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1．*處理單元（CPU） 
CPU作為整個PLC的核心，起著總指揮的作用。CPU一般由控制電路、運算器和寄存器組成。這些電路通常都被封裝在一個集成電路的芯片上。CPU通過地址總線、數據總線、控制總線與存儲單元、輸入輸出接口電路連接。CPU的功能有以下一些：從存儲器中讀取指令，執行指令，取下一條指令，處理中斷。 
2．存儲器（RAM、ROM）
 存儲器主要用于存放系統程序、用戶程序及工作數據。存放系統軟件的存儲器稱為系統程序存儲器;存放應用軟件的存儲器稱為用戶程序存儲器；存放工作數據的存儲器稱為數據存儲器。常用的存儲器有RAM、EPROM和EEPROM。RAM是一種可進行讀寫操作的隨機存儲器存放用戶程序，生成用戶數據區，存放在RAM中的用戶程序可方便地修改。RAM存儲器是一種高密度、低功耗、價格便宜的半導體存儲器，可用鋰電池做備用電源。掉電時，可有效地保持存儲的信息。EPROM、EEPROM都是只讀存儲器。用這些類型存儲器固化系統管理程序和應用程序。
 3．輸入輸出單元（I/O單元） 
I/O單元實際上是PLC與被控對象間傳遞輸入輸出信號的接口部件。I/O單元有良好的電隔離和濾波作用。接到PLC輸入接口的輸入器件是各種開關、按鈕、傳感器等。PLC的各輸出控制器件往往是電磁閥、接觸器、繼電器，而繼電器有交流和直流型，高電壓型和低電壓型，電壓型和電流型。  
4．電源  
PLC電源單元包括系統的電源及備用電池，電源單元的作用是把外部電源轉換成內部工作電壓。PLC內有一個穩壓電源用于對PLC的CPU單元和I/O單元供電。 
5．編程器  
編程器是PLC的zui重要外圍設備。利用編程器將用戶程序送入PLC的存儲器，還可以用編程器檢查程序，修改程序，監視PLC的工作狀態。除此以外，在個人計算機上添加適當的硬件接口和軟件包，即可用個人計算機對PLC編程。利用微機作為編程器，可以直接編制并顯示梯形圖。

