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產(chǎn)品精品  價(jià)格百年一遇1756-OX8I
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PLC的發(fā)展歷程

    在工業(yè)生產(chǎn)過程中，大量的開關(guān)量順序控制，它按照邏輯條件進(jìn)行順序動(dòng)作，并按照邏輯關(guān)系進(jìn)行連鎖保護(hù)動(dòng)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(dòng)或電氣控制系統(tǒng)來實(shí)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(shù)的控制裝置，次采用程序化的手段應(yīng)用于電氣控制，這就是代可編程序控制器，稱Programmable Controller（PC）。

    個(gè)人計(jì)算機(jī)（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(diǎn)，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(yùn)算操作的電子系統(tǒng)，專為在工業(yè)環(huán)境下應(yīng)用而設(shè)計(jì)。它采用可編程序的存貯器，用來在其內(nèi)部存貯執(zhí)行邏輯運(yùn)算、順序控制、定時(shí)、計(jì)數(shù)和算術(shù)運(yùn)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(jī)械或生產(chǎn)過程?？删幊绦蚩刂破骷捌溆嘘P(guān)設(shè)備，都應(yīng)按易于與工業(yè)控制系統(tǒng)形成一個(gè)整體，易于擴(kuò)充其功能的原則設(shè)計(jì)。

    上世紀(jì)80年代至90年代中期，是PLC發(fā)展*快的時(shí)期，年增長率一直保持為30~40%。在這時(shí)期，PLC在處理模擬量能力、數(shù)字運(yùn)算能力、人機(jī)接口能力和網(wǎng)絡(luò)能力得到大幅度提高，PLC逐漸進(jìn)入過程控制領(lǐng)域，在某些應(yīng)用上取代了在過程控制領(lǐng)域處于統(tǒng)治地位的DCS系統(tǒng)。
1756-OX8I
    PLC具有通用性強(qiáng)、使用方便、適應(yīng)面廣、可靠性高、抗干擾能力強(qiáng)、編程簡單等特點(diǎn)。PLC在工業(yè)自動(dòng)化控制特別是順序控制中的地位，在可預(yù)見的將來，是無法取代的。
CONSOLIDATED 18MM ID, 25MM OD, 22MM W, NEEDLE ROLLER BEARING CJ K-18X25X22 *NEW*

