PLC的主要模塊構成（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。

  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，開關量輸入模塊用來接收從按鈕；選擇開關、數(shù)字撥碼開關、限位開關、接近開關、光電開關、壓力繼電器等過來的開關量輸入信號；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備，模擬量輸出模塊月手來控制調節(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)場調試和維護。

    使用編程軟件可以在計算機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，并可以實現(xiàn)不同編程語言的相互轉換。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。程序可以存盤或打印，通過網(wǎng)絡，還可以實現(xiàn)遠程編程和傳送。

    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)提供24V直流電源，驅動PLC負載的直流電源一般由用戶提供。

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YASKAWA BOARD JASP-WRCA01B

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YASKAWA DC BRUSHLESS MOTOR DRIVER CBTR SN18A-TS5 VER 0.2A,TSR184F-1 N.N5723-1

TOSHIBA PROSEC T3 PLC,TPS361-S,IF?311,PU326H,SN32?1 SSN321-MS,DI335?H MC392,DO334,

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

LINX 7300 MAIN CONTROL PCB BOARD TESTED/WORKING

KLA INSTRUMENTS 8IB BOARD,710-65301?6,FAB 073-653015 REV B1

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

JDS UNIPHASE LASER 1135P-3500,AND LASER POWER SUPPLY 1216-2 WORKING

KLA INSTRUMENTS BOARD 710-609995-003 AA

GSI LUMONICS LINEAR SERVO ACTUATOR,TRILOG?Y EMC&LVD,COPLEY CONTROL 7225DC DRIVE

LEICA LEITZ PL FLUOTAR, ∞/- 2.5X/0.07,32X/0?.75,100X/0.90,5?0X/0.85,20X/0.4?5

LEITZ WETZLAR LENS ∞/0 PL APO 150X/0.90 D

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KLA INSTRUMENTS 8IB BOARD 710-659465,FAB 073-653015-00 B1

BROOKS AUTOMATION 001-1951-02 REV C9 BOARD,PN 11951,PCB 11950

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YASKAWA CONTROLLER JZRCR-XC002B

EPSON COMPUTER PC-486HA,PC486H?A2 AC100V WORKING

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

KLA ALIGNMENT PROCESSOR [AP2] BOARD,710-65804?1-20 REV A0,FAB 073-655005-00 A1

KLA ALIGNMENT PROCESSOR PHASE 3 BOARD,710-65804?1-20 REV C0,FAB 073-658040 A0

KLA ALIGNMENT PROCESSOR [AP2] BOARD,710-65804?1-20 REV A0,710-655005-0?0 REV A1

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

TOSHIBA PROSEC T3 PLC,TPS361-S,IF?311,PU326H,SN32?1 SSN321-MS,DI335?H MC392,DO334#

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

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KLA tencor AMERICAN MEGATRENDS 30-0200-D01247-?00101111-050591?-PEAKDM_B-F WORKING

MIYACHI COMPACT LASER WELDER ML-2130A,2030B,?CHILLER

MIYACHI COMPACT LASER WELDER ML-2130A,2030,P?OWER MODULE

RORZE RA210-C12-004 BOARD 2R-078-A,E-262A?,E-237D [2PCS]

FUJI MICREX-F FPU120S,PROCESS?ON UNIT CPU FPU120S-A10

ELECTRO CRAFT BRU-200 DM-30 9101-1133 BRUSHLESS SERVO DRIVE RELIANCE

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KLA FFA ASSY BOARD 710-610522-000/?AB

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

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MKS ASTEX PRODUCTS TSP REMOTE,ASTEX GMBH PN 14-0040-002

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KPE,KIMBALL PHYSICS ELECTRON GUN POWER SUPPLY EGPS-1106

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NEC NRC-400II BOARD MC5-A 163-237410

COGNEX IN-SIGHT 1700 800-5748-10 WAFER READER

NEC NRC-400II D8F 193-230044 DU8F1E

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FUJITSU FPF8050HRUC-001?,N16B-5241-0001?,S1506-PC2613

HD 17-50-205545, HARMONIC DRIVE SYSTEMS,GEAR,GE?ARHEAD,REDUCER,

HD SF14-50-180188, HARMONIC DRIVE SYSTEMS,GEAR,GE?ARHEAD,REDUCER #1

NOVOTRON GMBH NOVODRIVE ND21-5605KS-011?-01

RIVERDELTA NETWORKS BSR-1000 CMTS /FAIL ALAM

FUJI VME 4400 VISION CONTROL BOARD fram GRABBER COGNEX

TEL BOARD PCB PST-STD 3281-000146-12,?3208-000146-11

MIYACHI COMPACT LASER WELDER ML-2130A,2030,C?ONTROL PCB

TOB1093 CHEMICAL I/O BOARD 02A,CPC-T0081A-?12,100-T0082A-1?2,P11070074

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

Tencor instruments I/O memory universal handler 172502 board

DAIICHI DENTSU AFC1200 SYSTEM AXIS CONTROLLER AXIS203A

DAIICHI DENTSU ARC1100 SYSTEM AXIS CONTROLLER AXIS003A

DAIICHI DENTSU AFC1100 SYSTEM AXIS CONTROLLER AXIS103A

INTERFACE AZI-2430 BOARD 'LOT OF 6'

