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

LINX 7300 MAIN CONTROL PCB BOARD TESTED/WORKING

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KLA INSTRUMENTS DP BOARD,710-65009?9-20 I2,FAB 073-650098-00 C0 #1

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NIKON PLAN 40/0.55,160/0-2?.5 ELWD

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POWER TEN DC POWER SUPPLHY 0-5V,0-365AMP,P?62B-5325D

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IMADA MV-500N-II,DPS-?20R, DIGITAL FORCE GUAGESES FULL AUTOMATIC,FUNCT?IONAL.

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ANELVA NANO-SCOPE,MICR?OSCOPE 911-9150,TOKYO OLYMPUS R10X

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NEC NRC-400II D8F 193-230044 DU8F1E

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OMRON SAFETY NETWORK CONTROLLER NE1A-SCPU01-V1

SEREN IPS 1401081000 REV D,440156100 2F,4601321000 BOARD

SEREN IPS BOARD 1400390000 REV C,4600780001,44?0119000,1400950?000,4601170000 T3

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PULSTEC MSG2-CONT BOARD 00DTC065,MSG2B-?100D

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TOSHIBA CORPORATION PI312,TPI312-S PLC

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

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HD 17-50-163055, HARMONIC DRIVE SYSTEMS,GEAR,GE?ARHEAD,REDUCER, #1

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MSE 100FX 800851,POSITRON NETWORKS 220F000603-401 MSE MOTHERBOARD,220?F000604-401

TEL BOARD PCB PST OPT 3281-000095-13, 3208-000095-11

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

NEC NRC-400II BOARD EXCHB 193-240197, EXCHA 193-240196 SET BROKEN

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FUJIKIN INCORPORATED PA N.C.,O.P. 0.45~0.6MPA,FS-?V31P, 316L AUJXX000 VALVE NEW

HD SF14-50, HARMONIC DRIVE SYSTEMS,GEAR,GE?ARHEAD,REDUCER,?#1

HD 17-100, HARMONIC DRIVE SYSTEMS,GEAR,GE?ARHEAD,REDUCER,?#3

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HD SF14-100-087360?, HARMONIC DRIVE SYSTEMS,GEAR,GE?ARHEAD,REDUCER,?#1

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VAT GATE VALVE 03009-MA24-1003?/0276 A-656507

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FUJI FPU081A,MICREX-?F PROCESSOR UNIT CPU FPU 081A-A10 #1

LENZE AC TECH SERVO DRIVER E94R090T4NRM,E9?4ZATBO2,POSITIO?NSERVO DIGITALSERVO 941

FUJI OEM GOLDSTAR FPU120,STARCON-?MF FPU 120A

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MOTOROLA MVME,VME 162-522A W/ TWO ETHERNET,LAN MODULE

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MOTOROLA MVME 162-222,01-W386?6B 48B,01-W3913B 02A BOARD

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Tencor instruments 4 Channel. motor control assy 261408 BOARD

Tencor instruments 4 Channel. motor control assy 261394 BOARD

TORAY ENGINEERING LC750 ZIRCONIUM OXYGEN ANALYZER %,PPM

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

FANUC BOARD A16B-2202-078

FANUC BOARD A16B-2203-0990/?02A

MPC-T0059A-11 BOARD IO MTR #03A TOB1059A NEW

PANASONIC AC SERVO MOTOR MSMA252A1D 2.5KW WORKING

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

DRESSLER CESAR 2720 BOARD H-35-00-01

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FAST CORPORATION FV-2300 DOS IMAGING SYSTEM

GOLDSTAR FUJI STARCON-MF F80 PROCESSOR UNIT FPU080A

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YASKAWA JUSP-WSCB60AA,J?USP-WSCA60AA WS60AA,FUJI 6R1TI30Y-080,6M?BP200RA060-06

YASKAWA SERVOPACK JUSP-WSCB 30AA,JUSP-WSCA3?0AA,JUSP-WSCD 30AA,JUSP-WS30A?A,FUJI 6

FUJI FPU081A,MICREX-?F PROCESSOR UNIT CPU FPU 081A-A10

AWARD SOFTWARE BOARD A60267-03-30 REV J

OVAL LUS52C11-A406 NEW

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SCHROFF POWER SUPPLY NETZG.MPS022

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Schneider 140CRP93100 RIO HEAD NIB

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TOKYO SEIMITSU HA1136 VARIABLE POWER SOURCE TSM-LH-493 ILLUMINATOR FOR A-WD-208T

YASKAWA SGDM-04ADA,SGMP?H-04AAAGB61,HD GEARHEAD CP-25A-11-J602B?-SP,DRIVER MOTOR

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Enlarge

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FBM201d P0922YK 8通道0-10V輸入接口組件

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 

FBM205 P0914XG 冗余8通道0-20mA輸入/輸出接口組件

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)

FBM207b P0914WH 16通道24Vdc觸點(diǎn)輸入接口組件(可選冗余) 

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

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

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)場總線接口組件

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

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