可编程逻辑控制器实质是一种专用于工业控制的计算机，其硬件结构基本上与微型计算机相同，基本构成为：

一、电源

可编程逻辑控制器的电源在整个系统中起着十分重要的作用。如果没有一个良好的、可靠的电源系统是无法正常工作的，因此，可编程逻辑控制器的制造商对电源的设计和制造也十分重视。一般交流电压波动在+10%(+15%)范围内，可以不采取其它措施而将PLC直接连接到交流电网上去

二、中央处理单元(CPU)

中央处理单元(CPU)是可编程逻辑控制器的控制中枢。它按照可编程逻辑控制器系统程序赋予的功能接收并存储从编程器键入的用户程序和数据；检查电源、存储器、I/O以及警戒定时器的状态，并能诊断用户程序中的语法错误。当可编程逻辑控制器投入运行时，首先它以扫描的方式接收现场各输入装置的状态和数据，并分别存入I/O映象区，然后从用户程序存储器中逐条读取用户程序，经过命令解释后按指令的规定执行逻辑或算数运算的结果送入I/O映象区或数据寄存器内。等所有的用户程序执行完毕之后，**后将I/O映象区的各输出状态或输出寄存器内的数据传送到相应的输出装置，如此循环运行，直到停止运行。

为了进一步提高可编程逻辑控制器的可靠性，对大型可编程逻辑控制器还采用双CPU构成冗余系统，或采用三CPU的表决式系统。这样，即使某个CPU出现故障，整个系统仍能正常运行。

三、存储器

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。

四、输入输出接口电路

1．现场输入接口电路由光耦合电路和微机的输入接口电路，作用是可编程逻辑控制器与现场控制的接口界面的输入通道。

2．现场输出接口电路由输出数据寄存器、选通电路和中断请求电路集成，作用可编程逻辑控制器通过现场输出接口电路向现场的执行部件输出相应的控制信号。

五、功能模块

如计数、定位等功能模块。

六、通信模块

 

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 Allen Bradley 809-A22E Ser A Instantaneous Trip Relay

 Allen Bradley 6181P-15TP2KH VersaView 1500P Touch Panel Workstation DB

 Allen Bradley 1769-L35E/A CompactLogix 5335E Processor Unit E01

Ships Today ** 2015** 2711P-T7C4D8 Panelview Plus Ternminal

Rockwell Automation 1336TGTBSP1A Allen Bradley Communications Board

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 Sealed Allen Bradley 1326AB-B515E-M2K5L /B Servo Motor 460V AC 3200RPM

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 JOSLYN CLARK 4U4-2-240 PM D.C. ConTROL RELAY 4U42240

 ALLEN-BRADLEY 175A AMP BREAKER 140U-JD6D3-D17

 ALLEN-BRADLEY 175A AMP BREAKER 140U-JD3D3-D17

 ALLEN-BRADLEY 1747-L541C CPU MODULE

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 Allen Bradley 2711-T6C20L1 /B PanelView 600 Color/Touch/EtherNet/RS232

 Allen Bradley 2706-B23J8 Ser G Rev C CTRL FRN 3.02 DATALINER OPERATOR INTERF

 ALLEN BRADLEY 2706-B23J16 DATALINER OPERATOR INTERFACE PANEL SER G D330216

 Allen Bradley 2706-B13J8 Ser G Rev A CTRL FRN 3.00 DATALINER OPERATOR INTERF

 ALLEN BRADLEY 2193FZ MCC FEEDER BUCKET 150A 140U-I6C3-D15

 ALLEN BRADLEY 2094-DSD-HV100X /B 2094DSDHV100X

 Allen Bradley 2090 Ultra Shunt Module - 2090-SR020-36 Series A

 Allen Bradley 140U-JD6 140U-JD6D3-D20 3 pole 200 amp circuit breaker

 2711-T5A8L1 Ser B FRN 4.46 PanelView 550 Allen Bradley HMI Contents Complete

MPL-B430H-SJ22AA ALLEN BRADLEY SERVO MOTORS REMANUFACTURED

Modicon A242

GE 44A399742-G01

FANUC A06B-6059-H206#H511 AC SPINDLE SERVO UNIT A20B-1003-0020 base & FAN UNIT

Fanuc A05B-2051-C143

Factory Sealed 2014 1756-EN3TR Allen Bradley EtherNet Interface 1756EN3TR 163F

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Allen-Bradley Powerflex 700S 20DB4P2A0EYNANANE AC Drive 204 (208) VAC 4.2 Amps

