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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(見圖1），有的PLC還可以配備特殊功能模塊，用來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，執(zhí)行用戶程序，刷新系統(tǒng)的輸出；存儲器用來儲存程序和數(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)場設(shè)備和CPU模塊的橋梁。
輸入模塊用來接收和采集輸入信號，開關(guān)量輸入模塊用來接收從按鈕；選擇開關(guān)、數(shù)字撥碼開關(guān)、限位開關(guān)、接近開關(guān)、光電開關(guān)、壓力繼電器等過來的開關(guān)量輸入信號；模擬量輸入模塊用來接收電位器、測速發(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。
開關(guān)量輸出模塊用來控制接觸器、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模塊除了傳遞信號外，還有電平轉(zhuǎn)換與隔離的作用。
3．編程器
編程器用來生成用戶程序，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，一般用來給小型PLC編程，或者用于現(xiàn)場調(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(如接近開關(guān))提供24V直流電源，驅(qū)動PLC負(fù)載的直流電源一般由用戶提供。
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FBM203b P0922UA 8通道0-640熱電阻輸入接口組件
FBM203c P0922UD 8通道0-30熱電阻輸入接口組件
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FBM213 P0914XL 14通道熱電偶輸入接口組件 FBM213模塊
FBM214 P0914XN 8通道熱電阻輸入接口組件 FBM214模塊
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FBM221 P0917HB 4通道H1 FOUNDATION 現(xiàn)場總線接口組件
FBM223 P0917HD 2通道PROFIBUS-DP 現(xiàn)場總線接口組件
FBM224 P0926GG 4口RS-232、RS-422或RS-485與Modbus組件
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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)場總線通訊組件
FCM10E P0914YM (將10Mbps的以太網(wǎng)信號轉(zhuǎn)換為2 Mbps信號，用于D型導(dǎo)軌安裝式現(xiàn)場總線組件（成對冗余現(xiàn)場總線使用）
FCM10EF P0916CD (將10Mbps的光纖信號轉(zhuǎn)換為2 Mbps信號，用于D型導(dǎo)軌安裝式現(xiàn)場總線組件（成對冗余使用）
P0904AP
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