YASKAWA SERVOPACK DRIVER SGDV-120A05A

YASKAWA SERVOPACK DRIVER SGDS-08A05A

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A-B ALLEN-BRADIEY 1771-QH A,FORCE CONTROL MODULE,1771-WF #1

KLOCKNER MOELLER DIL M 580 820-XHI, FREE SHIPPING

ORIENTAL MOTOR 5-PHASE DRIVER RKD514L-C 5-VEXTA STEPPING MOTOR A3874-9215NED

KLOCKNER MOELLER NZM 10-600N-NA 600A, FREE SHIPPING

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

NACHI ROBOT AR CONTROLLER ROP300,U11-A01

TOSHIBA CORPORATION PI312,TPI312-S PLC

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

HD 17-50-180863, HARMONIC DRIVE SYSTEMS,GEAR,GE?ARHEAD,REDUCER,

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

TOKYO SEIMITSU HA1120A DIVIDER BOARD[2PCS]FOR A-WD-208T

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

GSI LUMONICS SMART MOTOR SM2310SQ-VRE

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

HD 14-100, HARMONIC DRIVE SYSTEMS,GEAR,GE?ARHEAD,REDUCER,?#4

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

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

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FANUC BOARD A16B-2202-0420/?07E #1

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

PANASONIC AC SERVO DRIVER MDDDT3530L01,1.?0KW

KLA 073-404555-00 710-404556-00 STEPPING DRIVER BOARD

Olympus UL WD NeoSPlan50, IC50 0.55 ∞/0 f=180

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

LINX 7300 LCD SCREEN TESTED/WORKING

JAE JAPAN AVIATION ELECTRONICS INDUSTRY E280-000044-11,?UT3-TLN7-B

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HD 14-88-413903, HARMONIC DRIVE SYSTEMS,GEAR,GE?ARHEAD,REDUCER

MOTOROLA MVME 162-533A BOARD 84-W8960B01E,01?-W3960B 70D,64-W4125COI?A REV A

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

FANUC A16B-1000-0030/?04C,A20B-0008-0?440/03,A20B-000?8-0430/05A

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

Tencor instruments 4 Channel. motor control assy 184586 BOARD

FAST CORPORATION FV-2300 DOS IMAGING SYSTEM

GOLDSTAR FUJI STARCON-MF F80 PROCESSOR UNIT FPU080A

YASKAWA SERVOPACK SGDH-10AE TESTED WORKING

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

SBC,PC,CIS-C3A-?D1 CPU BOARD TESTED WORKING

KLA IO BOARD PART NO. 073-404423-00,A?SSY NO. 710-404420-00

SCHROFF POWER SUPPLY NETZG.MPS022

OLYMPUS MICROSCOPE BX SERIES BX-60M POWER SUPPLY,TESTED

RKC Temperature Controller REX-C2000,C2001?-4F32C-V WORKING

FANUC board bmu 256-4 A87L-0001-0018 08G

Schneider 140CRP93100 RIO HEAD NIB

YASKAWA CONTROLLER JZRCR-XSU02

MULTILIN MM300-GEHP1CACX?,PSU,CPU,IO-C,I?O-A,IO-C #2

PULSTEC O-PAS 1000A BOARD,GPIB-SUB OPA-011-01,GPIB?-MAIN OPA-010-01

ASYST TECHNOLOGIES BOARD 3200-1000-07 REV B,4001-1788-01 B IM,FAB 3000-1000-06 C

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

KLA IO PART NO. 073-404423-00,A?SSY NO. 710-404420-00,C?D-2-94V0 43/95 BOARD

CELERITY UNIT 125 IFC-125C MASS FLOW CONTROLLER,VALV?E NC,CKD MAGD-10V-AT2-JS?3 *

PROFORT 820 TEACH PENDANT PF820-DSETM3 NEW IN BOX

RKC FAREX SRM H-PCP-A-14N-M*A?B SR MINI HG SYSTEM,H-TI0-B-?DK09-D*NN,H-TI0?-B-FK09*

PULSTEC LAND PRE-PIT DECODER 2 (DDU-S/A) PSB021DD-000-0 BOARD #2

PANASONIC SERVO MOTOR MSM021A1E,KEG2-?20 R-0111 WORKING

FUJI VME IS70B SERVO BOARD

CHEROKEE INTERNATIONAL POWER SUPPLY CAR3030,CAR3030?L1-1A

YASKAWA SERVOPACK DRIVER MOTOR SGDA-02AP,SGM-0?2A3G26,HD CP-20A-11-J602A?-SP CNC

MELEC C-823 BOARD KP1229-2

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EATON 180 CONT REMOTE PCB 1417660 B,1517660 C BOARD

INDUSTRIAL SBC,PC,IPC,PCIS?A-C800EVN-1G-SA?M V1.3 BOARD

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Enlarge

CONTEC PI0-64/64L(PCI) NO. 7196B BOARD

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TSE TILT TESTFR VER:1.0 BOARD

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KLA INSTRUMENTS IP VME BOARD 710-806050-01 REV D0A WORKING

KLA INSTRUMENTS IP VME BOARD 6001756-03 REV R0 WORKING

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diversified technology CXT100A ASSY 912000245 BOARD

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THK KR33 LM GUIDE ACTUATOR,KR33A LINEAR MOTION STAGE

THK KR30 ACTUATOR

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FBM201c P0922YJ 8通道0-5V輸入接口組件

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觸點輸入接口組件(可選冗余) 

FBM207c P0917GY 16通道48Vdc觸點輸入接口組件(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通道觸點輸入，8通道離散量輸出（外部源）組件

FBM214d P0914WP 8通道觸點輸入，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雙波特率智能設備接口組件 

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P0904AP