計(jì)算機(jī),通信、顯示和控制等4C技術(shù)。隨著
自動(dòng)化水平不斷提高,DCS發(fā)展至今已相當(dāng)成熟和實(shí)用,是當(dāng)前工業(yè)自動(dòng)化系統(tǒng)應(yīng)用及選型的主流。
回顧DCS的發(fā)展之路,各個(gè)技術(shù)階段的劃分很重要的一點(diǎn)就是依仗微處理器的位數(shù)增加,有人甚至提出微處理器更新?lián)Q代一次,DCS技術(shù)就會(huì)升一級(jí)。DCS通常采用若干個(gè)控制器(過(guò)程站)對(duì)一個(gè)生產(chǎn)過(guò)程中的眾多控制點(diǎn)進(jìn)行控制,各控制器間通過(guò)網(wǎng)絡(luò)連接并可進(jìn)行數(shù)據(jù)交換。采用計(jì)算機(jī)操作站,通過(guò)網(wǎng)絡(luò)與控制器連接,收集生產(chǎn)數(shù)據(jù),傳達(dá)操作指令。因此,DCS技術(shù)必然隨著微處理器的技術(shù)不斷更新?lián)Q代以順應(yīng)新系統(tǒng)的需要。
DCS未來(lái)將沿著以下趨勢(shì)繼續(xù)發(fā)展:
(1) 向綜合方向發(fā)展:標(biāo)準(zhǔn)化數(shù)據(jù)通信鏈路和通信網(wǎng)絡(luò)的發(fā)展,將各種單(多)回路調(diào)節(jié)器、PLC、工業(yè)PC、NC等工控設(shè)備構(gòu)成大系統(tǒng),以滿(mǎn)足工廠自動(dòng)化要求,并適應(yīng)開(kāi)放式的大趨勢(shì)。
(2) 向智能化方向發(fā)展:數(shù)據(jù)庫(kù)系統(tǒng)、推理機(jī)能等的發(fā)展,尤其是知識(shí)庫(kù)系統(tǒng)(KBS)和專(zhuān)家系統(tǒng)(ES)的應(yīng)用,如自學(xué)習(xí)控制、遠(yuǎn)距離診斷、自尋優(yōu)等,人工智能會(huì)在DCS各級(jí)實(shí)現(xiàn)。與FF現(xiàn)場(chǎng)總線類(lèi)似,以微處理器為基礎(chǔ)的智能設(shè)備如智能I/O、PID控制器、傳感器、變送器、執(zhí)行器、人機(jī)接口、PLC相繼出現(xiàn)。
(3) DCS工業(yè)PC化:由IPC組成DCS已成為一大趨勢(shì),PC作為DCS的操作站或節(jié)點(diǎn)機(jī)已很普遍,PC-PLC、PC-STD、PC-NC等就是PC-DCS先驅(qū),IPC成為DCS的硬件平臺(tái)。
(4) DCS專(zhuān)業(yè)化:DCS為更適合各相應(yīng)領(lǐng)域的應(yīng)用,就要進(jìn)一步了解相應(yīng)專(zhuān)業(yè)的工藝和應(yīng)用要求,以逐步形成如核電DCS,變電站DCS、玻璃DCS、水泥DCS等。
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