描述
1.電器控制系統(tǒng)的組成
通過第一章的學(xué)習(xí)可知,任何一個(gè)電器控制系統(tǒng),都是由輸入部分、輸出部分和控制部分組成,如圖1所示。
圖1電器控制系統(tǒng)的組成
其中輸入部分是由各種輸入設(shè)備,如按鈕、位置開關(guān)及傳感器等組成;控制部分是按照控制要求設(shè)計(jì)的,由若干繼電器及觸點(diǎn)構(gòu)成的具有一定邏輯功能的控制電路;輸出部分是由各種輸出設(shè)備,如接觸器、電磁閥、指示燈等執(zhí)行元件組成。電器控制系統(tǒng)是根據(jù)操作指令及被控對象發(fā)出的信號,由控制電路按規(guī)定的動作要求決定執(zhí)行什么動作或動作的順序,然后驅(qū)動輸出設(shè)備去實(shí)現(xiàn)各種操作。由于控制電路是采用硬接線將各種繼電器及觸點(diǎn)按一定的要求連接而成,所以接線復(fù)雜且故障點(diǎn)多,同時(shí)不易靈活改變。
2.PLC控制系統(tǒng)的組成
由PLC構(gòu)成的控制系統(tǒng)也是由輸入、輸出和控制三部分組成,如圖2所示。
圖2 PLC控制系統(tǒng)的組成
從圖中可以看出,PLC控制系統(tǒng)的輸入、輸出部分和電器控制系統(tǒng)的輸入、輸出部分基本相同,但控制部分是采用“可編程”的PLC,而不是實(shí)際的繼電器線路。因此,PLC控制系統(tǒng)可以方便地通過改變用戶程序,以實(shí)現(xiàn)各種控制功能,從根本上解決了電器控制系統(tǒng)控制電路難以改變的問題。同時(shí),PLC控制系統(tǒng)不僅能實(shí)現(xiàn)邏輯運(yùn)算,還具有數(shù)值運(yùn)算及過程控制等復(fù)雜的控制功能。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列
本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
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