Allen-Bradley MV SMC Interface Board 81000-199-55-R

Allen-Bradley Combination 512-DJBJ-6P Size 3 Non-fusible 24V Coil Nema 12 

ALLEN-BRADLEY 512-BCB-6P-24R NEMA Combination Starter, Disconnect Type, NEMA 1,

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Allen Bradley Y-2012-1-H04AA Servo Motor 60mm frame 115VAC Windings 4500RPM

ALLEN BRADLEY VERSAVIEW 1200P 6181P-12TPXPH SER B -?

ALLEN BRADLEY SP-170024  SP170024

ALLEN BRADLEY SP-151173 POWER SUPPLY **

Allen Bradley PowerFlex 70 Drive - 20A B 015 A3 AYNACG0 Series A

ALLEN BRADLEY POWER FLEX 70 20AE011A0AYNNNNN SERIES A * IN BOX*

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Allen Bradley Panelview 550 2711-B5A8 Ser H Frn 4.46 *Great Condition* 2711B5A8

ALLEN BRADLEY PANELVIEW 2711PC-T10C4D1 2711PC-T10C4D1 2012

ALLEN BRADLEY PANELVIEW 2711-K9A8 SER. F FRN: 3.13 **

Allen Bradley Panelview 1000 2711-K10C9 Ser B Rev C FRN 3.40

Allen Bradley Panelview 1000 2711-K10C15 Ser C Rev C FRN 4.20 Excellent Conditio

Allen Bradley Panelview 1000 2711-K10C15 Ser C Rev C FRN 4.20

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ALLEN BRADLEY PANEL VEW 2711-B6C9 SER. B FRN 3.13 **

Allen Bradley MPL-B540D-MJ24AA Servomotor

ALLEN BRADLEY MPL-B420P-MJ24AA  MPLB420PMJ24AA

ALLEN BRADLEY MPL-B310P-MJ24AA  MPLB310PMJ24AA

ALLEN BRADLEY MPL-A430H-SJ22AA  MPLA430HSJ22AA

ALLEN BRADLEY MCC BUCKET 2100 CENTERLINE SERIES 24" SIZE 3

ALLEN BRADLEY GUARD SHIELD 440L-R4J0800YD SER. A RECEIVER * IN BOX*

ALLEN BRADLEY F-4030-Q-H00AN  F4030QH00AN

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Allen Bradley Adjustable Frequency Drive, # 1333-YAA, Series C Stainless enc 

ALLEN BRADLEY AC DRIVE 25KVA 1336S-B020-AN-EN-GM1-HA2-L5 SER B

ALLEN BRADLEY AC DRIVE 1305-BA09A SER. C * OUT OF BOX*

Allen Bradley ABB HVAC Drive ACH550-UH-023A-4 K452 Series 550 Lonworks Adapter

ALLEN BRADLEY 960182  960182

Allen Bradley 91612702 Rev A 8000 KRIO Interface Module _ 916127O2

ALLEN BRADLEY 8600-2163B  86002163B

Allen Bradley 8600 2085K Remote I/O Interface Module 86002085K - 

ALLEN BRADLEY 849-ZOA32B  849ZOA32B

ALLEN BRADLEY 8410-MPSE  8410MPSE

ALLEN BRADLEY 810-A09AB  810A09AB

ALLEN BRADLEY 810-A07A  810A07A

Allen Bradley 809A10E NSNP **GENUINE** AB 809 A10E

Allen Bradley 809A09E  **GENUINE** AB 809 A09E

ALLEN BRADLEY 803-F412X SER.B **

ALLEN BRADLEY 709-EOA  709EOA

ALLEN BRADLEY 6186M-12PT  6186M12PT

ALLEN BRADLEY 6158-AAZAAZAZZZ  6158AAZAAZAZZZ

ALLEN BRADLEY 6157-BEZAAAAZZZ  6157BEZAAAAZZZ

ALLEN BRADLEY 6157-BEYAAAAZZZ  6157BEYAAAAZZZ

ALLEN BRADLEY 6156-ABZAAZZZZZ  6156ABZAAZZZZZ

ALLEN BRADLEY 6156-ABZAAZAZZZ  6156ABZAAZAZZZ

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Allen Bradley 500EOD930  **GENUINE** AB 500 EOD930

