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PLC主要由CPU模塊、輸入模塊、輸出模塊和編程器組成(見(jiàn)圖1），有的PLC還可以配備特殊功能模塊，用來(lái)完成某些特殊的任務(wù)。
1．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)中廠CPU模塊相當(dāng)于人的大腦，它不斷地采集輸入信號(hào)，執(zhí)行用戶程序，刷新系統(tǒng)的輸出；存儲(chǔ)器用來(lái)儲(chǔ)存程序和數(shù)據(jù)。
2.I/O模塊
輸入(1nput)模塊和輸出(Output)模塊簡(jiǎn)稱為I／O模塊，它們是系統(tǒng)的眼、耳、手、腳，是聯(lián)系外部現(xiàn)場(chǎng)設(shè)備和CPU模塊的橋梁。
輸入模塊用來(lái)接收和采集輸入信號(hào)，開(kāi)關(guān)量輸入模塊用來(lái)接收從按鈕；選擇開(kāi)關(guān)、數(shù)字撥碼開(kāi)關(guān)、限位開(kāi)關(guān)、接近開(kāi)關(guān)、光電開(kāi)關(guān)、壓力繼電器等過(guò)來(lái)的開(kāi)關(guān)量輸入信號(hào)；模擬量輸入模塊用來(lái)接收電位器、測(cè)速發(fā)電機(jī)和各種變送器提供的連續(xù)變化的模擬量電流、電壓信號(hào)。
開(kāi)關(guān)量輸出模塊用來(lái)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，模擬量輸出模塊月手來(lái)控制調(diào)節(jié)閥、變頻器等執(zhí)行裝置。
圖1 PLC控制系統(tǒng)示意圖
CPU模塊的工作電壓一般是5V，而PLC的輸入／輸出信號(hào)電壓一般較高，如直流24V和交流220V。從外部引入的尖峰電壓和干擾噪聲可能損壞CPU模塊中的元器件，或使PLC不能正常工作。在I／O模塊中，用光耦合器、光電晶閘管、小型繼電器等器件來(lái)隔離PLC的內(nèi)部電路和外部的I／O電路，I／O模塊除了傳遞信號(hào)外，還有電平轉(zhuǎn)換與隔離的作用。
3．編程器
編程器用來(lái)生成用戶程序，并用它進(jìn)行編輯、檢查、修改和監(jiān)視用戶程序的執(zhí)行情況。手持式編程器不能直接輸入和編輯梯形圖，只能輸入和編輯指令表程序，因此又叫做指令編程器。它的體積小，價(jià)格便宜，一般用來(lái)給小型PLC編程，或者用于現(xiàn)場(chǎng)調(diào)試和維護(hù)。
使用編程軟件可以在計(jì)算機(jī)的屏幕上直接生成和編輯梯形圖、指令表、功能塊圖和順序功能圖程序，并可以實(shí)現(xiàn)不同編程語(yǔ)言的相互轉(zhuǎn)換。程序被編譯后下載到PLC，也可以將PLC中的程序上傳到計(jì)算機(jī)。程序可以存盤或打印，通過(guò)網(wǎng)絡(luò)，還可以實(shí)現(xiàn)遠(yuǎn)程編程和傳送。
4．電源
PLC一般使用220V交流電源或24V直流電源。內(nèi)部的開(kāi)關(guān)電源為各模塊提供DC 5V，±12V，24V等直流電源。小型PLC一般都可以為輸入電路和外部的電子傳感器(如接近開(kāi)關(guān))提供24V直流電源，驅(qū)動(dòng)PLC負(fù)載的直流電源一般由用戶提供。
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FBM203c P0922UD 8通道0-30熱電阻輸入接口組件
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FBM214 P0914XN 8通道熱電阻輸入接口組件 FBM214模塊
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FBM237 P0914XS 冗余8通道0-20mA輸入接口組件
FBM241 P0914TG 8通道電壓監(jiān)視輸入,8通道離散量輸出(外部源)
FBM241b P0914WK 8通道電壓監(jiān)視輸入,8通道離散量輸出(內(nèi)部源)
FBM214c P0914WM 8通道觸點(diǎn)輸入，8通道離散量輸出（外部源）組件
FBM214d P0914WP 8通道觸點(diǎn)輸入，8通道離散量輸出（內(nèi)部源）組件
FBM240 P0917GZ 冗余輸出接口組件
FBM242 P0916TA 16通道離散量輸出（外部源）接口組件（可選冗余）
FBM243 P0914TK 8通道雙向FoxCom雙波特率智能設(shè)備接口組件
FBM246 P0914XN 冗余8通道雙向FoxCom雙波特率智能設(shè)備組件 2、 現(xiàn)場(chǎng)總線通訊組件
FCM10E P0914YM (將10Mbps的以太網(wǎng)信號(hào)轉(zhuǎn)換為2 Mbps信號(hào)，用于D型導(dǎo)軌安裝式現(xiàn)場(chǎng)總線組件（成對(duì)冗余現(xiàn)場(chǎng)總線使用）
FCM10EF P0916CD (將10Mbps的光纖信號(hào)轉(zhuǎn)換為2 Mbps信號(hào)，用于D型導(dǎo)軌安裝式現(xiàn)場(chǎng)總線組件（成對(duì)冗余使用）
P0904AP
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