GM PC Board GM3023B, #12329

GM PC Board GM3029B, #12323

GM PC Board GM3025B, #12322 

GM PC Board GM3027C Circuit Board #13177

GM PC Board GM3025B Circuit Board #13179

GM PC Board GM220A Circuit Board #13178

GM PC Board GM3021A, #12385 

GM Circuit Board GM3019A #11738

GM Relay Driver GM 3024 A, #12351

GM PC Board GM3026A Circuit Board #13181

GM Voltage Regulator Board GM3030A #13438

GM Circuit Board GM3020A, #11753

GM PC Board GM3027 D, #12331

GM Voltage Regulator Board, GM3030B, #12319

GM PC Board GM3016.1, REV B  #12320

HPM Mass Memory Board 1D703-0003, #15441

HPM Command 90 1D702-0008 Circuit Board #5996

HPM Counter Board 1D703-0007, #15443

HPM 1D702-0009 Command 90 Circuit Board, #7194

New HPM Control Board 1D703-0040 #39060

HPM AC Output Board 1D703-0009, #15448

HPM 1D702-0015 Circuit Board #8698  

HPM 1D702-0014 Circuit Board #8701  

HPM 1D702-0016 Circuit Board #8700 

Micromint Microprocessor Board RTC180 #37748

Sew Eurodrive Circuit Board 8224838.1C #42596

Morse Circuit Board MDC-8C #49381

Cincinnati Milacron PC Board 3-533-0610G #54193

Logical Devices MOS EE/EPROM Micro Programmer  Prompro-8X #55596

Boy Machines 2050-01-3 Relay Board #6800

Phoenix Contact Board UMK-SE 11,25 #49062

Miller PC Board LE-38 Control Board #13119

Boy Machines      PC Board      9626328      #17154

Power Miser Control Board FPV-01 #24890

Boy Machines PC Board     9626474     #17102

Verilink Control Card 320-100822-002 #55707

Sepro Robotique PC Board 07S0095104/A  CN89 #54594

Boy Machines PC Board  Binary I/O   9626378   #17098

AEC PC Board A0536808, #12318

Rexroth Analog Amplifier Card VT-VRPA1-151-10/V0/0 #56312

Boy Machines PC Board 9626340  #17153

Boy Machines GMBH 9 634 063 PC Board #6803

Boy PC Board 9626383, #17130

Bosch Circuit Board, 0811405007, 0 811 405 007, #6750

Grayhill I/O Rack Circuit Board 70RCK24, Rev E #51540

Gettys Circuit Board Module 11-0101-100, #11047

Willies Computer Software 4 Port Card DCI-930507 #50693

Allen Bradley X-361943 Clock PC Board #27105

Sew Eurodrive Circuit Board 8225850.16.19 #42601

Nordson Commuication Board 227119B #31875

Omron Output Unit  C200H-OD218 #7845

Miller Circuit Board 158160, 158162A KG-51 #28032

National Instrument PC Board SC-2072 Rev. A #51527

Feller Engineering PC Board FP16 #50586

Asea Brown Boveri   YT212001-AP/4   #49411

Gettys Circuit Board 11-0065-11, 11-0065-101, #11043

Vickers Control Board EEA-PAM-571-A-12 #60482

Cincinnati Milacon 3 531 3622A Circuit Board #3328

Omtron Temperature Control Board 569001D #17530

Hitachi Circuit Board LS520 #51035

Bailey Controls Circuit Board NTPL01 #7341

Kawaguchi Memory Card EUA-FJK916 #38376

Reliance 0-48652 Meter Calibration PC Board #22851

Feller Engineering PC Control  Board AF125 #51575

Motorola PC Board 84-W8094B01, #12349

Dart DC Drive Circuit Board #14841

Moog B53222-003 PC Board #17662

Selec Circuit Board 00403270 #63278

Indramat Program Module    MOD1/1X074-003   #45505

Gettys Circuit Board 11-0062-103, 11-0062-25, #11044

Cincinnati Milacron 3-531-3563A, 3 531 3563A Output Board   #26960

Miller Circuit Board 165463, 165465, KG-35 #28005
Augat 8160-VME109E Circuit Board #17668

