輸出接口電路向被控對(duì)象的各種執(zhí)行元件輸出控制信號(hào)。常用執(zhí)行元件有接觸器、電磁閥、調(diào)節(jié)閥(模擬量)、調(diào)速裝置(模擬量)、指示燈、數(shù)字顯示裝置和報(bào)警裝置等。輸出接口電路一般由微電腦輸出接口電路和功率放大電路組成，與輸入接口電路類似，內(nèi)部電路與輸出接口電路之間采用光電耦合器進(jìn)行抗干擾電隔離。
 
微電腦輸出接口電路一般由輸出數(shù)據(jù)寄存器、選通電路和中斷請(qǐng)求邏輯電路集成在芯片上，CPU通過(guò)數(shù)據(jù)總線將輸出信號(hào)送到輸出數(shù)據(jù)寄存器中，功率放大電路是為了適應(yīng)工業(yè)控制要求，將微電腦的輸出信號(hào)放大。


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