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1203-CN1

1203-CN1

1203-CN1

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。

圖1 三相異步電動機單向運行電器控制系統

a）主電路         b）控制電路

  如果用PLC來控制這臺三相異步電動機，組成一個PLC控制系統，根據上述分析可知，系統主電路不變，只要將輸入設備SB1、SB2、FR的觸點與PLC的輸入端連接，輸出設備KM線圈與PLC的輸出端連接，就構成PLC控制系統的輸入、輸出硬件線路。而控制部分的功能則由PLC的用戶程序來實現，其等效電路如圖2所示。

圖2  PLC的等效電路

 圖中，輸入設備SB1、SB2、FR與PLC內部的“軟繼電器”X0、X1、X2的“線圈”對應，由輸入設備控制相對應的“軟繼電器”的狀態，即通過這些“軟繼電器”將外部輸入設備狀態變成PLC內部的狀態，這類“軟繼電器”稱為輸入繼電器；同理，輸出設備KM與PLC內部的“軟繼電器”Y0對應，由“軟繼電器”Y0狀態控制對應的輸出設備KM的狀態，即通過這些“軟繼電器”將PLC內部狀態輸出，以控制外部輸出設備，這類“軟繼電器”稱為輸出繼電器。

因此，PLC用戶程序要實現的是：如何用輸入繼電器X0、X1、X2來控制輸出繼電器Y0。當控制要求復雜時，程序中還要采用PLC內部的其它類型的“軟繼電器”，如輔助繼電器、定時器、計數器等，以達到控制要求。

要注意的是，PLC等效電路中的繼電器并不是實際的物理繼電器，它實質上是存儲器單元的狀態。單元狀態為“１”，相當于繼電器接通；單元狀態為“０”，則相當于繼電器斷開。因此，我們稱這些繼電器為“軟繼電器”。

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