1760-IB12XOW4IOF現貨
1.歐美原裝進口,品質保證可提供報關單及原廠證明
2.德國公司源頭采購,享受好低價切實節省采購成本
3.攜手物流服務商,確保貨期準確和降低貨物耗損
4.嚴格執行廠家保修規定,與供應商合作確保貨物質量
5.專業服務,值得信賴,高素質員工,公司精細化管理
2、從系統結構來說:
PLC與DCS的基本結構是一樣的。PLC發展到今天,已經全面移植到計算機系統控制上了,傳統的編程器早就被淘汰。小型應用的PLC一般使用觸摸屏,大規模應用的PLC全面使用計算機系統。和DCS一樣,控制器與IO站使用現場總線(一般都是基于RS485或RS232異步串口通訊協議的總線方式),控制器與計算機之間如果沒有擴展的要求,也就是說只使用一臺計算機的情況下,也會使用這個總線通訊。但如果有不止一臺的計算機使用,系統結構就會和DCS一樣,上位機平臺使用以太網結構。這是PLC大型化后和DCS概念模糊的原因之一。
3、PLC和DCS的發展方向:
小型化的PLC將向更專業化的使用角度發展,比如功能更加有針對性、對應用的環境更有針對性等等。大型的PLC與DCS的界線逐步淡化,直至完全融和。
DCS將向FCS的方向繼續發展。FCS的核心除了控制系統更加分散化以外,特別重要的是儀表。FCS在國外的應用已經發展到儀表級。控制系統需要處理的只是信號采集和提供人機界面以及邏輯控制,整個模擬量的控制分散到現場儀表,儀表與控制系統之間無需傳統電纜連接,使用現場總線連接整個儀表系統。(目前國內有橫河在中海殼牌石化項目中用到了FCS,儀表級采用的是智能化儀表例如:EJX等,具備先進的控制水準)。
○如何正確對待PLC和DCS
我個人從不強調PLC和DCS之間孰優孰劣,我把它們使用了一個新名詞“控制類產品”。我們提供給用戶的是適合用戶的控制系統。絕大多數用戶不會因為想使用一套DCS而去使用DCS,控制類產品必須定位在滿足用戶的工藝要求的基礎之上。其實提出使用DCS還是PLC的用戶大抵是從沒接觸過自控產品或有某種特殊需求的。過分強調這個東東只會陷入口舌之爭。
從PLC與DCS之間的區別和共同之處我們了解了控制類產品的大抵情況。注意,作為專業人士,我們自己不要為產品下PLC還是DCS的定義,自己的心理上更不能把產品這樣來區別對待。
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1760-IB12XOW4IOF
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1760-IB12XOW4IOF
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1760-IB12XOW4IOF
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