ABB DSAO301 57120001-DZ/4?
ABB DSAO301 57120001-DZ/4?
ABB DSAO301 57120001-DZ/4?
：
從PLC控制系統(tǒng)與電器控制系統(tǒng)比較可知，PLC的用戶程序（軟件）代替了繼電器控制電路（硬件）。因此，對(duì)于使用者來說，可以將PLC等效成是許許多多各種各樣的“軟繼電器”和“軟接線”的集合，而用戶程序就是用“軟接線”將“軟繼電器”及其“觸點(diǎn)”按一定要求連接起來的“控制電路”。
為了更好的理解這種等效關(guān)系，下面通過一個(gè)例子來說明。如圖1所示為三相異步電動(dòng)機(jī)單向起動(dòng)運(yùn)行的電器控制系統(tǒng)。其中，由輸入設(shè)備SB1、SB2、FR的觸點(diǎn)構(gòu)成系統(tǒng)的輸入部分，由輸出設(shè)備KM構(gòu)成系統(tǒng)的輸出部分。
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廈門莫格電氣自動(dòng)化有限公司
：楊麗君（銷售工程師）
手 機(jī)：/
：3443643092
郵 箱：3443643092
傳 真：（請(qǐng)備注楊工收）
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