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#图片仅供参考#
1．*处理单元（CPU）
CPU作为整个PLC的核心，起着总指挥的作用。CPU一般由控制电路、运算器和寄存器组成。这些电路通常都被封装在一个集成电路的芯片上。CPU通过地址总线、数据总线、控制总线与存储单元、输入输出接口电路连接。CPU的功能有以下一些：从存储器中读取指令，执行指令，取下一条指令，处理中断。
2．存储器（RAM、ROM）
存储器主要用于存放系统程序、用户程序及工作数据。存放系统软件的存储器称为系统程序存储器;存放应用软件的存储器称为用户程序存储器；存放工作数据的存储器称为数据存储器。常用的存储器有RAM、EPROM和EEPROM。RAM是一种可进行读写操作的随机存储器存放用户程序，生成用户数据区，存放在RAM中的用户程序可方便地修改。RAM存储器是一种高密度、低功耗、价格便宜的半导体存储器，可用锂电池做备用电源。掉电时，可有效地保持存储的信息。EPROM、EEPROM都是只读存储器。用这些类型存储器固化系统管理程序和应用程序。
3．输入输出单元（I/O单元）
I/O单元实际上是PLC与被控对象间传递输入输出信号的接口部件。I/O单元有良好的电隔离和滤波作用。接到PLC输入接口的输入器件是各种开关、按钮、传感器等。PLC的各输出控制器件往往是电磁阀、接触器、继电器，而继电器有交流和直流型，高电压型和低电压型，电压型和电流型。
4．电源
PLC电源单元包括系统的电源及备用电池，电源单元的作用是把外部电源转换成内部工作电压。PLC内有一个稳压电源用于对PLC的CPU单元和I/O单元供电。
5．编程器
编程器是PLC的zui重要外围设备。利用编程器将用户程序送入PLC的存储器，还可以用编程器检查程序，修改程序，监视PLC的工作状态。除此以外，在个人计算机上添加适当的硬件接口和软件包，即可用个人计算机对PLC编程。利用微机作为编程器，可以直接编制并显示梯形图。
Copeland Discus Refrigeration Compressor 3DB3-0750-TFD #56571
Copeland Discus Refrigeration Compressor 3DB3-075E-TFD-251 #56570
Connectors / Clamps 2C, 1 1/2" Diameter, 5" Length #13162
NEW Harting Connector MTC12G #26761
Allen Bradley Station Connector 1770-SC #2967
Harting Connector H-BE-6-SS #17486
Phoenix Contact Interbus IBS CT24IOGT-T #8667
Automation Direct Connector Module ZL-CM24 #18636
Allen Bradley 1492-H #24580
Harting Connector Insert #20558
Harting Connector H-BE-10-1970, #17484
Phoenix Contact Housing Holder Hood #20235
Parker Quick Coupling H8-62 60 Series Connector #30462
Connector Housing Z410 #20463
NEW Harting Connector 0914003300200, HAN 3 MOD-STI-C #13193
Hubbell Midget Twist Lock Receptacle HBL7593 #16555
ILME CYR16.3 Cable Passing Hood #13471
Phoenix Contact Housing Holder #20236
Square D Seriplex Mini-T Connector 5 Pin #13619
NEW DDK Connector DM S3106A 14S 6S #24449
NEW Souriau Connector 85 06 / 3476L10-6P, 6 PIN #29325
Interbus Module, IBS CT2410GT-T, #11739
Honeywell Resistor 4-20ma 30754466-501 #13773
Infrared Heater 250 Watt, 277 Volt #43570
Aero Industrial Strain Relief AE141L24-31P-G #34451
Amphenol Advantage Line P27939, Housing #11152
Box of 12, Male Hose Connector, 2" OD #13160
Contact Electronics Housing H-B16T #20241
Harting Connector #13457
Phoenix Contact Connector Hood #20466
Phoenix Contact Housing Holder Hood #20232
NEW Cooper Crouse Hinds CHDN-TAER-NG Connector #5373
NEW Amphenol Aerospace 97-3108B-28 #32534
Lumberg Devicenet Distribution Box 0931 DNC 302 #35282
New Parker Straight Thread Connector 10-1/4F50G-S 29465
NEW Box of 2 Thomas Betts Connector 32511 #10300
New Harting Connector Housing HAN 6B GS 13.5 #31477
PT Hose Clamp 20B, 2" #22445
NEW Harting Insert, 02 #20560
Phoenix Contact Housing Hood #20240
Phoenix Contact Connector Hood #20465
Crouse Hinds T-Connector #12630
New Box of 6 Hilti Metal T-Connector MQV-3/2D #29047
Canfield Connector 810-100-031, *NEW* #17554
New Box of 17 Appleton BX Box Connectors 7287V #30914
NEW Parker Straight Thread Connector 10-1/4 F50G-S #29466
Amphenol Advantage Line P27955 Housing #11146
Harting Connector 0914100313 #13192
New Omega Connector PT06F8 #40059
NEW Harting Hood 00 #20557
Phoenix Contact Housing Hood #20239
NEW Cam-Lok E2125-2 Female Connenctor #13468
