103620

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可编程序控制器，英文称Programmable Controller，简称PC。但由于PC容易和个人计算机（Personal Computer）混淆，故人们仍习惯地用PLC作为可编程序控制器的缩写。它是一个以微处理器为核心的数字运算操作的电子系统装置，专为在工业现场应用而设计，它采用可编程序的存储器，用以在其内部存储执行逻辑运算、顺序控制、定时/计数和算术运算等操作指令，并通过数字式或模拟式的输入、输出接口，控制各种类型的机械或生产过程。PLC是微机技术与传统的继电接触控制技术相结合的产物，它克服了继电接触控制系统中的机械触点的接线复杂、可靠性低、功耗高、通用性和灵活性差的缺点，充分利用了微处理器的优点，又照顾到现场电气操作维修人员的技能与习惯，特别是PLC的程序编制，不需要专门的计算机编程语言知识，而是采用了一套以继电器梯形图为基础的简单指令形式，使用户程序编制形象、直观、方便易学；调试与查错也都很方便。用户在购到所需的PLC后，只需按说明书的提示，做少量的接线和简易的用户程序编制工作，就可灵活方便地将PLC应用于生产实践。

可编程序控制器一直在发展中，所以至今尚未对其下最后的定义。国际电工学会（IEC）曾先后于1982.11；1985.1和1987.2发布了可编程序控制器标准草案的第一，二，三稿。

在第三稿中，对PLC作了如下定义：可编程序控制器是一种数字运算操作电子系统，专为在工业环境下应用而设计。它采用了可编程序的存储器，用来在其内部存储执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令，并通过数字的，模拟的输入和输出，控制各种类型的机械或生产过程。可编程序控制器及其有关的外围设备，都应按易于与工业控制系统形成一个整体、易于扩充其功能的原则设计。

定义强调了PLC是：1 数字运算操作的电子系统——也是一种计算机

                  2 专为在工业环境下应用而设计

                  3 面向用户指令——编程方便

                  4 逻辑运算、顺序控制、定时计算和算术操作

                  5 数字量或模拟量输入输出控制

                  6 易与控制系统联成一体

                  7 易于扩充

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ALLEN-BRADLEY MEMORY BOARD 8000-MB / 900052 REV. 6

ALLEN-BRADLEY MEMORY MODULE BOARD 1772-MG

ALLEN-BRADLEY MEMORY MODULE BOARD 1772-MG (AS PICTURED)

Allen-Bradley Memory Module PC Board, # 8000-MB, 900052 Rev E5,

Allen-Bradley Memory Module PC Board, # 8000-MB, 900052-90 03E, "AS IS"

Allen-Bradley Memory Module PC Board, # 8000-MB, 900052-90 03E, "AS IS"

Allen-Bradley Memory PC Board X-361825  #27237

Allen-Bradley Memory PC Board X-361826  #27324

Allen-Bradley Memory PC Board X-361827  #27221

Allen-Bradley Memory PC Board X-361832  #27251

ALLEN-BRADLEY MESSAGEVIEW 421F LED CIRCUIT BOARD SMC-X00 LED 8100149-01 1700148

ALLEN-BRADLEY MODULATOR LOGIC BOARD 50387

ALLEN-BRADLEY MODULATOR LOGIC BOARD 50387-002 FACTORY SEALED 50387002

ALLEN-BRADLEY MODULATOR LOGIC BOARD 50387-002  50387002

Allen-Bradley Modulator Logic Board S50387-002 #42016

ALLEN-BRADLEY MODULATOR LOGIC CIRCUIT BOARD MODULE 50387 REV M

ALLEN-BRADLEY MONITOR CIRCUIT BOARD MODULE 7300-UIB 634174-90 REV 7

ALLEN-BRADLEY MONITOR CIRCUIT BOARD MODULE 7300-UIB 634174-90 REV 6

ALLEN-BRADLEY MONITOR CIRCUIT BOARD MODULE 7300-UIB 634174-90 REV 5

ALLEN-BRADLEY MOO3033704 112273 R05 BOARD PCB  M003033704

Allen-Bradley MOO3100930 M003100930 Circuit Board 106934 R14 -

ALLEN-BRADLEY MOO3270286 133583 REV 07 PC BOARD

ALLEN-BRADLEY MOTHER BOARD 8000GDB

ALLEN-BRADLEY MOTHER BOARD SA3100-SPM01B SER.A REMANUFACTURED

Allen-Bradley Mother Circuit Board 900018 Rev 4 _ 8000-GDB _ 8000GDB PCB 9OOO18

Allen-Bradley Motion Drive Board PC-672-0295 + PC-673-0995 GEB

ALLEN-BRADLEY MULTIPLEXER INTERFACE BOARD 634483-90 REV.-E5

ALLEN-BRADLEY MULTIPLEXER INTERFACE BOARD 634483-9005 REV-5

ALLEN-BRADLEY MULTIPLEXER INTERFACE BOARD 634483C-90

ALLEN-BRADLEY MULTIPLEXER INTERFACE MODULE CONTROL BOARD 634483-90

ALLEN-BRADLEY MULTIPLEXER INTERFACE MODULE CONTROL BOARD 634483-90, REV-E5

Allen-Bradley Nand PC Board X-233164A  #27159

Allen-Bradley NCAB2 Circuit Board -

Allen-Bradley NPC 103C Power Supply Board ! AS IS !

