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PLC的發(fā)展歷程1C31125G02

    在工業(yè)生產(chǎn)過程中，大量的開關量順序控制，它按照邏輯條件進行順序動作，并按照邏輯關系進行連鎖保護動作的控制，及大量離散量的數(shù)據(jù)采集。傳統(tǒng)上，這些功能是通過氣動或電氣控制系統(tǒng)來實現(xiàn)的。1968年美GM（通用汽車）公司提出取代繼電氣控制裝置的要求，第二年，美數(shù)字公司研制出了基于集成電路和電子技術的控制裝置，次采用程序化的手段應用于電氣控制，這就是代可編程序控制器，稱Programmable Controller（PC）。

    個人計算機（簡稱PC）發(fā)展起來后，為了方便，也為了反映可編程控制器的功能特點，可編程序控制器定名為Programmable Logic Controller（PLC），現(xiàn)在，仍常常將PLC簡稱PC。

    PLC的定義有許多種。際電工委員會（IEC）對PLC的定義是：可編程控制器是一種數(shù)字運算操作的電子系統(tǒng)，專為在工業(yè)環(huán)境下應用而設計。它采用可編程序的存貯器，用來在其內部存貯執(zhí)行邏輯運算、順序控制、定時、計數(shù)和算術運算等操作的指令，并通過數(shù)字的、模擬的輸入和輸出，控制各種類型的機械或生產(chǎn)過程?？删幊绦蚩刂破骷捌溆嘘P設備，都應按易于與工業(yè)控制系統(tǒng)形成一個整體，易于擴充其功能的原則設計。

    上世紀80年代至90年代中期，是PLC發(fā)展*快的時期，年增長率一直保持為30~40%。在這時期，PLC在處理模擬量能力、數(shù)字運算能力、人機接口能力和網(wǎng)絡能力得到大幅度提高，PLC逐漸進入過程控制領域，在某些應用上取代了在過程控制領域處于統(tǒng)治地位的DCS系統(tǒng)。

    PLC具有通用性強、使用方便、適應面廣、可靠性高、抗干擾能力強、編程簡單等特點。PLC在工業(yè)自動化控制特別是順序控制中的地位，在可預見的將來，是無法取代的。
　 ALLEN BRADLEY AC DRIVE 1336S-BRF75-AA-EN4-L5 SER. E