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ALLEN BRADLEY 2711E-K10C6 SERIES B COLOR LCD KEYPAD DH+ RI/O COMMUNICATION--SA

ALLEN BRADLEY 2711-B6C1  2711B6C1

ALLEN BRADLEY 2711-B5A8 SERIES H PANELVIEW 550 REV.B FREQUENCY 4.41

ALLEN BRADLEY 2711-B5A16X PANELVIEW 550 SER. H, REV. D, FRN: 4.46, REFURBISHED

ALLEN BRADLEY 2706-P42C  2706P42C

ALLEN BRADLEY 2706-M1D1  2706M1D1

ALLEN BRADLEY 2706-LV4R SERIES A REV C FRN 1.01 PANELVIEW * IN A BOX*

ALLEN BRADLEY 2412B-A030DBD-7F-24J-41-98D  2412BA030DBD7F24

ALLEN BRADLEY 22B-D017N104  22BD017N104

ALLEN BRADLEY 22996-006-01 DIGITAL METERING SYSTEM 240/120V-AC 1/2-1/3HP D307559

ALLEN BRADLEY 2112B-CDB-3-4RG-6S-7FC1H-11GK5-25R-42-79UL-111-901-850SHK  211

ALLEN BRADLEY 2102LB-BJBD-24JQ  2102LBBJBD24JQ

ALLEN BRADLEY 2100 SIZE 5 MOTOR STARTER 400 AMP BREAKER MCC BUCKET NO DOOR

Allen Bradley 2100 Centerline Bucket Center Size 4 100hp Plug MCC

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ALLEN BRADLEY 2100 15 AMP BREAKER 5 HP 480V AC DRIVE 1336 VFD MCC MCCB BUCKET

ALLEN BRADLEY 2100 1336t-b025-ax-gt1en 25HP AC DRIVE VFD MCC MCCB BUCKET

ALLEN BRADLEY 20AE3P9A0AYNNNNN POWER FLEX 70 SERIES A **

ALLEN BRADLEY 20AD8P0A0AYNNNNN  20AD8P0A0AYNNNNN

ALLEN BRADLEY 20AD3P4A3AYYAEG0  20AD3P4A3AYYAEG0

ALLEN BRADLEY 20AD3P4A3AYNNNNN  20AD3P4A3AYNNNNN

ALLEN BRADLEY 20AB028A3AYNANC0  20AB028A3AYNANC0

ALLEN BRADLEY 2094-BC01-M01 SER.A SERVO DRIVE * OUT OF A BOX*

Allen Bradley 194RNJ400P3  **GENUINE** 194RN J400P3

ALLEN BRADLEY 1797-IE8H  1797IE8H

ALLEN BRADLEY 1794-IT8  1794IT8

Allen Bradley 1791-16AC Module 179116AC With Manual (Pack of 3) - 

ALLEN BRADLEY 1785-O5G  1785O5G

Allen Bradley 1785-L20C15/1785L20C15 Controlnet Processor OFFERS ACCEPTED!!

Allen Bradley 1785-BCM /C PLC-5 Back-Up Communication Module F/W Rev G Qty

ALLEN BRADLEY 1784-T35 OPERATOR INTERFACE ***RFB***

ALLEN BRADLEY 1784-PCMC SER. B 1784-PCMK  1784-PCM5

ALLEN BRADLEY 1775-MR8  1775MR8

ALLEN BRADLEY 1775-MR8 MEMORY MODULE EXCELLENT  CONDITION

ALLEN BRADLEY 1772-ME16  1772ME16

ALLEN BRADLEY 1772-LN3  1772LN3

Allen Bradley 1772 ME8

Allen Bradley 1771-P2 SERIES A

ALLEN BRADLEY 1771-OQC  1771OQC

Allen Bradley 1771-OFO4 /1771-OF04 Output Module OFFERS ACCEPTED!!

ALLEN BRADLEY 1771-OAN  1771OAN

ALLEN BRADLEY 1771-NIVT  1771NIVT

ALLEN BRADLEY 1771-IFE SER.C ANALOG INPUT MODULE (12 BIT) * IN A BOX*

Allen Bradley 1771-IAD Module 1771-1AD (Pack of 10) - 

Allen Bradley 1771-DMC4/1771DMC4 Control Co Processor NICE!!! OFFERS ACCEPTED!!!

