描述
DCS一般都提供統(tǒng)一的數(shù)據(jù)庫。換句話說，在DCS系統(tǒng)中一旦一個數(shù)據(jù)存在于數(shù)據(jù)庫中，就可在任何情況下引用，比如在組態(tài)軟件中，在監(jiān)控軟件中，在趨勢圖中，在報表中……而PLC系統(tǒng)的數(shù)據(jù)庫通常都不是統(tǒng)一的，組態(tài)軟件和監(jiān)控軟件甚至歸檔軟件都有自己的數(shù)據(jù)庫。為什么常說西門子的S7 400要到了414以上才稱為DCS？因為西門子的PCS7系統(tǒng)才使用統(tǒng)一的數(shù)據(jù)庫，而PCS7要求控制器起碼到S7 414-3以上的型號。
從時間調度上來說。
PLC的程序一般不能按事先設定的循環(huán)周期運行。PLC程序是從頭到尾執(zhí)行一次后又從頭開始執(zhí)行。（現(xiàn)在一些新型PLC有所改進，不過對任務周期的數(shù)量還是有限制）而DCS可以設定任務周期。比如，快速任務等。同樣是傳感器的采樣，壓力傳感器的變化時間很短，我們可以用200ms的任務周期采樣，而溫度傳感器的滯后時間很大，我們可以用2s的任務周期采樣。這樣，DCS可以合理的調度控制器的資源。
從網絡結構發(fā)面來說。
一般來講，DCS慣常使用兩層網絡結構，一層為過程級網絡，大部分DCS使用自己的總線協(xié)議，比如西門子和ABB的Profibus、ABB的CAN bus、施耐德的Modbus等，這些協(xié)議均建立在標準串口傳輸協(xié)議RS232或RS485協(xié)議的基礎上?，F(xiàn)場IO模塊，特別是模擬量的采樣數(shù)據(jù)（機器代碼，213/掃描周期）十分龐大，同時現(xiàn)場干擾因素較多，因此應該采用數(shù)據(jù)吞吐量大、抗干擾能力強的網絡標準?；赗S485串口異步通訊方式的總線結構，符合現(xiàn)場通訊的要求。
IO的采樣數(shù)據(jù)經CPU轉換后變?yōu)檎螖?shù)據(jù)或實形數(shù)據(jù)，在操作級網絡（第二層網絡）上傳輸。因此操作級網絡可以采用數(shù)據(jù)吞吐量適中、傳輸速度快、連接方便的網絡標準，同時因操作級網絡一般布置在控制室內，對抗干擾的要求相對較低。因此采用標準以太網是最佳選擇。TCP/IP協(xié)議是一種標準以太網協(xié)議，一般我們采用100Mbit/s的通訊速度。
PLC系統(tǒng)的工作任務相對簡單，因此需要傳輸?shù)臄?shù)據(jù)量一般不會太大，所以常見的PLC系統(tǒng)為一層網絡結構。過程級網絡和操作級網絡要么合并在一起，要不過程級網絡簡化成模件之間的內部連接。PLC不會或很少使用以太網。
產品承諾
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