ALLEN BRADLEY COMBINATION STARTER W/ CIRCUIT BREAKER 513-BDB-6P-41 SER. E *NIB*

RELIANCE ELECTRIC 7.8kW 2000RPM AC SERVO MOTOR 1326AB-B740C-21 *PARTS/REPAIR*

ALLEN BRADLEY 9/440 3-AXIS 10KW SYSTEM MODULE 8520-3S10A-BAT-EX4-Y-2-3-5-7

ALLEN BRADLEY VARIABLE FREQUENCY AC DRIVE 1336S-B007-AA-EN4-GM1-HA2-L6 SER. D

ALLEN BRADLEY 13KVA ADJUSTABLE FREQUENCY AC DRIVE 1336S-B010-AA-EN4-HAP-L6 SER D

ALLEN BRADLEY HI-FLEX 60M MOTOR POWER CABLE 1326-CPB1T-D-060 / 188116 *NEW*

ALLEN BRADLEY CONSTANT TORQUE 3-PHASE AC DRIVE 1336-B003-EOD-FA2-L3 SER. A

ALLEN BRADLEY 50HP VARIABLE SPEED AC DRIVE 1336S-B050-AN-EN4-L6 SER. D *PLASTIC*

ALLEN BRADLEY  * I/O BLOCK  * 1791-8BR SERIES B

ALLEN BRADLEY  * SYSTEM MODULE * 8520-3S10A-BAT-EX4-T1-Y-4

ALLEN BRADLEY PanelView 1400e OPERATOR 2711E-T14C6 SER. C FRN 4.00.00 *DAMAGED#2

ALLEN BRADLEY 9 SERIES CNC OPERATOR INTERFACE PANEL 8520-MTB2 REV 02 *DAMAGED*

ALLEN BRADLEY 9/SERIES MONO INDUSTRIAL MONITOR 8520-MOP7 *DAMAGED #1*

ALLEN BRADLEY OPERATOR INTERFACE 2711E-T14C6 SER. C FRN 4.00.00 *PARTS/REPAIR*

ALLEN BRADLEY 9/SERIES MONO INDUSTRIAL MONITOR 8520-MOP7 *BAD CRT'S*

ALLEN BRADLEY PANELVIEW 1400e TERMINAL 2711E-T14C6 SER. A REV. B FRN. 1.03.00

ALLEN BRADLEY VISION COLOR MONITOR 2801-N8 SER. A *PARTS/REPAIR*

ALLEN BRADLEY OPERATOR INTERFACE 2711-TC1 SER. E FRN 5.00.00 *PARTS/REPAIR*

ALLEN BRADLEY PROCESSOR MASS STORAGE 1770-M11 SER. B

ALLEN BRADLEY DATALINER DISPLAY PANEL 2706-E43J32B1 SER. D *DAMAGE 1*

ALLEN BRADLEY ControlLogix PROCESSOR 1756-L55/A F/W 1.4 W/ 1756-M14/A *REPAIR*

ALLEN BRADLEY PanelView 1400e TERMINAL 2711E-K14C6 SER. A FRN 1.03 *DAMAGED #2*

ALLEN BRADLEY PanelView 1200 TERMINAL 2711-TC4 SER. F FRN 5.11.00 *PARTS/REPAIR*

ALLEN BRADLEY PANELVIEW 900 OPERATOR PANEL 2711-K9A1 SER. F FRN 3.03 *SCREEN #1*

ALLEN BRADLEY  * OPERATOR PANEL 8520-OPS1 /8520-MOP7 * 148705 REV 1

ALLEN BRADLEY DATALINER DISPLAY PANEL 2706-E43J32B1 SER. D *DAMAGE #2*

ALLEN BRADLEY 9/SERIES MONO INDUSTRIAL MONITOR 8520-MOP7 *DAMAGED #2*

ALLEN BRADLEY 9/SERIES MONO INDUSTRIAL MONITOR 8520-MOP7 *DAMAGE #3*

ALLEN BRADLEY DATALINER DISPLAY PANEL 2706-E43J32B1 SER. D *DAMAGE #3*

ALLEN BRADLEY PanelView 1200 TERMINAL 2711-TC1 SER. F *PARTS/REPAIR*

ALLEN BRADLEY OPERATOR INTERFACE 2711-KC1 SER. C FRN 3.01.00 *PARTS/REPAIR*

ALLEN BRADLEY PanelView 1400e OPERATOR INTERFACE 2711E-K14C6 SER. G *CONTROLLER*

ALLEN BRADLEY PanelView 1200 TERMINAL 2711-TC4 SER. F FRN 5.13.01 *PARTS/REPAIR*