STAR PILLOW BLOCK BEARING, 1591-1-3000 *NIB*

FAFNIR SUPER PRECISION BEARING 3MM9107WI DUM NIB

BARDEN PRECISION BEARING 104HCUL NNB

SKF * SINGLE ROW BALL BEARING LOT OF 2 NIB * 6002-2RS1

FEDERAL MOGUL FLANGE BEARING NIB 40-MST

SKF * OIL SEAL NIB * 14863

SKF * OIL SEAL NIB * 17142

SKF * OIL SEAL NIB * 18965

SKF * OIL SEAL NIB * 13650

MRC BEARING NIB 5207MFFG

SKF * OIL SEAL NIB * 13529

MRC 47MM OD, 20MM ID DOUBLE-ROW ANGULAR CONTACT BALL BEARING 5204CFF *NEW*

INA 4 PIECES BEARING LR5304-2RS NIB

NTN * BALL BEARING NIB * 63/22LLU/2AS

GATES 1-1/2", 1610 BUSHING 78581708 *NEW*

TIMKEN BEARING 56650 3 *NEW IN BOX*

HEIM OPN-1250 UNILIN LINEAR BEARING, NIB

FAG ROLLER BEARING,  K72212C, NIB

SNR 32207C ROLLING BEARING , SEALED, NIB

SKF BEARING 21310 E/C-3 SEALED

MCGILL * CAM FOLLOWER NIB * MT0E3

FAFNIR BALL BEARING S1KDD7 NIB

SNR ADAPTER NIB SNW-15X2-7/16

TIMKEN 3-1/2" OD 2"ID TAPERED ROLLER BEARING 45285 *NEW*

DODGE 1-1/2" SHAFT DIA. PILOTED FLANGE BEARING, FCSCM108 *NEW*

GMN SEAL 42X55X10 NIB

PACIFIC BEARING CO. BEARING NIB PSM162012

NSK BALL BEARING 6001DDUC3 NIB

RBC BEARINGS Y-96-L CAM FOLLOWER YOKE ROLLER W/ SEAL, NIB

BINKELMAN BUSHING 2 PER BAG PU-64-12D

MCGILL GR-16-SS NIB

RBC NEEDLE ROLLER BEARING, SJ7355, NIB

BROWNING  1-1/8", 2-GROOVE, SHEAVE 2BK40X 1 1/8 *NEW* UNOPEN

BINKELMAN POWDER METAL SLEEVE BEARING *NEW NO BOX, LOT OF 2*

SNR SINGLE ROW BALL BEARINGS, 625ZZ, NIB LOT OF 4

TORRINGTON / FAFNIR 3MM9105WI CR DUL SUPER PRECISION BEARING SET, NIB

CAM FOLLOWER BEARING 885167 OS NIB LOT OF 5

TORRINGTON 555D22-W33 F3 SPHERICAL BEARING, NIB

IMPERVRON  BALL AND ROLLER BEARING 1-15/16'' NIB U-331 D

SKF SINGLE DIRECTION THRUST BALL BEARING, 51110 *NEW UNOPENED*

INPRO/SEAL BEARING ISOLATOR 1770-A-07348-0 SEALED

MARTIN 3/16" SPROCKET 40BS1513/16 *NEW* UNOPEN

FAFNIR LSA001 3/16 MOUNTED BALL BEARING UNIT

SKF BALL BEARING LBCR 50 A-2LS NIB

BROWNING  1-1/8", 2-GROOVE, SHEAVE 2BK40X 1 1/8

MB MANUFACTURING MOUNTED BEARING C351-1516 *NEW* SEALED

STAR RUNNER BLOCK / BALL RAIL 1624-324-10 *NEW*

CHICAGO RAWHIDE * OIL SEAL NIB * 22493

CHICAGO RAWHIDE * OIL SEAL NIB * 27251

PCI TRACK ROLLER BEARING VTR-3.50 NIB

TIMKEN TAPERED ROLLER BEARING NIB 56425

TIMKEN .930" I.D.2.230" O.D TAPERED ROLLER BEARING, 23092 *NEW*

SEALMASTER STD RUBBER MOUNT 1 1/4IN NIB SRP-20R

TIMKEN TAPERED ROLLER BEARING  HM212011

BOWER/BCA BEARINGS NIB HM 212011

NSK 39-1/4" LINEAR GUIDE RAIL W/ 2 BEARING BLOCKS

SKF SINGLE ROW BALL BEARING, 6206-Z/C3Q66 *NEW UNOPENED*

HUB CITY 1-3/4IN. OD 1-3/8IN. ID  TAKE UP BEARING BLOCK B250X1 *NEW*

TORRINGTON ROLLER BEARING, JH-1016 *NEW*

DODGE 1610 x 1-5/8, TAPER-LOCK BUSHING 117086 *NEW*

McGILL GR24SS GUIDEROL BEARING RING AND ROLLER ASSEMBLY, NIB

GMN SUPER PRECISION BEARING S6006 C TA ABEC 7 UM 250 N

MCGILL / CAMROL CAMYOKE BEARING CYR-1 5/9-5 *NEW*

FAFNIR 1-1/4"I.D, 2-1/8"O.D, BEARING 2MM9106WI DUL NIB

TIMKEN 3.4"ID 4.2OD TAPERED BEARING JH307710 *NEW*

IKO CAM FOLLOWERS, CRH30V, NNB LOT OF 4

BEARING FLANGE WITH 2 BOLT SCREWS  SB204 12G

INA NEEDLE BEARING LR5304-2RS LOT OF 2, NIB

KOYO 7305BGC3FY ANGULAR CONTACT BALL BEARING NIB

THOMSON * LINEAR BALL BEARING CARRIAGE NIB * SIZE 25-A

UNKNOWN MFG * 304 REDUCER BUSHING * 2 X 1/8"

