PLC與繼電器接觸器控制系統(tǒng)的比較通過對鼠籠式異步電動機起制動的傳統(tǒng)控制方法和PLC控制方法的比較,從某種意義上看,PLC控制是從繼電器接觸器控制發(fā)展而來的。兩者既有相似性又有很多不同處。
1、 二種方案的不同點
(1)PLC內(nèi)部大部分采用“軟”邏輯
繼電器接觸器控制全部用硬器件、硬觸點和“硬”線連接,為全硬件控制;PLC內(nèi)部大部分采用“軟”電器、“軟”接點和“軟”線連接,為軟件控制;
(2) PLC控制系統(tǒng)結(jié)構(gòu)緊湊
繼電器接觸器控制系統(tǒng)使用電器多,體積大且故障率大;PLC控制系統(tǒng)結(jié)構(gòu)緊湊,使用電器少,體積小;
(3) PLC內(nèi)部全為“軟接點”動作快
電器接觸器控制全為機械式觸點,動作慢,弧光放電嚴(yán)重;PLC內(nèi)部全為“軟接點”動作快;
(4) PLC控制功能改變極其方便
繼電器接觸器控制功能改變,需拆線接線乃至更換元器件,比較麻煩;PLC控制功能改變,一般只需修改程序便可,極其方便;
(5) PLC控制系統(tǒng)制造周期短
PLC控制系統(tǒng)由于結(jié)構(gòu)簡單緊湊,基本為軟件控制,因此設(shè)計、施工與調(diào)試比繼電器接觸器控制系統(tǒng)周期短。
此外,由于PLC技術(shù)是計算機控制的基礎(chǔ)上發(fā)展而來,因此,它的軟硬件設(shè)置上有著傳統(tǒng)的繼電器接觸器控制無法比擬的優(yōu)勢,工作可靠性極高。
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