Allen-Bradley Numerical Control Board Module 285068F

ALLEN-BRADLEY OPERATOR DISPLAY BOARD KEYPAD CONTROL 158453 REV. 01

ALLEN-BRADLEY OPERATOR DISPLAY CONTROL BOARD 158453 REV .01

Allen-Bradley Operator Display Control Board A226 120772-8 01 Circuit 158453

Allen-Bradley Operator Display PC Board Control, Mod# 158453,

Allen-Bradley OS 5580 Circuit Board PCB Module OS5580 90105506 9327963S-PC

ALLEN-BRADLEY OSAI A-B OS 5551 BOARD 8600-1726L

Allen-Bradley OSAI OS 5005 R Circuit Board

ALLEN-BRADLEY OSAI OS 5250 AXIS OS-5250 OS5250 BOARD

Allen-Bradley OSAI OS 5651 QB COD 9327769X Circuit Board

Allen-Bradley Ouput Board NOS 459221-0070

ALLEN-BRADLEY OUTPUT AMP SENSING BOARD 50377 REV. B

ALLEN-BRADLEY OUTPUT AMP SENSING CIRCUIT BOARD CARD 50377 REV. 04

ALLEN-BRADLEY OUTPUT AMPS BOARD 50378 REV. 04

ALLEN-BRADLEY OUTPUT CIRCUIT BOARD 7300-UDB 7300UDB 634303B

ALLEN-BRADLEY OUTPUT CIRCUIT BOARD 7300-UDB 7300UDB 634303B-91

ALLEN-BRADLEY OUTPUT GROUND SENSOR BOARD 50385 REV. B

ALLEN-BRADLEY P/N:151161 1336 BD/POWER SUPPLY BOARD 3hp **

Allen-Bradley P-24530 Control board

Allen-Bradley Panel Control Board (PCB6201), Series A, 6420279

Allen-Bradley Panel Control Board W/ Brackets (PCB6201), Series A, 6420279

ALLEN-BRADLEY PANEL INTERFACE MODULE BOARD 635533-9004, REV-4

Allen-Bradley PanelView Communication Board 77145-202-51 F

ALLEN-BRADLEY PANELVIEW CONTROL BOARD ASSEMBLY TRAY 7712920352

ALLEN-BRADLEY PanelView OPERATOR INTERFACE CONTROL BOARD 77129-014-52(C)

ALLEN-BRADLEY PanelView OPERATOR INTERFACE CONTROL BOARD 77129-014-52(E) 20 0482

Allen-Bradley PanelView Plus 400 Display Control Board Keypad Industrial

Allen-Bradley PC Board # 634490 Rev 6

Allen-Bradley PC Board # 8000-AF Clean! 900072

Allen-Bradley PC Board # 8000-GC 900057

Allen-Bradley PC Board / Converter 1720-B2010  #5165

Allen-Bradley PC Board 102509 Scratch & Dent #73309

Allen-Bradley PC Board 102509  #67056

Allen-Bradley PC Board 102509  #67057

Allen-Bradley PC Board 102509  #67058

Allen-Bradley PC Board 102509  #67059

Allen-Bradley PC Board 105060  #59160

ALLEN-BRADLEY PC BOARD 120881, 1336, 3/30 HP

Allen-Bradley PC Board 135655  #55690

Allen-Bradley PC Board 1746HT  #51559

ALLEN-BRADLEY PC BOARD 319624-A01 SER A FRN: V.1007 319624-A01

Allen-Bradley PC Board 42305-052-04  #44482

ALLEN-BRADLEY PC BOARD 634262 rev 11-90

ALLEN-BRADLEY PC BOARD 634384, REV 5

ALLEN-BRADLEY PC BOARD 634488-90, REV. 6 006, UPI

Allen-Bradley PC Board 634490

ALLEN-BRADLEY PC BOARD 634978-9004 REV-4, 634978, VDZ 1

Allen-Bradley PC Board 635532

Allen-Bradley PC Board 635537 REV:2

Allen-Bradley PC Board 77129-012-51 C/L H

Allen-Bradley PC Board 77129-012-51 C/L L

Allen-Bradley PC Board 8000-MDAZ

ALLEN-BRADLEY PC BOARD 8000MDAZ LOT OF 2

Allen-Bradley PC Board 8000-PL