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PLC實質上是一種工業(yè)控制計算機，PLC與計算機的組成十分相似。只不過它比一般的計算機具有更強的與工業(yè)過程相連接的接口，以及更直接的適應控制要求的編程語言。從硬件結構看，它由CPU、存儲器、輸入/輸出接口、電源等組成。PLC的基本組成框圖如圖1所示。下面對PLC控制系統(tǒng)的主要硬件部分進行介紹。

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鄭娟萍

廈門仲鑫航自動化設備有限公司

  1）、*處理器（CPU）
    一般由控制器、運算器和寄存器組成，這些電路都集成在一個芯片內。CPU通過數據總線、地址總線和控制總線與存儲單元、輸入/輸出接口電路相連接。
    與一般的計算機一樣，CPU是整個PLC的控制中樞，它按PLC中系統(tǒng)程序賦予的功能指揮PLC有條不紊的進行工作。CPU主要完成下述工作：
    （1）接收、存儲用戶通過編程器等輸入設備輸入的程序和數據。
    （2）用掃描的方式通過I/O部件接收現場信號的狀態(tài)或數據，并存入輸入映像寄存器或數據存儲器中。
    （3）診斷PLC內部電路的工作故障和編程中的語法錯誤等。
    （4） PLC進入運行狀態(tài)后，執(zhí)行用戶程序，完成各種數據的處理、傳輸和存儲相應的內部控制信號，以完成用戶指令規(guī)定的各種操作。
    （5）響應各種外圍設備(如編程器、打印機等）的請求。
    PLC采用的CPU隨機型不同而不同， 目前，小型PLC為單CPU系統(tǒng)，中型及大型則采用雙CPU甚至多CPU系統(tǒng)。目前，PLC通常采用的微處理器有三種：通用微處理器、單片微處理器（即單片機）、位片式微處理器。
    2）、 存儲器
    PLC系統(tǒng)中的存儲器主要用于存放系統(tǒng)程序、用戶程序和工作狀態(tài)數據。PLC的存儲器包括系統(tǒng)存儲器和用戶存儲器。
    （1）系統(tǒng)存儲器
    系統(tǒng)存儲器用來存放由PLC生產廠家編寫的系統(tǒng)程序，并固化在ROM內，用戶不能更改。它使PLC具有基本的功能，能夠完成PLC設計者規(guī)定的各項工作。系統(tǒng)程序質量的好壞很大程度上決定了PLC的性能。
    （2）用戶存儲器
    用戶存儲器包括用戶程序存儲器（程序區(qū)）和數據存儲器（數據區(qū)）兩部分。用戶程序存儲器用來存放用戶針對具體控制任務采用PLC編程語言編寫的各種用戶程序。用戶程序存儲器根據所選用的存儲器單元類型的不同（可以是RAM、EPROM或EEPROM存儲器），其內容可以由用戶修改或增刪。用戶數據存儲器可以用來存放（記憶）用戶程序中所使用器件的ON/OFF狀態(tài)和數據等。用戶存儲器的大小關系到用戶程序容量的大小，是反映PLC性能的重要指標之一。

