PLC的主要模塊構(gòu)成（系統(tǒng)組成圖）

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(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。   

輸入模塊用來接收和采集輸入信號(hào)，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(hào)；模擬量輸入模塊用來接收電位器、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(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(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(dòng)PLC負(fù)載的直流電源一般由用戶提供。

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KLA INSTRUMENTSINTE?RFACE 1 PHASE 3 BOARD,710-65808?6-20 C0

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HD SF14-50-180188, HARMONIC DRIVE SYSTEMS,GEAR,GE?ARHEAD,REDUCER,

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TEL PCB BOARD SIO-1 3281-000172-13,?3208-000172-13

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TEL TOKYO BOARD E2B101-16/MCP,E?208-000001-16,3?M80-001250-17,E?280-000001-27

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COGNEX CAMERA MOUNI 540-115011,REV 03,AVIIVA ATMEL CAMERA lin 540-115007.01

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FAST CORPORATION FV-2300 DOS IMAGING SYSTEM

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Enlarge

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FBM202 P0926EQ 8通道熱電偶/毫伏輸入接口組件

FBM203 P0914SV 8通道0-320熱電阻輸入接口組件

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 

FBM204 P0914SY 8通道0-20mA輸入輸出接口組件 

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FBM206 P0916CQ 8通道脈沖輸入接口組件

FBM207 P0914TD 16通道電壓監(jiān)視輸入接口組件(可選冗余)

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FBM207c P0917GY 16通道48Vdc觸點(diǎn)輸入接口組件(可選冗余)

FBM208 P0914TB 4通道0-20mA輸入/4通道0-20mA輸出組件

FBM211 P0914TN 16通道0-20mA輸入接口組件 FBM212模塊

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FBM214 P0914XN     8通道熱電阻輸入接口組件 FBM214模塊

P0914XQ     8通道HART通訊輸入接口組件 

FBM215 P0922VU 8通道HART通訊輸出接口組件 

FBM216 P0922VV 冗余8通道0-20mA/HART輸入接口組件

FBM217 P0914TR 32通道離散量輸入接口組件(可選冗余)

FBM218 P0922VW 冗余8通道0-20mA/HART輸出接口組件 

FBM219 P0916RH 24通道電壓監(jiān)視輸入,8通道離散量輸出接口組件

FBM220 P0917HA 1通道H1 FOUNDATION 現(xiàn)場(chǎng)總線接口組件

FBM221 P0917HB 4通道H1 FOUNDATION 現(xiàn)場(chǎng)總線接口組件

FBM223 P0917HD 2通道PROFIBUS-DP 現(xiàn)場(chǎng)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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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