140DDO84300
PLC運(yùn)行時CPU從輸入映像寄存器讀取輸入信息并進(jìn)行處理,將處理結(jié)果放到輸出映像寄存器。輸出映像寄存器由輸出點(diǎn)相對應(yīng)的觸發(fā)器組成,輸出接口電路將其由弱電控制信號轉(zhuǎn)換成現(xiàn)場需要的強(qiáng)電信號輸出,以驅(qū)動電磁閥、接觸器、指示燈等被控設(shè)備的執(zhí)行元件。
輸出接口電路通常有三種類型:繼電器輸出型、晶體管輸出型和晶閘管輸出則。每種輸出電路都采用電氣隔離技術(shù),電源由外部提供,輸出電流一般為1.5—2A,輸出電流的額定值與負(fù)載的性質(zhì)有關(guān)。
為使PLC避免受瞬間大電流的作用而損壞,輸出端外部接線必須采用保護(hù)措施:一是輸出公共端接熔斷器;二是采用保護(hù)電路,對交流感件負(fù)載,一般用阻容吸收回路;對直流感性負(fù)載用續(xù)流二極管。極大部分的PLC的輸出端子采用分組式和分隔式。對于晶體管輸出型還有源型輸出和漏型輸出兩種形式。極大部分的歐美品牌的PLC采用源型輸出,而極大部分的亞洲品牌的PLC采用漏型輸出。
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