Amphenol Connector Rail Mount, 20-51039, #11705
New Square D SPXTMQ5 T Mini Connector 5 Pin #29210
Hubbell Twist-Lock 50 Amp, 2 1/8" Diameter #26651
New Appleton Malleable Iron Conduit C125-M #31320
NEW Wago Connector J-Box 773-168 Pushwire #20555
New Parker 1JC43-16-16 Fluid Connector #29467
NEW Hubbell Connector Body HBL7464V, 15 Amp #23374
Harting Connector MTC8G #39067
Hubbell Connector 60A600VAC #61774
emecanique Interlock XCS-A713, 3 Amp, #21360
Picolight Optical Transceiver PL-XPL-VC-S23-12 #36885
NEW Box of 10 Legris Straight Connector 31755611 #16591
Hoffman Flange Coupling C-CS5FC *NEW #13467
New Parker Fluid Connector 1J743-20-20 Fitting #28798
Parker Fittings 8R50L0-S, Box of 4 Tee Fitting #28796
Picolight Optical Transceiver PL-XPL-00-S23-23 #36882
NEW Parker Straight Thread Connector 10-1/4 F50G-S #29466
Picolight Optical Transceiver PL-XPL-00-S13-21 #36879
Phoenix Contact IBS-ST-24-SSC-T REF# 10472
New Schurter Power Connector 4735-0000 #39451
New Parker In Line Swivel Joint PS Series #21649
NEW Amphenol Aerospace Connector 97-3106A-28 0850 #32492
Picolight Optical Transceiver PL-XPL-00-S23-23 #36881
New Box of 5 Parker Fluid Connector IFU43-12-12 #30456
New T&B Strain Relief 2" Cord Connector 2285 #28167
Banner Power Block Maxi Beam RPBT #30598
New Amphenol Connector Plug ACC08E32-5R #40081
Box of 8 ETC Aluminum Male Hose Connector F2 2" OD, 10 5/8" Length #13161
New Parker In Line Swivel Joint PS Series #21650
Square D TBX DSS1622 Base Unit #11104
Allen Bradley Contactor 100-C12D10 #42085
Allen Bradley Contactor Series A 100-C09*10 #49771
Allen Bradley Motor Starter Contactor 709-DOD93 #29276
Allen Bradley Contactor Relay Series A 700-CF220Z #46868
Allen Bradley Contactor 100-A75N*3, 75 Amp, #8837
Allen Bradley Contactor 500L-BOD92, 30 Amp #29515
Allen Bradley RL4RD022T Contactor #11886
Allen Bradley Contactor 100-C60*00 w/100-S Series B #44455
Allen Bradley Contactor 100-A12NZ*3 #38085
Allen Bradley Contactor 700-CF310Z* #50733
Allen Bradley Contactor Series B #47098
Allen Bradley Contactor 100-A12ND3 Series B #30081
Allen Bradley Contactor 100-A24ND3, 24 Amp #11861
Allen Bradley Contactor 100-A09ND3, Ser A #11756
Allen Bradley Contactor 100-A09NZ*3, Series B, Coil 24 VDC #35913
Allen Bradley 100-A30N2*3 Contactor 30 Amp #26007
Allen Bradley Contactor 100-A24NA3, Series C #41799
Allen Bradley Contactor 45 AMP 500-COD930, #5859
Allen Bradley Contactor Module 40410-855-03 #30513
Allen Bradley Contactor 500L-AOD93 #29562
Allen Bradley Contact Kit 702L-TOD93, Series K #33525
Allen Bradley Contactor 702-BOD92 Series K, #14541
Allen Bradley Contactor 100-A09ND3, 9 Amp, 3 Pole, Series B #41825
Allen Bradley Contactor 500F-BO*930, 27Amp, #13695
Allen Bradley Contactor 500-COD930, Series A, Size 2 #42679
Allen Bradley Contactor 500F-BO*930, 27Amp, #13666
Allen Bradley 500PM-BOD93 Contactor #29558
Allen Bradley Contactor 500F-DOD930 #42681
Allen Bradley AC Contactor 500L-DOD92 #55239
Allen Bradley DC Contactor 123166 #55443
Allen Bradley Contactor Relay Series B 500-A0D93 #50058
Allen Bradley Contactor Series A 100-C09D*400 #46869
Allen Bradley AC Contactor 500FL-BOD93, Series B #25677
Allen Bradley 500L-AOD93 AC Contactor #12198