Crydom I/O Mounting Board MS-4 #37756

Philips CPU Board 4022 230 1259  #17322

MOS Integrated Circuit Board 923.052,  923052 #8762

Allen Bradley X-233173A Odd Party PC Board #27104

Mitsubishi Circuit Board J2B-C11C, J2-F04 #42053

Unico PLC Board 319472.004 #13301

Reliance 0-51862-1 PC Board USAB Card #23078

Miller Circuit Board KG-12, 176532, #13126

New Circuit Board 123566 #30164

Sew Eurodrive Circuit Board 82335.1B #42602

Hyper Loop 162-0509 PC Board #20821

NEW Honeywell Power Supply 620-0041 #13828

Parametrics PC Digital Board 600048E #23093

Addison Tube Forming Board E-030301 #32281

Vickers Board 02-158342 Rev A #34189

Movomatic Relay Board  PC 3117a #5781

Miller Circuit Board 156623, 156625D, KG-33 #28053

Gordos I/O PC Board PB-24-V #55184

AVL Circuit Boards, RCCB, AFCB, #12530  

Allen Bradley Output Module 1771-OGC   #49076

Movomatic Relay Board PC 3117b #5782

Adept Tech PC Board 10330-00450 #8550

Boy PC Board 9626225 Circuit Board, #17128

Festo Circuit Board L-350740 #12073

New Reliance 0-52015 Operational Amplifier Board #23173

Fanuc Backplane Board  A20B-1002-0860  #51397

Festo IBS FE-NT/T3 PC Board #13203

Hyper Loop Amplifier PC Board 162-0315-002 #20816

Schneider Automation Inc Output Module   AS-BDAP-210   #50541

Bielomatik 07102999 PC Board #13307

Nova PC Board 021-5231-004, #12300

Sterl-Tronic Temperature Control Board 22731 #21899

Oc CPU Card 244-2083-004 #56340

Hyper Loop PC Board 162-0706-003, #20812

Miller Circuit Board 186969, 176532 KJ-39 #28044

Allen Bradley Chassis Board 960187 #47097

MPCS PC Board 197607, 182303 #30162

EEI PC Board Receiver-Transmitter #18206

Sew Eurodrive Circuit Board 8227772.13.14 #42605

Siemens Regulator Board 6RB2000-0GA00 #15276

SCI Epic CPU Board 22288 REV B, 52013 REV B #35907

PC Board 34BC0213 1SS G #17797

Static Controls Board CB-0974-301 REV C #29280

Festo IBS FE-BA/T3 PC Board #13204

Square D 50 WC Power Board 52045-018 #47081

PC Board with Transformer 162-1701 062-001 #20861

PC Board with Transformer 162-1701-001 #20862

PC Board with Transformer 162-1701-001 #20862

Nematron PC Board 110A0395E #26070

GM PC Board GM3019B #13187

Flex Weigh EB1591 UWI Keyboard Interface #16772

Cutler Hammer Control Windings Board 58-3741 #31822

STL Transtech Circuit Board   406-041-00   #49384

Quartech Circuit Board 600P46H03 #42660

Gettys Circuit Board 55-0050-00, #11079

SCI Circuit Board 080-2483 / 180-2483  #24189

Circuit Board 3000-2030 REV E #16359

Impact Systems Video Timing Card 05-1058-00 #33204

Osacom Control Board L3389D #25915

Mitsubishi Board A178B, B96351009 B #30923

Vickers Resolver Board 946339  Rev D #34184

Eurotherm Controls Circuit Board AE131255 #47427

Devlieg Circuit Board 9D1258A #20702

Static Controls PC Board CB-0974-311 #29281

US Robotics Modem USR5610B #43481

Allen Bradley TTL Output Module 1771-OG #51255

Allen Bradley ISO Circuit Board 140122 #13978

XYZ Technologies TBRD9801a #6795

Yaskawa Circuit Board D11-A91290-5 #47432

Allen Bradley X-233232 Phase Shift PC Board #27107

Grayhill I/O Module Board 70MRCQ24 #49380

Flowstream Universal Flow Monitor GM-1-DC-OFS #13778

Allen Bradley X-233175 Tally Reader PC Board #27106

Technisches Process Control Board K26RR #31858

NEW Astro System Card 100-6533 #10922

Numa Logic Input Module Board NL-351L #20788

Fanuc Output Module A03B-0801-C449 #51380

Honeywell Process Controller DC300E-E-000-10-0000-0 #48416

New Quartech Power Supply Board 8552 #43053

JSW Circuit Board ABA-21 #65038

IDC Corporation Power Supply Board SH21-PS #43152

Allen Bradley AC Output Module Board 1771-OA, #13111

Minster 490-0232 Brake Monitor / Control Unit #31711

Marquip 9117410 Tension Control Board #11298

GSE Inc. PC670H 40-20-21084 PC Board

Allen Bradley Circuit Board 74100-301-52 #36190

Circuit Board SS Proportioning 1094V0 #7156

Gettys Circuit Board 44-0027-00, 44-0027-102, #11049

Gettys Circuit Board Module 11-0099-100, #11046

Technitron Initiation & Main Valve Control Board 625702 #5908

New Upgrade Man Circuit Board UM653300 #42671

MFG Circuit Board, GM3026B, 115 Volt,  #11723

Buhl / Engel Control Card UDG 78.1 #29701

Ingersoll Rand 120596 Filter Circuit Board #7880

Toshiba ARNI-132CE PC Board #15272

US Drive PC Board 3000-2035 #6934

Reliance Electric TSTB Board #34573

Allen Bradley X-233164A Nand PC Board #27159

Star Ciruit Board 9737-PR01E #5876

Modicon I/O Analog Module    AS-B872-200   #46635

Fanuc Axis Control Board A16B-1211-0060 #51394

Allen Bradley PC Board    42305-052-04   #44482

New Rolm Dual OPS Card 59033A #33206

Lumonics Power Supply Card E81Z5561C #32863

NEW Reliance Electric 0-52808 Circuit Card, PC Board OLVA #20948

Indramat PC Board 109-0468-4B09-01 #51371

Thermocouple Board Assembly P402-2947  Circuit #15130

Gettys Circuit Board Module 11-0089-100,  #11045

Tecnomagnete PC Board 111501 #19180

Allen Bradley PC Board    42305-052-04   #44483

Static Controls PC Board CB-0974-311 Rev A #29137

Mitsubishi Circuit Board BN634A845H01 #42052

STI Light Curtain Control Board #15925

Bryant DC300 PC Board #12383

Miller Circuit Board 156623, 156625D, KJ-21 #28056

Fanuc Axis Control Board A16B-1211-0062 #51393

Mitsubishi PC Board  BN624A550G52 Circuit Board #8773

Westinghouse 5281C58H01 Data Plus Data Card #20637

Mitsubishi 5 Slot Rack Extension Board A55B #25687

Westamp Control Assy PC Board 33026-5 #24687

Siemens Analog Ouptput Module  Simatic S5   6ES5 470-7LB12 #48183

NEW Unico PC Board 317832, 317832.004, 400-451 Circuit Board #13308

Reliance Electric VLDC Board 0-51847-2 #34553

Siemens Module 6ES7 134-4FB01-0AB0 Simatic S7 #55000

SCI Circuit Board 080-2458-1 Rev A, 180-2458 Rev B #37854

Omron Sysmac Link Unit  C200HW-SLK24 #7846

Time Mark Corp 3 Phase Monitor  A257BM #54315

SCI Circuit Board 080-2305 Rev K, 180-2305 Rev H #27869

Power Miser Control Board FPW-01 #24896

Sterling 581-877734-00 PC Board #15138

Allen Bradley X-233166A, 1610P-K10N24  PC Board #27167

Dukane Circuit Board 110-1556 #14643

SCI Circuit Board 080-2355 Rev A, 180-2355 Rev. 0 #36634

Real Times Devices Industrial Control Interface AD1000 #43787

Data Technology Circuit Board 5150BX1 #32284

National Instrument PC Board SC-2072 #49399

MOS Integrated Circuit Board 923.057,  923057 #8765 

MOS Integrated Circuit Board 923.053,  923053 #8763

Allen Bradley Datamyte Controller    914-8   #48666

Force Computers SYS68K/CPU-6 #56723

Allen Bradley Chasis Board   960188-01   #46963

Harmo PC Board PCB-E052 #22068

MOS Integrated Circuit Board 923.055,  923055 #8767