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(kāi)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(guò)輸入模塊來(lái)接收和采集輸入信號(hào)，通過(guò)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(bào)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(dòng)或外部干擾脈沖引起的錯(cuò)誤輸入信號(hào)。
輸出模塊：輸出模塊的率放大元件有大功率晶體管和場(chǎng)效應(yīng)管（驅(qū)動(dòng)直流負(fù)載）、雙向可控硅（驅(qū)動(dòng)交流負(fù)載）和小型繼電器，繼電器可以驅(qū)動(dòng)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(chǎng)提供。
聯(lián)系人：黃生(銷售工程師)
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