PI-EX-ME-2NAM/COC-24VDC現(xiàn)貨
優(yōu)勢產(chǎn)品:
伺服電機(jī):MKD、MDD、MSK、MAC、MHD系列等、
驅(qū)動(dòng)器:DKC、HDS、TDM、TVD、KDA、TDA系列等
變頻器:FB、FV、FE、EFC3600系列等、
驅(qū)動(dòng)板卡:DSS、DSM、DAA、DEA、VCM2、CLC、VT系列等
擰緊機(jī)模塊:KE300、KE312、SE301、SE311、LT304、VE300系列等
操作面板:CTA10、VCP20、BTV04、BTM、VAM系列等
存儲(chǔ)卡ink2">ink1">:HSM01.1-FW、FWC系列、固化軟件FWA-ECODR系列等
2、從系統(tǒng)結(jié)構(gòu)來說:
PLC與DCS的基本結(jié)構(gòu)是一樣的。PLC發(fā)展到今天,已經(jīng)全面移植到計(jì)算機(jī)系統(tǒng)控制上了,傳統(tǒng)的編程器早就被淘汰。小型應(yīng)用的PLC一般使用觸摸屏,大規(guī)模應(yīng)用的PLC全面使用計(jì)算機(jī)系統(tǒng)。和DCS一樣,控制器與IO站使用現(xiàn)場總線(一般都是基于RS485或RS232異步串口通訊協(xié)議的總線方式),控制器與計(jì)算機(jī)之間如果沒有擴(kuò)展的要求,也就是說只使用一臺(tái)計(jì)算機(jī)的情況下,也會(huì)使用這個(gè)總線通訊。但如果有不止一臺(tái)的計(jì)算機(jī)使用,系統(tǒng)結(jié)構(gòu)就會(huì)和DCS一樣,上位機(jī)平臺(tái)使用以太網(wǎng)結(jié)構(gòu)。這是PLC大型化后和DCS概念模糊的原因之一。
3、PLC和DCS的發(fā)展方向:
小型化的PLC將向更專業(yè)化的使用角度發(fā)展,比如功能更加有針對(duì)性、對(duì)應(yīng)用的環(huán)境更有針對(duì)性等等。大型的PLC與DCS的界線逐步淡化,直至完全融和。
DCS將向FCS的方向繼續(xù)發(fā)展。FCS的核心除了控制系統(tǒng)更加分散化以外,特別重要的是儀表。FCS在國外的應(yīng)用已經(jīng)發(fā)展到儀表級(jí)??刂葡到y(tǒng)需要處理的只是信號(hào)采集和提供人機(jī)界面以及邏輯控制,整個(gè)模擬量的控制分散到現(xiàn)場儀表,儀表與控制系統(tǒng)之間無需傳統(tǒng)電纜連接,使用現(xiàn)場總線連接整個(gè)儀表系統(tǒng)。(目前國內(nèi)有橫河在中海殼牌石化項(xiàng)目中用到了FCS,儀表級(jí)采用的是智能化儀表例如:EJX等,具備先進(jìn)的控制水準(zhǔn))。
○如何正確對(duì)待PLC和DCS
我個(gè)人從不強(qiáng)調(diào)PLC和DCS之間孰優(yōu)孰劣,我把它們使用了一個(gè)新名詞“控制類產(chǎn)品”。我們提供給用戶的是適合用戶的控制系統(tǒng)。絕大多數(shù)用戶不會(huì)因?yàn)橄胧褂靡惶譊CS而去使用DCS,控制類產(chǎn)品必須定位在滿足用戶的工藝要求的基礎(chǔ)之上。其實(shí)提出使用DCS還是PLC的用戶大抵是從沒接觸過自控產(chǎn)品或有某種特殊需求的。過分強(qiáng)調(diào)這個(gè)東東只會(huì)陷入口舌之爭。
從PLC與DCS之間的區(qū)別和共同之處我們了解了控制類產(chǎn)品的大抵情況。注意,作為專業(yè)人士,我們自己不要為產(chǎn)品下PLC還是DCS的定義,自己的心理上更不能把產(chǎn)品這樣來區(qū)別對(duì)待。
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NEW APC SMART-UPS SC 450VA SC450RM1U 1U RACKMOUNT/TOWE?R
ABB DRIVES PCB ASSY, AUX POWER CARD, SAFT 166 APC, 58096652 AB 891011 (BIN 61)
APC CAT-6 Data Distribution Cable - 50 feet DDCC6-050
APC NetBotz Camera Pod 120, NBPD0121 ~STSI
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APC SMT750 SMART-UPS SYSTEM (750VA USB & SERIAL 120V)
APC Replacement Battery Cartridge #24 -RBC24
PI-EX-ME-2NAM/COC-24VDC
Alfa Laval Purifier FOPX 609
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ALFA LAVAL Heat Exchange
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ALFA-LAVAL CBH25-50H (F1, F1) BRAZED PLATE HEAT EXCHANGER ~NEW~
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PI-EX-ME-2NAM/COC-24VDC
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