SPC TECHNOLOGY SPC4378 TENMA TEST JACK 36AN 5000V (LOT OF 12) ***NIB***

TRIPP-LITE P944-06I ATA POWER CABLE 6IN 15CM 6 PULGADAS (LOT OF 5)  *NIB*

CORNELL 947C731K801CDMS CAPACITOR 730 UF 800VDC 55 DEG C  **NNB**

NKK SWITCHES M2018SS1W01 SWITCH TOGGLE SPDT 6A 250VAC (LOT OF 3) **NIB**

CELDUC 1LK00700 SOILD STATE RELAY HIGH CURRENT KIT TYPE POWER CONNECTIONS *NIB*

DELPHI 25764116 GM OEM FRONT AIRBAG SENSOR CADILLAC DEVILLE **NIB**

OHMITE 605HR030E RESISTOR CUR SENSE 500MW 0.030HM 3% (LOT OF 36) **NIB**

MULTICOMP MST T2.5A 250V FUSE SLOW BLOW 8.335MM (LOT OF 5) **NNB**

NTE ELECTRONICS R14-11A10-12 POWER RELAY 12VAC 10A PLUG IN (LOT OF 2) **NIB**

COOPER BUSSMAN S505-6.3-R 6.3A 250VAC 20MM TIME DELAY BUSS FUSS(LOT OF 10) *NIB*

VISHAY RH02540R00FC02 DALE RH-25 25W RESISTOR 1% C02 (LOT OF 5) **NIB**

EATON/CUTLER HAMMER C320KG4 CONTACTOR AUXILIARY CONTACT 15-75A**NIB**

HARWIN M30-6100346 PLUG 1.25MM PCB 3WAY CONNECTOR  (LOT OF 25) **NIB**

HARWIN M22-6340542 RECEPTACLE CONTACT TERMINATION 10WAY 2ROW (LOT OF 23) *NIB*

 MOLEX 39521-1012 PIN HEADER TERMINAL BLOCK 0.197 12POS (LOT OF 10) *NIB*

 MARATHON 600GP05PSB CONNECTOR TYPEBARRIER TERMINAL BLOCK 9.5M (LOT OF 6) *NIB*

MULTICOMP MCGPR50V106M5X11 CAPACITOR ALUM ELEC 10UF 50V 20% (LOT OF 260) **NIB**

1998-2005 ALL GM MODELS 10326150 LEFT SIDE SENSOR **NIB**

WAKEFIELD SOLUTIONS 233-60AB THERMAL RESISTANCE 58 C (LOT OF 45) ***NIB***

SPC SPC15122 INSULATED TIP PLUG CONNECTOR TYPE TIP (LOT OF 11)  ***NIB***

OHMITE S505-8-R BUSS FUSS ***NIB***

2005 ALL GM MODELS 10354930 RIGHT SIDE SENSOR **NIB**

OHMITE 0D435JE RESISTOR ELEMENTCARBON, 4.3MOHM 25 3MOHM (LOT OF 55) *NIB*

UNITED CHEMI-CON EMVK6R3ADA331MHA0G 6.3V 105C 10M 6.3V (LOT OF 97) *NIB*

AMPHENOL TUCHEL T-3507-000 CIRCULAR CONNECTOR RECEPTACLE SOCKET (LOT OF 2) *NIB*

SCHAFFNER RN143-2-02  CURRENT-COMPENSATED CHOKES (LOT OF 7) ***NIB***

MOLEX 51005-0500 WIRE TO WIRE CONNECTOR (LOT OF 111) *NIB*

MOLEX 19154-0041 INSULATED BUTT CONNECTOR  SPLICE 8 AWG (LOT OF 76) **NIB**

DELPHI 25765111 GM OEM AIRBAG SENSOR 2000-2005 PONTIAC BONNEVILLE **NIB**

MOLEX 26-61-4090 WIRE-BOARD CONNECTOR HEADER 9POS, 3.96MM (LOT OF 55) *NIB*

DELPHI 15077445 GM OEM AIRBAG SENSOR 2002-2009 ENVOY/TRAILBLAZER **NIB**

DELPHI 10369566 GM OEM FRONT AIRBAG SENSOR 2006-2007 BUICK RAINIER/GMC ENVOY*NIB

DELPHI 15254201 GM OEM AIRBAG SENSOR 2006-2007 HUMMER H3 FRONT **NIB**

MULTICOMP P6KE24A-RH CLAMPING VOLTAGE 22.8V TO 25.2V (LOT OF 42) **NIB**

MULTICOMP 62S020S-30ANE-B DISPLAY PORT CONNECTOR RECEP 20POS (LOT OF 9) *NIB*

RADIALL LARSEN R142A306500 STRAIGHT BULKHEAD JACK 75OHM CRIMP (LOT OF 13)  *NIB*

PERICOM PI6C21200VE CLOCK DRIVER, 500MHZ (LOT OF 2) ***NIB***

ATMEL ATMEGA88PV-10AU 8-BIT MCU 8K FLA ***NIB***

ATMEL ATMEGA16A-AU 8BIT MCU, 16MHZ ***NIB***

TEXAS INSTRUMENTS TLV2462IDGK 6.4MHZ SUPPLY VOLTAGE RANGE 1.35V (LOT OF 14)*NIB*

EXAR SP3483EN-L RS-485 TRANSCEIVER 3.6V (LOT OF 5)  ***NIB***

ZENER DIODE BZX55C20 FAIRCHILD SEMICONDUCTOR 20V 500MW (LOT OF 705) *NIB*

BI TECH 64XR2KLF TECHNOLOGIES/TT ELECTRONICS 2KOHM 20TURN THD (LOT OF 22) *NIB*

SCP PIC16LF2-I/S0 1028WTS MICROCHIP 20MHZ 8 BIT (LOT OF 6) **NIB**

MOLEX PCD-00173-0K ETHERNET CABLE (LOT OF 2) **NNB**

