C200H-AD003
C200H-AD003
從PLC控制系統與電器控制系統比較可知，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”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系，下面通過一個例子來說明。如圖1所示為三相異步電動機單向起動運行的電器控制系統。其中，由輸入設備SB1、SB2、FR的觸點構成系統的輸入部分，由輸出設備KM構成系統的輸出部分。
現貨，現貨，降降降，火火火，火火火……
現貨，現貨，降降降，火火火，火火火……
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◆ 企業名稱：廈門泰尼電氣有限公司
◆ ： 小廖（女士）
◆ ：
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◆ :
誠信經營，質量為首，服務*，廈門泰尼小廖竭誠為您服務！！！
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