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Allen Bradley 1771 KX1

Allen Bradley 1769-L35E | CompactLogix EtherNet Processor - Mfg 2009 *NIBFS*

ALLEN BRADLEY 1756-MVID  1756MVID

ALLEN BRADLEY 1756-M14 -- 1756M14

ALLEN BRADLEY 1756-IT6I  1756IT6I

ALLEN BRADLEY 1756-EN2T -FS- 1756EN2T

ALLEN BRADLEY 1756-CNB  1756CNB

Allen Bradley 1756-CN2R /B

ALLEN BRADLEY 1747-L532  1747L532

ALLEN BRADLEY 1747-DSN -- 1747DSN

ALLEN BRADLEY 1746-NT4  1746NT4

ALLEN BRADLEY 1746-NO8I -- 1746NO8I

ALLEN BRADLEY 1746-NI16V -- 1746NI16V

ALLEN BRADLEY 170024  170024

ALLEN BRADLEY 140G-J6F3-D25  140GJ6F3D25

Allen bradley 1398-DDM-0D9 Servo Drive

Allen Bradley 1398-DDM-030 /A Ultra 200 3000W Universal Drive 1PH 110/240V AC

Allen Bradley 1398-DDM-030 /A Ultra 200 3000W Universal Drive 110/240V AC 1PH

Allen Bradley 1398-DDM-030 /A Ultra 200 3000W Universal Drive 110/240V AC 1 PH

Allen Bradley 1388B-AV40 H124 Bulletin DC Servo Controller

ALLEN BRADLEY 1388-AV40  1388AV40

ALLEN BRADLEY 1388-AV20-A  1388AV20A

ALLEN BRADLEY 1336S-BRF75-AE-EN4  1336SBRF75AEEN4

ALLEN BRADLEY 1336S-BRF75-AA-EN4-HA2-L6  1336SBRF75AAEN4H

ALLEN BRADLEY 1336S-BRF75-AA-EN4  1336SBRF75AAEN4

ALLEN BRADLEY 1336S-BRF30-AN-EN4-HASB-L6  1336SBRF30ANEN43

ALLEN BRADLEY 1336S-BRF30-AA-EN5-L5E  1336SBRF30AAEN51

ALLEN BRADLEY 1336S-BRF30-AA-EN4  1336SBRF30AAEN4

Allen Bradley 1336F-BRF20-AE-EN 15KW 460VC Drive | tested with 12 month warranty

ALLEN BRADLEY 1336E-BRF50-AN-EN-L9E  1336EBRF50ANENL9

ALLEN BRADLEY 1336B003EJDL3  1336B003EJDL3

ALLEN BRADLEY 1336-B003-EJD  1336B003EJD

Allen Bradley 1334 Frequency Motor Drive 1334-COB-K8NW_1334COBK8NW_1334-C0B-K8NW

ALLEN BRADLEY 1333-BAA  1333BAA

ALLEN BRADLEY 1326AB-A1G-11  1326ABA1G11

ALLEN BRADLEY 1305-BA09A-DE  1305BA09ADE

ALLEN BRADLEY 1305-BA06A-HA1 AC DRIVE **

ALLEN BRADLEY 100-B300NB3  100B300NB3

AB Allen Bradley 8410-KYBD 8000KYBD 8000KYBS Keyboard Complete 8000KBM

AB 512-CAB-6P-24R

2711E-K10C6 ALLEN BRADLEY PANELVIEW

2711-B5A8 ALLEN BRADLEY MonITORS CRT REMANUFACTURED

2706-B41J16 ALLEN BRADLEY MonITORS CRT REMANUFACTURED

1336F-AQF50-AA-EN-HASP-L6E ALLEN BRADLEY DRIVES REMANUFACTURED

1305-BA09A ALLEN BRADLEY DRIVES REMANUFACTURED

1305-BA04A-HA2 ALLEN BRADLEY MOTOR CONTROLLER

*  * Allen Bradley 1771-DE/B Series B Absolute Encoder Module

*  * Allen Bradley 1394-DIM AC Servo Controller Drive Interface Module