ALLEN BRADLEY POWERFLEX 40 SERIES A AC DRIVE 22B-D017N104 *FOR PARTS or REPAIR*

ALLEN BRADLEY DC SERVO DRIVE CONTROLLER 1388B-AV10 SER. B *NO TOP BOARD*

ALLEN BRADLEY OPERATOR INTERFACE 6180-DHIEFLDHECZ SER. B *PARTS/REPAIR*

ALLEN BRADLEY PanelView 1200 TERMINAL 2711-TC1X SER F FRN 5.12.00 *PARTS/REPAIR*

ALLEN BRADLEY PANELVIEW 900 INTERFACE PANEL 2711-K9A1 SER. D FRN 2.02 *DAMAGE 1*

ALLEN BRADLEY OPERATOR INTERFACE 2711-TC1 SER. C FRN 3.00.00 *PARTS/REPAIR*

ALLEN BRADLEY  FLAT PANEL MONITOR *PARTS AND REPAIR* 6185-CACAAAZ SER A

ALLEN BRADLEY 9/SERIES OPERATOR INTERFACE 8520-VOP REV. 04 *PARTS/REPAIR*

ALLEN BRADLEY 1305 4.0kW/5HP VAR FREQ DRIVE 1305-BA09A-HA2 SER B *PARTS/REPAIR*

ALLEN BRADLEY PANELVIEW 1400e OPERATOR INTERFACE 2711E-T14C6 *PARTS or REPAIR*

ALLEN BRADLEY DATALINER DISPLAY PANEL 2706-B23J8 SER. G REV. C *PARTS/REPAIR*

ALLEN BRADLEY PanelView 1200 OPERATOR INTERFACE 2711-TC1MC SER. F *PARTS/REPAIR*

ALLEN BRADLEY Panelview TERMINAL 2711-TC1 SER. E FRN 5.02.00 *PARTS/REPAIR*

ALLEN BRADLEY Panelview TERMINAL 2711-TC4 SER. E FRN 5.02.00 *PARTS/REPAIR*

ALLEN BRADLEY SMC PLUS 208-480V 35A MOTOR CONTROLLER, 150-A35NBDA-8L4 SER. B

ALLEN BRADLEY PanelView 1200 TERMINAL 2711-TC1X SER E FRN 5.02.00 *PARTS/REPAIR*

ALLEN BRADLEY PanelView 900 OPERATOR PANEL 2711-T9C1 SER. A FRN 2.03 *DAMAGE #2*

ALLEN BRADLEY PANELVIEW 550 OPERATOR PANEL 2711-B5A1 SER. F FRN 4.20 *DAMAGE #1*

ALLEN BRADLEY 1400e OPERATOR INTERFACE 2711E-K14C6X SER. E *PARTS/REPAIR*

ALLEN BRADLEY PANELVIEW 550 OPERATOR PANEL 2711-B5A1 SER. E FRN 4.20 *DAMAGE #2*

ALLEN BRADLEY TOP BOARD ASSEMBLY FOR 1336 AC DRIVE 135355 RV.03 *PARTS/REPAIR*

ALLEN BRADLEY PanelView 1400e OPERATOR INTERFACE 2711E-K14C6 SER D *PARTS/REPAIR

ALLEN BRADLEY 15KW AC SERVO DRIVE CONTROLLER 1394-AM75 SER. A *DAMAGED #1*

ALLEN BRADLEY 9/SERIES MONO INDUSTRIAL MONITOR 8520-MOP7 *DAMAGE #4*

ALLEN BRADLEY 1394 AC SERVO CONTROLLER AXIS MODULE 15KW 1394-AM75 SER.A PLASTIC

ALLEN BRADLEY VERSAVIEW 700R INDUSTRIAL PC 6155R-7PXPH PARTS/REPAIR

ALLEN BRADLEY OPERATOR INTERFACE DISPLAY 6156-AAZAAZAZAZ SER. A *PARTS/REPAIR*

ALLEN BRADLEY PANELVIEW 900 OPERATOR PANEL 2711-T9C1 SER A FRN 2.01 *DAMAGED #3*

ALLEN BRADLEY  OP. MONITOR SER.A E20FPC / E136709 / 6157-BABAAZAAZZ

ALLEN BRADLEY 5KW AC SERVO CONTROLLER AXIS MODULE 1394-AM07 SER. A *DAMAGED #1*

ALLEN BRADLEY OPERATOR INTERFACE INDUSTRIAL COMPUTER 6153-KHADFFCZCDZ

ALLEN BRADLEY 1336S-BRF20-AA-EN-HAP-L6 ADJ FREQUENCY AC DRIVE *PARTS ONLY*

