描述

2711P-RN15SB

FCS系統(tǒng)的基礎是數(shù)字智能現(xiàn)場裝置
數(shù)字智能現(xiàn)場裝置是FCS系統(tǒng)的硬件支撐，是基礎，道理很簡單，F(xiàn)CS系統(tǒng)執(zhí)行的是自動控制裝置與現(xiàn)場裝置之間的雙向數(shù)字通信現(xiàn)場總線信號制。如果現(xiàn)場裝置不遵循統(tǒng)一的總線協(xié)議，即相關的通訊規(guī)約，不具備數(shù)字通信功能，那么所謂雙向數(shù)字通信只是一句空話，也不能稱之為現(xiàn)場總線控制系統(tǒng)。再一點，現(xiàn)場總線的一大特點就是要增加現(xiàn)場一級控制功能。如果現(xiàn)場裝置不是多功能智能化的產(chǎn)品，那么現(xiàn)場總線控制系統(tǒng)的特點也就不存在了，所謂簡化系統(tǒng)、方便設計、利于維護等優(yōu)越性也是虛的。
(3) FCS系統(tǒng)的本質(zhì)是信息處理現(xiàn)場化
對于一個控制系統(tǒng)，無論是采用DCS還是采用現(xiàn)場總線，系統(tǒng)需要處理的信息量至少是一樣多的。實際上，采用現(xiàn)場總線后，可以從現(xiàn)場得到更多的信息。現(xiàn)場總線系統(tǒng)的信息量沒有減少，甚至增加了，而傳輸信息的線纜卻大大減少了。這就要求一方面要大大提高線纜傳輸信息的能力，另一方面要讓大量信息在現(xiàn)場就地完成處理，減少現(xiàn)場與控制機房之間的信息往返?？梢哉f現(xiàn)場總線的本質(zhì)就是信息處理的現(xiàn)場化。
減少信息往返是網(wǎng)絡設計和系統(tǒng)組態(tài)的一條重要原則。減少信息往返常?？蓭砀纳葡到y(tǒng)響應時間的好處。因此，網(wǎng)絡設計時應優(yōu)先將相互間信息交換量大的節(jié)點，放在同一條支路里。
減少信息往返與減少系統(tǒng)的線纜有時會相互矛盾。這時仍應以節(jié)省投資為原則來做選擇。如果所選擇系統(tǒng)的響應時間允許的話，應選節(jié)省線纜的方案。如所選系統(tǒng)的響應時間比較緊張，稍微減少一點信息的傳輸就夠用了，那就應選減少信息傳輸?shù)姆桨浮?br /> 現(xiàn)在一些帶現(xiàn)場總線的現(xiàn)場儀表本身裝了許多功能塊，雖然不同產(chǎn)品同種功能塊在性能上會稍有差別，但一個網(wǎng)絡支路上有許多功能雷同功能塊的情況是客觀存在的。選用哪一個現(xiàn)場儀表上的功能塊，是系統(tǒng)組態(tài)要解決的問題。
考慮這個問題的原則是：盡量減少總線上的信息往返。一般可以選擇與該功能有關的信息輸出最多的那臺儀表上的功能塊。

產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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