在40年代，過程控制是基于3～15PSI的氣動標(biāo)準(zhǔn)信號。其后，由于4～20mA模擬信號的使用，使得模擬控制器得到了廣泛應(yīng)用，但是并不是所有的傳感儀表和驅(qū)動裝置都使用統(tǒng)一的4～20mA信號。70年代，由于在檢測、模擬控制和邏輯控制領(lǐng)域率先使用了計算機，從而產(chǎn)生了集中控制。進入80年代，由于微處理器的出現(xiàn)，促使工業(yè)儀表進入了數(shù)字化和智能化的時代，4～20mA模擬信號傳輸逐步被數(shù)字化通信代替，加之分布式控制以及網(wǎng)絡(luò)技術(shù)的迅速發(fā)展，促進了控制、調(diào)度、優(yōu)化、決策等功能一體化的發(fā)展。然而由于檢測、變送、執(zhí)行等機構(gòu)大都采用模擬信號連接，其傳送方式是一對一結(jié)構(gòu)，這使得接線復(fù)雜，工程費用高，維護困難，而信號傳輸精度底，易受干擾，儀表互換性差，這都阻礙了上層系統(tǒng)的功能發(fā)揮。另一方面，由于智能儀表的功能遠遠超過了現(xiàn)場模擬儀表，如對量程和零點進行遠方設(shè)定，儀表工作狀態(tài)實現(xiàn)自診斷，能進行多參數(shù)測量和對環(huán)境影響的補償?shù)?。由此可見，智能儀表和控制系統(tǒng)的發(fā)展，都要求上層
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