可編程序控制器，英文稱Programmable Controller，簡稱PC。但由于PC容易和個人計算機（Personal Computer）混淆，故人們仍習慣地用PLC作為可編程序控制器的縮寫。它是一個以微處理器為核心的數字運算操作的電子系統裝置，專為在工業現場應用而設計，它采用可編程序的存儲器，用以在其內部存儲執行邏輯運算、順序控制、定時/計數和算術運算等操作指令，并通過數字式或模擬式的輸入、輸出接口，控制各種類型的機械或生產過程。PLC是微機技術與傳統的繼電接觸控制技術相結合的產物，它克服了繼電接觸控制系統中的機械觸點的接線復雜、可靠性低、功耗高、通用性和靈活性差的缺點，充分利用了微處理器的優點，又照顧到現場電氣操作維修人員的技能與習慣，特別是PLC的程序編制，不需要專門的計算機編程語言知識，而是采用了一套以繼電器梯形圖為基礎的簡單指令形式，使用戶程序編制形象、直觀、方便易學；調試與查錯也都很方便。用戶在購到所需的PLC后，只需按說明書的提示，做少量的接線和簡易的用戶程序編制工作，就可靈活方便地將PLC應用于生產實踐。

ALLEN-BRADLEY 12M03-00165-00 , FILED CONTROL CIRCUIT BOARD

ALLEN-BRADLEY 12M03-00165-00 PC BOARD 12M030016500

ALLEN-BRADLEY 12M03-00180-00 , PC BALANCE DETECTOR CIRCUIT BOARD

Allen-Bradley 12M03-00180-00 T10-9721 PCB board

ALLEN-BRADLEY 12M03-00193-01 , FIELD VOLTAGE CIRCUIT BOARD

ALLEN-BRADLEY 12M03-00194-01 , SPEED LAG CIRCUIT BOARD

ALLEN-BRADLEY 12M03-00194-01 CONTROL BOARD SPEED/LAG/FIELD LOSS  CONDITION

ALLEN-BRADLEY 12M03-00194-01* , SPEED LAG CIRCUIT BOARD

ALLEN-BRADLEY 12M03-00221-00 PC BOARD 12M030022100

Allen-Bradley 12M09-00001-01 103355 Rev 02 PC BOARD POWER CONTROL

ALLEN-BRADLEY 12M09-00013-00 PC BOARD

ALLEN-BRADLEY 12M09-00014-00 CONTROL PC BOARD

ALLEN-BRADLEY 1332 AC DRIVE CONTROL BOARD VF-4 CONTROL-7-B

ALLEN-BRADLEY 133237 Rev 13 DRIVE BASE POWER SUPPLY BOARD,

Allen-Bradley 1334 Mod-N4 Circuit Board

Allen-Bradley 1334 S50403 Driver Circuit Board 1334-S50403 **

Allen-Bradley 1334 VFD Driver Power Supply Board 50406

Allen-Bradley 1334-50387 logic board modulator

ALLEN-BRADLEY 1334-50387-002 REVISION 02 , MODULATOR BOARD/LOGIC #221140

Allen-Bradley 1334-50406 Driver Power Supply Board 133450406 AB PCB PLC PS

Allen-Bradley 1334-MOD-C2 Frequency Output Board

ALLEN-BRADLEY 1334-MOD-J DRIVE BOARD ASSEMBLY 89209-001 J REVERSING SURPLUS*

ALLEN-BRADLEY 1334-MOD-N4 REVISION 03 PC BOARD MODULE ISOLATED SIGNAL, N #149852

Allen-Bradley 133517 Power Drive Board, Rev 02 (AS-IS. Unable to Test)

Allen-Bradley 133539 Circuit Board -

ALLEN-BRADLEY 133539 REV 02  IGBT POWER BOARD 133539

ALLEN-BRADLEY 133583 CONTROL BOARD ASSEMBLY * IBN BOX*

ALLEN-BRADLEY 133583 REV. 09, 133598 REV. 08 DRIVE CONTROL BOARD

ALLEN-BRADLEY 133583, 133598, 133588 DRIVE CONTROL BOARD

Allen-Bradley 1336 1336vt remote programming control panel display board

ALLEN-BRADLEY 1336 AC DRIVE 120659 DRIVE BOARD 120663 DISPLAY 120673 INTERFACE

Allen-Bradley 1336 AC VS Drive Control PLC Board Assembly 1336-B100 AB 148363

ALLEN-BRADLEY 1336 CIRCUIT BOARD

ALLEN-BRADLEY 1336 DRIVE 115VAC LOGIC INTERFACE BOARD 1336-L6

ALLEN-BRADLEY 1336 DRIVE DISPLAY BOARD 155736 REV 01

ALLEN-BRADLEY 1336 DRIVE DISPLAY DRIVER BOARD 155739

ALLEN-BRADLEY 1336 DRIVE DISPLAY INTERFACE BOARD 133401 133400-01 REV 04

Allen-Bradley 1336 Drive Display With 133401 Rev 04 Board

ALLEN-BRADLEY 1336 DRIVE KEYPAD BOARD 120663 120771

ALLEN-BRADLEY 1336 DRIVE POWER SUPPLY BOARD 151157 / 151108 REV 03

ALLEN-BRADLEY 1336 KIT PCB MAIN CONTROL DRIVE BOARD # 140140 MAKE OFFER!

ALLEN-BRADLEY 1336 MAIN CONTROL BOARD KIT SP-120659

ALLEN-BRADLEY 1336/1336VT DRIVER BOARD 151135 15HP DRIVES

ALLEN-BRADLEY 1336/1336VT DRIVER BOARD 151137 25HP DRIVE