ALLEN BRADLEY  POWERFLEX 70 AC SERVODRIVE SER.A 20AC022A0AYNANC0

ALLEN BRADLEY VersaView 750R INDUSTRIAL COMPUTER 6177R-M4PXP SER A *FOR REPAIR

ALLEN BRADLEY OPERATOR INTERFACE 2711-T10C15 SER. B FRN 3.40 *DAMAGED #1*

ALLEN BRADLEY OPERATOR INTERFACE DISPLAY 6185-CACAAAA SER. A *PARTS/REPAIR*

ALLEN BRADLEY INDUSTRIAL COMPUTER 6155-RNYHJLCZGFZ SER. B *PARTS/REPAIR*

ALLEN BRADLEY Panelview 1200 TERMINAL INTERFACE 2711-TC1MC SER. G *PARTS/REPAIR*

ALLEN BRADLEY  PROCESSOR MODULE BOARD REV.01 8520CPUX / 90781001

ALLEN BRADLEY VersaView 1550m DISPLAY 6176M-15PN SER. A *PARTS or REPAIR*

ALLEN BRADLEY 3X200/460VAC/50-60HZ INPUT RFI FILTER 1336-RFB-80-C *CUT CABLES*

ALLEN BRADLEY PANELVIEW 900 OPERATOR PANEL 2711-K9A1 SER. F FRN 3.03 *DAMAGE #1*

ALLEN BRADLEY OPERATOR INTERFACE 6182-AGAZZC SER. A *DAMAGED #3*

ALLEN BRADLEY E20DPA OPERATOR INTERFACE PANEL 6157-AABAAZAAZZ, PARTS/REPAIR

ALLEN BRADLEY TOUCH SCREEN OPERATOR INTERFACE 6180-ELMEHNDIECZ *PARTS/REPAIR*

ALLEN BRADLEY INC-121 1 AXIS SERVO CONTROLLER SER. A FW 03.00/1.22

ALLEN BRADLEY PANELVIEW 550 OPERATOR PANEL 2711-B5A1 SER. E FRN 2.01 *DAMAGE #1*

ALLEN BRADLEY PANELVIEW 600 OPERATOR PANEL 2711-K6C2 SER A REV B FRN 3.01 REPAIR

ALLEN BRADLEY REMOTE I/O MODULE 8520-RIOM 156755 REV. 02 *PARTS/REPAIR*

ALLEN BRADLEY 9/SERIES COLOR OPERATOR PANEL 8520-VOP1 REV. 1 *PARTS/REPAIR*

ALLEN BRADLEY VersaView 1500P INTEGRATED COMPUTER 6181P-15NS2KH SER. A *P/R #2*

ALLEN BRADLEY OPERATOR INTERFACE 6153-EEACEDAZBBZ WS3006 *FOR PARTS or REPAIR*

ALLEN BRADLEY OPERATOR INTERFACE 6182-AGAZZC SER. A *DAMAGED #1*

ALLEN BRADLEY 10KW SYSTEM MODULE 1394-SJT10-E SER. A FRN V1.01 *TOP BOARD/LABEL*

ALLEN BRADLEY 20HP VARIABLE SPEED AC DRIVE 1336-B020-EOE-L1 SER A *PARTS/REPAIR*

ALLEN BRADLEY 9/440 HIGH RESOLUTION 10KW MODULE 8520-HR10-A1-A2-A...*DAMAGED #2*

ALLEN BRADLEY PanelView 1400e TERMINAL 2711E-K14C6 SER. B FRN 2.002.00 *BAD CRT*

ALLEN BRADLEY 2.5KW AC SERVO MOTOR F-4050-Q-H04AA SER. A / 193495 *PARTS/REPAIR*

ALLEN BRADLEY OPERATOR INTERFACE 6182-AGAZZC SER. A *DAMAGED #2*

RELIANCE ELECTRIC ELECTRO-CRAFT AC SERVO MOTOR 1326AB-B720E-21C *PAINTED PINS*

ALLEN BRADLEY PANELVIEW 900 OPERATOR PANEL 2711-T9C1 SER. A FRN 2.01 *DAMAGE #1*

ALLEN BRADLEY 15KW/20HP DC DRIVE 1395-B69-C1-P12 SER. B *FOR PARTS/REPAIR* #2

ALLEN BRADLEY 1326 AC SERVO MOTOR 1326AS-B840C-21 *PAINTED PINS*

ALLEN BRADLEY 15KW/20HP DC DRIVE 1395-B69-C1-P12 SER. B *FOR PARTS/REPAIR* #1