Allen Bradley Contactor 100-A60N*3, Series C #44070
Allen Bradley Contactor 500F-BOD930 Series B #32082
Allen Bradley AC Contactor 702L-B0D Series K #25684
Allen Bradley Support Contact F-20323 #3319
Allen Bradley 100-A12ND3 Contactor, 12 Amp #11800
Allen Bradley 500L-DOD93 Contactor #6565
Allen Bradley Contactor 500-DOD930, 90 Amp, #14580
New Allen Bradley AC Contactor 500L-AOD93 15/20A #29110
Allen Bradley Contactor 100-D300 #54044
Fuji Electric Contactor SC-4-0 #39500
Fuji Electric 4NC0H0 Contactor #11852
Fuji Electric Contactor SC-4-0/G #39501
Fuji Electric Contactor SC-4-0/G #39502
Fuji Electric Magnetic Contactor SRCa3631-0(3a1b) #34770
Fuji Electric Contactor SC-0/G #39495
Fuji Electric Contactor 4NC0H011, #12280
Fuji Electric 4NC0AO Contactor #11895
Fuji Electric Magnetic Contactor SJ-0G #43401
Fuji Electric Contactor 2NC4H0 #37457
Fuji Electric Contactor 2NC3H0 #37380
Fuji Electric Contactor 2NC3H0 #37377
Mercury Switches Mercury Contactor 33520AT #22878
Durakool Mercury Relay Contactor 1M35A120AC #15505
MDI Mercury Contactor 43520A-18 #11808
MDI Mercury Contactor 330N0-120AU #47817
Mercury 33520A Contactor #11805
MDI Mercury Contactor 335N0-120A, 35 Amp, 600 Volt #47440
Sprecher & Schuh Auxiliary Contact CS3-P #29914
emecanique Auxiliary Contactor CA3 SK20BD NEW #17272
emecanique Contactor LP1K1210BD3 #19240
emecanique Contactor LP1K0901BD3, 20 Amp, 600 Volt #47774
New Furnas Contactor 45DG10AF #30169
General Electric CR7CA Contactor, 25 Amp, 3 Pole #14522
Stromberg Welding Contator WC 5 #31948
Omron Contactor J7L-22 #39521
General Electric Contactor CR353AD3BA1 #33536
emecanique Contactor LA1DN22 #31702
Westinghouse Contactor A201K0CA, Size 0 #30088
Meiden Contactor 24320-21560-71 #37726
Square D Contactor 8536-SBO2SA #33178
Prestolite Contactor HB407KF360BA #38498
Orsco Lubrication Control LCM-100M #8137
Sylvania Contactor T77U011 #42973
Square D / emecanique Contactor LC1 D09 #24741
emecanique Contactor LC1D123 #13604
Square D Contactor 8536-C0-3 #46778
General Electric, GE Contactor CR453AD3ABB #34695
General Electric CL45 Contactor #16830
Durakool Contactor Switch 3050A120AC #14130
Omron Contactor J7L-09 #39504
emecanique Contactor LC1D18, 32 Amp #38081
ASEA Brown Boveri Contactor EH6-31E #43713
ASEA Brown Boveri Contactor EH6-31E #43716
emecanique Contactor LC1F500 #53862
emecanique Contactor LC1 D1210, 3 Pole, #14329
emecanique LC1-D12, 25 Amp, #13705
Klockner Moeller Contactor DIL6M, 3 Phase, 200 Amp Open #31731
Yaskawa AC Magnetic Contactor HP-20GF1T/10 #36774
Moeller Contactor DIL00M-G-10, 3 PH #43695
Cutler Hammer Contactor Series B1 Nema Size 3 C10EN3 #52929
Cutler Hammer Starter 9586ED58G Size 1 #27066
Square D Contactor 8910-DPA12, Series A, 25 Amp #38089
Asea Contactor EH22C-22, A600, P600, 10 Amp #43717
ABB Contactor BC25-40-00 #50613
ABB BBC Brown Boveri BC9-40-00-A, 16 Amp #26745
ABB Relay Contactor KC31 #43694
General Electric Contactor CL00D310T, 3 Pole, #17003
General Electric Contactor CR353FF38*1 #14584
emecanique Contactor LC1 D1201, 25 amp #44129
Sprecher & Schuh CA7-12-10 Contactor #19032
ABB Welding Isolation Contactor EHW 250 #16997
