ABB  3BHE025034R6073  模塊  驅(qū)動(dòng)模塊

ABB  3BHE025034R6073  模塊  驅(qū)動(dòng)模塊

ABB  3BHE025034R6073  模塊  驅(qū)動(dòng)模塊

CPU模塊 

 CPU模塊主要由微處理器（CPU芯片）和存儲(chǔ)器組成。在PLC控制系統(tǒng)中，工廠CPU模塊相當(dāng)于人腦。它持續(xù)收集輸入信號(hào)，執(zhí)行用戶程序，并刷新系統(tǒng)的輸出；內(nèi)存用于存儲(chǔ)程序和數(shù)據(jù)。 

 2.I/O模塊 

 輸入模塊和輸出模塊簡(jiǎn)稱為I/O模塊。它們是系統(tǒng)的眼睛、耳朵、手和腳，是外部現(xiàn)場(chǎng)設(shè)備和CPU模塊之間的橋梁。 

 輸入模塊用于接收和采集輸入信號(hào)，開關(guān)輸入模塊用于接受從按鈕；來(lái)自選擇器開關(guān)、數(shù)字撥盤開關(guān)、限位開關(guān)、接近開關(guān)、光電開關(guān)、壓力繼電器等的開關(guān)輸入信號(hào)；模擬輸入模塊用于接收電位計(jì)、測(cè)速發(fā)電機(jī)和各種變送器提供的連續(xù)變化的模擬電流和電壓信號(hào)。 

 開關(guān)輸出模塊用于控制接觸器、電磁閥、電磁鐵、指示燈、數(shù)字顯示裝置和報(bào)警裝置等輸出設(shè)備，而模擬輸出模塊則用于控制調(diào)節(jié)閥和變頻器等執(zhí)行機(jī)構(gòu)。 

 CPU模塊的工作電壓一般為5V，而PLC的輸入/輸出信號(hào)電壓一般較高，如DC 24V和AC 220V。從外部引入的尖峰電壓和干擾噪聲可能會(huì)損壞CPU模塊中的組件或使PLC無(wú)法正常工作。在I/O模塊中，使用光耦合器、光電晶閘管、小繼電器等器件來(lái)隔離PLC的內(nèi)部電路和外部I/O電路。除了傳輸信號(hào)外，I/O模塊還具有電平轉(zhuǎn)換和隔離功能。

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