ALLEN BRADLEY 8510 AC SPINDLE DRIVE 8510A-A22-A2 *PARTS or REPAIR, NO TOP BOARD*

ALLEN BRADLEY 9/SERIES COLOR OPERATOR PANEL 8520-VOP1 REV. 01 *DAMAGED #2*

SKF M30X1.5 LOCKNUT, KMTA 6, NIB

TIMKEN TAPERED ROLLER BEARING NIB 33821

68-1/2" LINEAR RAIL W/ 2 HSR25 BLOCK

THOMSON SUPER PILLOW BLOCK, TWN-20-OPN *NEW*

INA 32MM OD, 24MM ID, 20MM W NEEDLE ROLLER BEARING NK24/20 *NEW*

NEW DEPARTURE  ROLLER BEARING 5307 / 5607

SEAL MASTER BALL BEARING PILLOW BLOCK NP-208 *NEW*

NSK 14-1/8" LINEAR GUIDE RAIL W/ 2 BEARING BLOCKS LH35 NNB

FAFNIR .09 ID 1.1 OD BALL BEARING W204PP *NEW*

SKF UNIVERSAL JOINT 1-0170

HFH 1-3/16 BORE 2-BOLT MOUNTED PILLOW BLOCK BEARING HOUSING, SAF 507

INA THRUST BEARING D9 NIB

REXROTH LINEAR BUSHING  7210

AMERICAN SOLVING INC. 2500kg 3.0BAR AIR BEARING  SE15-2.5

PACIFIC BEARING CO 3/8"I.D, 7/8"O.D LINEAR BEARING FLC16 NIB

SEALMASTER BEARING  ER-28

TORRINGTON / FAFNIR MM206K SUPER PRECISION BEARING, NIB

FAG 17mm ANGULAR CONTACT RADIAL BEARING 7203B.TVP.UO *NEW*

INA 1-1/4" BORE, PILLOW BLOCK BEARING RAK1-1/4

THOMSON 30MM BORE, SUPER SMART PILLOW BLOCK SSEPBM 30 DD

SKF BEARING 6006 RSR

INA NEEDLE BEARING HF2520 NIB

MB MFG 1 INCH I.D, 7/8 INCH, MOUNTED FLANGE BEARING 3797901

MCGILL CAMYOKE ROLLER CYR 2 1/2 S NIB LOT OF 2

FAFNIR BALL BEARINGS RA103NPPB-2

PRECISION 1.5"OD, 0.4"ID BEARING 7203 BG *NEW*

NSK LINEAR BEARING BLOCK W/ RAIL, LH200160ANC1-P6Z1, NNB

BARDEN 209HCDUM O-11 SUPER PRECISION BEARING ? SET, NIB

THK SC30UU LM CASE UNIT NIB

ATLAS COPCO SERVICE KIT 4081-0124-90 *NEW,SEALED*

SKF 1" ID X 2"OD X 1/2" WIDE BEARING  6205 2RSJEM NIB

UNKNOWN MFG BEARING 5507

SCHNEEBERGER SIZE 45 MONORAIL CARRIAGE ROLLER BEARING, MR-45 *NEW*

SEALMASTER GOLD LINE 1" SHAFT DIA. SET SCREW BEARING, ER-16 *NEW*

TIMKEN TAPERED ROLLER BEARING 563-B NIB

NSK 20-7/16" LINEAR GUIDE RAIL W/ 2 BEARING BLOCKS LH20 NNB

TIMKEN NATIONAL SEALS, 415254, NIB LOT OF 2

IKO 49-9/16" LINEAR GUIDE RAIL W/ 2 BEARING BLOCKS LWES35 NNB

INA DOUBLE ROW BEARING 51124J NIB

DRILL BEARING KIT  250-20873

SKF, BEARING 6318 J/EM NEW IN BOX

SKF BEARING NIB 2NU12-NU212

MCGILL 1.5IN. OD 1IN. ID NEEDLE ROLLER BEARING MR 16 SRS *NEW IN BOX*

TIMKEN 35MM I.D. 72MM O.D. TAPERED ROLLER BEARING, 33207-92KA1 *NEW*

INA ROLLER BEARINGS 602-2Z/ 954420 *NEW IN BOX, LOT OF 6*

TORRINGTON ROLLER BEARINGS B-1212

SKR  BEARING SKR 120

SKF 1-3/16" BORE. 2-BOLT MOUNTED PILLOW BLOCK BEARING HOUSING, SAF 507 *NEW*