General Electric Auxiliary Contact BCLL20 #31619
Danfoss Contactor CI 9, 9 Amp, CI9, #30085
Carlo Gavazzi RN1A48A30 Semi Conductor Contactor #18596
BBC Petercem Contactor BC15-40-00-A 25 Amp #26746
emecanique Contactor LC20129 A60 #22032
AEG Contactor SH04 22Z, Coil 24 VDC #18655
New Allen Bradley Auxiliary Contact 595-AA, Series B #43940
emecanique Contactor LP1K12004BD 3 #19239
Joslyn Clark Contactor 7000-7140-11 #34750
General Electric CL25D310T Contactor #11900
Allen Bradley Auxiliary Contact 195-FA11 #31317
emecanique Contactor LP2D1801 #31796
emecanique Contactor LC1D115, DS06062 #43707
Hitachi AC Magnetic Contactor H10B-R #60916
emecanique Contactor LCI-D123, #12611
Sprecher & Schuh Contactor, CA7-30D-00, #11803
General Electric Contactor CR253DB302AAA, 3 Pole #33546
Square D Auxiliary Contact Series B SX-6 Class 9999 #30507
emecanique Contactor LPI D2510 #18647
ABB Drive Contactor EFLG 315-2P #58977
ABB Contactor TA25 10 Amp, #13605
Cutler Hammer Contactor 9656ED62 Contactor #27094
Sylvania Contactor A77-288514A-3, 50Amp #23972
MDI Mercury Contactor 23020A #26646
NEW ABB Welding Isolation Contactor EHW 250, #15246
Pertron Circuit Board 1400382 Processor PCB #32204
Cutler Hammer Contactor 9656ED5G Contactor #27418
General Electric CR353AD2DA1 Contactor #15143
General Electric Contactor CR356AD3B*1 #36656
Idec Contactor YSIN-180F #34556
General Electric Contactor CR453AD3ABB #33487
Moeller Contactor DIL1AM, 3 Pole, 3 PH #43690
Asea Contactor EH6C-31E, NEMA A600, P600, 24 VDC Coil #43709
Cutler Hammer Power Unit Series A1 C10DX #52911
emecanqie LC1 D09 10 Contactor 20 Amp #27475
Toshiba Magnetic Contactor C-180E #58050
Cutler Hammer Starter 9586ED58G Size 1 #27065
Westinghouse Motor Control A201K0BA #32899
General Electric Contactor 453AD3ABB #33496
General Electric Contactor CLOOD310T & BSLDZ #17045
General Electric Contactor MCOC310AT, #21532
General Electric Contactor CR305C0 #38960
Carlo Gavazzi Semi Conductor Contactor RN1A48A30 #18595
Joslyn Clark Contactor 7000-7140-11 #34663
Bussman Fuse NON 400, 250 Volt #31843
emecanique Contactor LC1 D09 BD #31699
Joslyn Clark Contactor 7000-7140-11 #34664
emecanique Contactor CAD50 BD #31617
ABB Drive Contactor EHDB360C 2P-*L #59315
emecanique Contactor 400 AMP LC1-F400 #7060
Prestolite Contactor HB409KC360EA #38502
emecanique Contactor LC1 D2510 #44131
emecanique LC1D09REQ3826G15 Contactor #10196
Westinghouse Contactor A201K0BA, 18 Amp #29882
Westinhgouse LIfe LIne Contactor NR-330, Size 3, 3 Pole #34086
General Electric Contactor CR353AD3D*1 #33486
emecanique Contactor LC1D115006, with LA8DN11 #43692
New Westinghouse Contact Kit 626B187G13 #43325
emecanique Contactor LC1 D8011, 240 Volt #44072
emecanique Auxiliary Contact LA1DN13 #31792
Fuji Electric Contactor 2NC3H0 3 PHASE #37455
Square D Definite Purpose Contactor 8910DPA13V09, 3 Pole, Series C #39456
General Electric Contactor CR253DB302AAA, 1PH, 3 Pole #33545
ABB Contactor BE63, 3 pole, 37KW #6953
emecanique Contactor LC1 F150 #34322
Siemens Contactor 3TF5 022-OAK6 #64714
Cutler Hammer Contactor CE15ENS2, Series B1, 1 PH, 50/60 Hz #35722
Westinghouse Contactor A200M5CAC 120V #8016
Siemens CXL40*3E Contactor 135 Amp #22922
