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IC697MDL740

IC697MDL740

I/O模塊

各I/O點(diǎn)的通/斷狀態(tài)用發(fā)光二極管（LED）顯示，PLC與外部接線的連接一般用接線端子，某些模塊使用可以拆卸的插座型端子板，不需斷開端子板上的連接線，就可以迅速的更換模塊。

輸入模塊：PLC通過輸入模塊來接收和采集輸入信號，通過輸出模塊控制接觸器、電磁閥、電磁鐵、調(diào)速裝置等執(zhí)行器，PLC控制的另一類外部負(fù)載是指示燈、數(shù)字顯示裝置和報警裝置等。輸入電路中設(shè)有RC濾波電路，以防止由于輸入觸點(diǎn)抖動或外部干擾脈沖引起的錯誤輸入信號。

輸出模塊：輸出模塊的率放大元件有大功率晶體管和場效應(yīng)管（驅(qū)動直流負(fù)載）、雙向可控硅（驅(qū)動交流負(fù)載）和小型繼電器，繼電器可以驅(qū)動交流負(fù)載或直流負(fù)載。輸出電流的典型值為0.5—2A,負(fù)載電源由外部現(xiàn)場提供。

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