900A01-0102
900A01-0102
問] :
可編程序控制器(PLC)中的“輸出繼電器”與其“繼電器輸出”有何內(nèi)在?
[答] :
可編程序控制器(PLC)在采用梯形圖作為編程語言時,梯形圖中的“輸出繼電器”僅是一種形象化的“軟繼電器”,PLC通過它來起到輸出控制作用,當(dāng)其滿足接通條件時,對應(yīng)的輸出可即有輸出信號。實施輸出的硬件,則可能是能輸出開關(guān)量信息的三極管、雙向晶閘管。當(dāng)PLC采用繼電器輸出時,是以繼電器的觸點來執(zhí)行梯形圖中“輸出繼電器”的輸出指令。因此,并不是說PLC的“輸出繼電器”只能用繼電器輸出的模式。
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