TIMKEN * ROLLER BEARINGS * 22211KCJW33C3

INA 12MM STUD DIA. 30MM ROLLER DIA. CAM FOLLOWER, KR30PP *NEW*

TIMKEN FAFNIR SUPER PRECISION BEARING 2MM9111WICRDUL SEALED

MCGILL CAM YOKE ROLLER CYR 1 5/8 NIB

RBC BEARING SJ7284 NIB

LINK-BELT PILLOW BLOCK NIB LB P3U219N

YALE TAPERED ROLLER 9099324-09 *NEW*

FAFNIR BALL BEARING 206KLL NIB

INA YOKE ROLLER BEARING, LR205NPPU, NIB

NSK LINEAR GUIDE LAH30EM / H30 *NEW*

INA TC1220 AXIAL NEEDLE ROLLER BEARINGS, LOT OF 3, NIB

McGILL CAM FOLLOWER CFH 1-3/8 *NEW*

NTN PILLOW BLOCK BEARING AEFL205-100D1W NIB

TORRINGTON NTA-3244 THRUST BEARINGS, LOT OF 3, NEW IN BAG

INA 1-1/4" SHAFT DIA. CAM FOLLOWER, CF56PPSK

INA X-LIFE BEARING NKI 65/35-XL *NEW*

THE GENERAL 6209 PRECISION BALL AND ROLLER BEARING, NIB

FAFNIR TIMKEN BEARING 9112KDD FS899E

TIMKEN TAPERED ROLLER BEARING 2720 NIB

TIMKEN 5.29MM I.D., 38.46MM O.D. TAPERED ROLLER BEARING 05075 *NEW*

NDH 2.040" OD 1.014" ID BEARING 903205 *NEW*

MARTIN 1-1/4" BORE, BUSHING SDS 1 1/4 *NEW, UNOPENED*

CR INDUSTRIES OIL SEAL 60027

NTN BEARING A4059 NIB

NDH 2.040" OD 1.014" ID BEARING 903205 *NEW*

MARTIN 1-1/4" BORE, BUSHING SDS 1 1/4 *NEW, UNOPENED*

CR INDUSTRIES OIL SEAL 60027

NTN BEARING A4059 NIB

McGILL? 1/2" SHAFT PRECISION BREAING STANDARD STUD CAMFOLLOWER CF-1/2-SB *NEW*

SKF BEARING 6210 2RSJ/EM NIB

MARTIN 18 TOOTH 40BB18H LOT OF 2 NIB

METALLIC BEARING SHIELD USED IN 5" TYPE SQC5, C501 NNB

MARTIN TAPERED BUSHING 2012 24M LOT OF 2 NIB

METALLIC # 14 DWG BEARING SHIELD, SQC5 C501 NNB

ABC SMITH BEARING CAM FOLLOWER CR-7/8-X NIB

BROWNING 1.6"ID, 5.5"OD, 36 TEETH, SPUR GEAR YSS636

RINGFEDER CORP HSDA-63W LOCKING ASSEMBLY, NIB

NSK BEARING 6207ZZC3 SERIES A

TORRINGTON TIMKEN ROLLER BEARING B-610 NIBAC

TIMKEN TAPERED ROLLER BEARING A2126 NIB

RBC CAM-CENTRIC S-32-LW NIB

REX SELF ALIGNING ROLLER BEARING ZA-2211

INA BEARING NA-RNA 22/8 RSR

IKO CYLINDRICAL ROLLER BEARING NAS5014 N

INA BEARING  IR 55X63X45

JAF * DOUBLE ROW BALL BEARING NNB * 5306

SKF BALL BEARING 6004 2RSJEM LOT OF 5 NIB

LAMINA SELF LUBE STRAIGHT MOLD BUSHING *NEW, CASE OF 4*

FAFNIR DOUBLE ROW BALL BEARING 5307W NIB

FAFNIR Ball Bearing Pillow Block SAS1 3/4

MCGILL MCFR 62 S CAM FOLLOWER BEARING, NIB

MARTIN 2" BORE QUICK DISCONNECT BUSHING, SD-2 *NEW*

NDH / DELCO / GM 5207 BALL BEARING *NEW, UNOPENED*

BARDEN PRECISION BEARINGS 212HDL NIB 2 PER BOX

PBC LINEAR BEARING HPV-057 *NEW IN BOX*

MB MANUFACTURING 1.125" BORE, NYLA-K MOUNTED BALL BEARING FC2251-18 *NEW*

FAFNIR / TIMKEN SUPER PRECISION BEARINGS MM207K

PBC BEARING PN 12

MARTIN 3/4" BORE 11 TEETH SPROCKET, 35BS11 *NEW*

HILMAN ROLLERS 8-TON CAPACITY ROLLERS 8-NT-95162, LOT OF 2

FAFNIR 1-1/8"BORE 1-1/4"BORE BALL BEARINGS RA102RR + COL *NEW*

SKF CYLINDRICAL ROLLER BEARING 5024

STANDARD 73MM I.D. 97MM O.D. LOCKNUT BEARING, N-14 *NEW*

MRC BALL BEARING H501 5207MFFG

PEER SINGLE ROW BALL BEARINGS, 6206Z *NEW LOT OF 2*

TORRINGTON 2-3/4"OD NEEDLE ROLLER & CAGE THRUST ASSEMBLY NTA-3244 *LOT OF 3 NEW*

SKF SINGLE ROW DEEP GROOVE BALL BEARING, 62308-2RS1, NIB

TIMKEN TAPERED ROLLER BEARING 12303 SEALED

TORRINGTON / FAFNIR 2MM208WI CR SUPER PRECISION BEARING , NIB

FAFNIR C1 10-69 BALL BEARING NIB 208KDD / FS50000

BROWNING 1-7/16" SHAFT DIA. 2-BOLT FLANGE MOUNT BEARING, VF2S-123M *NEW*

FAFNIR 35MM I.D. 72MM O.D. DOUBLE ROW BALL BEARING, 5207W *NEW*