描述
危險究竟要分散到多少算合適呢？這與當(dāng)時的計算機(jī)技術(shù)的發(fā)展水平有關(guān)。70年代中期，徹底分散就是一個控制器完成一個回路的運(yùn)算。當(dāng)時由于人們對數(shù)字技術(shù)不太熟息，習(xí)慣于模擬儀表，70年代末、80年代曾經(jīng)風(fēng)行回路控制器，把數(shù)字控制器做成和原來模擬儀表在外觀上幾乎完全一樣，不改變操作習(xí)慣，內(nèi)部把PID運(yùn)算數(shù)字化。一塊儀表（一臺計算機(jī)）完成一個回路的控制任務(wù)。其價格較為昂貴，但危險是分散了。然后用通訊網(wǎng)絡(luò)把各個控制器和以CRT為基礎(chǔ)的人機(jī)界面連成一個系統(tǒng)。這時網(wǎng)絡(luò)結(jié)構(gòu)通常都是星形結(jié)構(gòu)?；芈返目刂破鞯闹谱鞒杀咎?，價格/性能比不好。后來為了減低成本，就有兩回路的、四回路的控制器，它的價格/性能比稍好一些。對于一個大中型系統(tǒng)來說，DCS的價格/性能比比回路控制器組成的系統(tǒng)要好。有些特殊地方還是要用到一些回路控制器。
如果所要完成的回路太多，如一個控制器采集幾千點(diǎn)、完成幾百個回路的運(yùn)算，危險又太集中。在這種情況下，危險必需分散。隨著計算機(jī)技術(shù)的發(fā)展，計算機(jī)的運(yùn)算能力、存儲容量和可靠性不斷提高，一臺計算機(jī)所完成的任務(wù)也可以增加。完成的任務(wù)也可集中一點(diǎn)。另外，控制器、網(wǎng)絡(luò)等冗余技術(shù)也得到了發(fā)展，控制運(yùn)算也可集中一些。
從目前的DCS來看，一個控制器完成幾十個回路的運(yùn)算和幾百點(diǎn)的采集、再加適量的邏輯運(yùn)算，經(jīng)現(xiàn)場使用，效果是比較好的。這就產(chǎn)生控制器升級的問題了。有時控制器和檢測元件的距離還是比較遠(yuǎn)，這就促進(jìn)現(xiàn)場總線的發(fā)展。如CAN、LOONWORKS、FF等現(xiàn)場總線，以及HART協(xié)議接收板等都用到DCS系統(tǒng)中。
DCS分為三大部分，帶I/O板的控制器、通訊網(wǎng)絡(luò)和人機(jī)界面（hmi）。由I/O板通過端子板直接與生產(chǎn)過程相連，讀取傳感器來的信號。I/O板有幾種不同的類型，每一種I/O板都有相應(yīng)的端子板。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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