MULTICOMB M90-3102R10SL-3P CIRCULAR CONNECTOR 88M9713  (LOT OF 3) **NIB**

STM M74HCT138B1R 3 TO 8 INVERTING DECODER 16 PIN DIP(LOT OF 61) *NIB*

 FESTO ELECTRIC ADVU-80-25-A-P-A PMAX=10BAR/145PSI  **NNB**

MOLEX 76650-0065 .062" SERIES 4 CIRCUIT 5AMP 250V (LOT OF 2) **NIB**

MICROCHIP LTC1482CS8#PBF LINEAR TECHNOLOGY 5V IC INTERFACE (LOT OF 3) *NIB*

MICROCHIP 25LC080B-I/SN IC EEPROM 8KBIT SERIAL 10MHZ 8KBIT (LOT OF 15) *NIB*

MULTICOMP MC0603B331M101CT 330PF 100V 20% CAPACITOR CERAMIC (LOT OF 4000) *NIB*

WELWYN MFP2-18RJI RESISTOR  METAL FILM 18 OHM 2W 5% (LOT OF 339) **NIB**

CYPRESS SEMI CY8CLED04-68LFXI 660934PROGRAM MEMORY1K RESOLUTION(LOT OF 3)  *NIB*

MOLEX 19164-0029 TERMINALS SPADE TNG STUD 8 14-16 AWG (LOT OF 100) *NIB*

MULTICOMP MC0402F473Z160CT .047UF CAPACITOR CERAMIC (LOT OF 10000) *NIB 

OHMITE OF361JE RESISTOR, CARBON, 360OHM, 500MW (LOT OF 38)  **NIB**

MUELLER ELECTRIC BU-63-0 / BU-63-2 CLIP & INSULATOR (LOT OF 10) PAIR ***XLNT***

VISHAY IRFI620GPBF N CH MOSFET, 200V, 4.1A, TO-220FP (LOT OF 555) **NIB**

ANALOG AD9742ARUZ DAC, 12BIT, 210MSPS, TSSOP-28; RESOLUTION *NIB*

MOLEX 43045-0503 PLUS AND SOCKET CONNECTOR MICRO FIT 3.0 (LOT OF 197) **(NIB)**

MICROCHIP TECH PIC24HJ128GP502-I/SO 16-BIT MICROCONTROLLERS (LOT OF 2) *NIB*

TEXAS INSTRUMENTS TPA3101D2  89T ACRN AUDIO AMPLIFIERS (LOT OF 2)  ***NIB***

MOLEX 14-56-2165 CONNECTOR, RECEPTACLE, 16POS, IDC (LOT OF 107) **NIB**

MOLEX 19070-0133 CONNECTOR RING TERMINAL 1/4" 10-12AWG (LOT OF 500) *NIB*

MOLEX 19001-0005 TERMINAL, MALE DISCONNECT 0.187IN RED TAPED  (LOT OF 500) *NIB*

MOLEX 19073-0010 TERMINAL; CONNECTOR TYPE:RING TONGUE CRIMP (LOT OF 1000) *NIB*

MOLEX 19073-0019 TERMINAL, RING TONGUE #10 CRIMP RED (LOT OF 928) *NIB*

MOLEX 19-09-1096 PLUG & SOCKET HOUSING, RECEPTACLE NYLON (LOT OF 272) ***NIB***

MOLEX 38002-1352 JUMPER TERMINAL SLOT NI (LOT OF 1000) ***NIB***

GC 19-2092 CONDUCTIVE EPOXY SYRINGE KIT 6G LEAD FREE ROHS COMPLIANTS ***NIB***

MOLEX 39-01-4052 CONNECTOR HOUSING PLUG AND SOCKET (LOT OF 371) ***NIB***

MOLEX 76650-0221 NANO-CHANGE CONNECTOR KIT 3 CIRCUITS 4 AMPS 60V/75V ***NIB***

MOLEX 19-09-1096 PLUG & SOCKET HOUSING, RECEPTACLE NYLON (LOT OF 200) ***NIB***

MOLEX 53048-0610 WIRE-BOARD CONNECTOR HEADER 6POS 1.25MM (LOT OF 100)  ***NIB***

MOLEX E-357-38T RING VERSA DOUBLE CRIMP TAPED (LOT OF 142) *NIB*

MOLEX 76650-0200 IGRID CONNECTOR KIT 28 CIRCUIT 2 AMPS 250V ***NIB***

IFM IFS204 SWITCH LEN-INDUCTIVE CAB01D06 (MISSING NUT) **NNB**

MOLEX 19003-0049 TERMINAL FEMALE DISCONNECT 0.25IN BLUE (LOT OF 525) **NIB**

IFM IFS204 SWITCH LEN-INDUCTIVE CAB01D06 **NNB**

MOLEX 19154-0041 INSULATED BUTT CONNECTOR  SPLICE 8 AWG (LOT OF 101) **NNB**

MOLEX 82-28-6161 2.54MM PITCH ROUND CONDUCTOR FLAT CABLE - 28 AWG *NIB*

MOLEX 19003-0010 TERMINALS FEMALE TERM 18-22AWG (LOT OF 615) **NIB**

BCS-012-NS-1-Y-02  4.02 30VDC 200MA 4MM NPN N/O **XLT**

MOLEX  AA-820-06T DESC AVIKRIMP TAPED 22AWG (LOT OF 1500) **NIB**

SAMTEC SFML-125-T2-S-D BOARD-BOARD CONN, SOCKET, 50WAY, 2ROW (LOT OF 2) *NIB 

DAMAN DD03TPPT4B 0706 HYDRAULIC TAPPING PLATE  **NNB**

DAYLIGHT 591-2701-002F INDICATOR, LED PCB, 3MM (LOT OF 20) *NIB* 

DAMAN DD03TPAB4B 0110 HYDRAULIC TAPPING PLATE  **NNB**

BUD INDUSTRIES PB-1576 POTTING BOX H11  ***NIB***