詳細(xì)內(nèi)容：849-ZOD1247 1、 DCS是一種“分散式控制系統(tǒng)”，而PLC (可編程控制器) 只是一種控制“裝置”，兩者是“系統(tǒng)”與“裝置”的區(qū)別。系統(tǒng)可以實(shí)現(xiàn)任何裝置的功能與協(xié)調(diào)，PLC裝置只實(shí)現(xiàn)本單元所具備的功能。 2、 在網(wǎng)絡(luò)方面，DCS網(wǎng)絡(luò)是整個系統(tǒng)的中樞神經(jīng)，它是安全可靠雙冗余的高速通訊網(wǎng)絡(luò)，系統(tǒng)的拓展性與開放性更好。而PLC因為基本上都為個體工作，其在與別的PLC或上位機(jī)進(jìn)行通訊時，所采用的網(wǎng)絡(luò)形式基本都是單網(wǎng)結(jié)構(gòu)，網(wǎng)絡(luò)協(xié)議也經(jīng)常與國際標(biāo)準(zhǔn)不符。在網(wǎng)絡(luò)安全上，PLC沒有很好的保護(hù)措施，我們采用電源、CPU、網(wǎng)絡(luò)雙冗余。 3、 DCS整體考慮方案，操作員站都具備工程師站功能，站與站之間在運(yùn)行方案程序下裝后是一種緊密聯(lián)合的關(guān)系，任何站、任何功能、任何被控裝置間都是相互連鎖控制，協(xié)調(diào)控制；而單用PLC互相連接構(gòu)成的系統(tǒng)，其站與站(PLC與PLC)之間的聯(lián)系則是一種松散連接方式，是做不出協(xié)調(diào)控制的功能。 4、 DCS在整個設(shè)計上就留有大量的可擴(kuò)展性接口，外接系統(tǒng)或擴(kuò)展系統(tǒng)都十分方便，PLC所搭接的整個系統(tǒng)完成后，想隨意的增加或減少操作員站都是很難實(shí)現(xiàn)的。 5、 DCS安全性：為保證DCS控制的設(shè)備的安全可靠，DCS采用了雙冗余的控制單元，當(dāng)重要控制單元出現(xiàn)故障時，都會有相關(guān)的冗余單元實(shí)時無擾的切換為工作單元，保證整個系統(tǒng)的安全可靠。PLC所搭接的系統(tǒng)基本沒有冗余的概念，就更談不上冗余控制策略。特別是當(dāng)其某個PLC單元發(fā)生故障時，不得不將整個系統(tǒng)停下來，才能進(jìn)行更換維護(hù)并需重新編程。所以DCS系統(tǒng)要比PLC安全可靠性上高一個等級。 6、 系統(tǒng)軟件，對各種工藝控制方案更新是DCS的一項最基本的功能，當(dāng)某個方案發(fā)生變化后，工程師只需要在工程師站上將更改過的方案編譯后，執(zhí)行下裝命令就可以了，下裝過程是由系統(tǒng)自動完成的，不影響原控制方案運(yùn)行。系統(tǒng)各種控制軟件與算法可以將工藝要求控制對象控制精度提高。而對于PLC構(gòu)成的系統(tǒng)來說，工作量極其龐大，首先需要確定所要編輯更新的是哪個PLC，然后要用與之對應(yīng)的編譯器進(jìn)行程序編譯，最后再用專用的機(jī)器(讀寫器)專門一對一的將程序傳送給這個PLC，在系統(tǒng)調(diào)試期間，大量增加調(diào)試時間和調(diào)試成本，而且極其不利于日后的維護(hù)。在控制精度上相差甚遠(yuǎn)。這就決定了為什么在大中型控制項目中(500點(diǎn)以上)，基本不采用全部由PLC所連接而成的系統(tǒng)的原因。 7、 模塊：DCS系統(tǒng)所有I/O模塊都帶有CPU，可以實(shí)現(xiàn)對采集及輸出信號品質(zhì)判斷與標(biāo)量變換，故障帶電插拔，隨機(jī)更換。而PLC模塊只是簡單電氣轉(zhuǎn)換單元，沒有智能芯片，故障后相應(yīng)單元全部癱瘓。 8、現(xiàn)在高端的PLC與DCS的功能已經(jīng)差不多，DCS對網(wǎng)絡(luò)和分布式數(shù)據(jù)庫還要定時掃描有較強(qiáng)的功能，同時對運(yùn)算和模擬量的處量比較拿手。 9、PLC還分大、中、小、微PLC，其中微型的只賣幾百塊到2000塊，點(diǎn)數(shù)也好少，大型的可以帶數(shù)千點(diǎn)，運(yùn)算能力與DCS差不多，但對多機(jī)聯(lián)網(wǎng)功能較弱。現(xiàn)在兩個技術(shù)平臺都差不多，只是重點(diǎn)不一樣。 ALLEN-BRADLEY SLC 500 SLC 5/05 CPU PROCESSOR 1747-L553 SERIES C FRN. 10 ALLEN BRADLEY DNC/INTERFACE MODULE RS-232C 7300-UCT-2 ,635290 REV 5 BX Siemens R1-106-100-522 Servo Motor Allen Bradley MPL-B430P-SK22AA MPLB430PSK22AA Servo Motor Allen Bradley MPL-B420P-SK22AA MPLB420PSK22AA Perfect Touchscreen. 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Allen Bradley 1756-EN2F /B ControlLogix EtherNet/IP Bridge * 2014* Allen Bradley 1769-L30ER /A CompactLogix EtherNet Processor WARRANTY * 2012* Allen Bradley 1756-EN2TR /B High Capacity Ethernet/IP Module WARRANTY *FACTORY SEALED* Allen Bradley 1791-0A16/ Series B Mfg Date:2008 *Free Shipping* *2013 SEALED* Allen Bradley 1756-M16SE FW15.37 ControlLogix SERCOS 16 axis