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1. 基本原理
可編程控制器，英文稱ProgrammableLogicController，簡稱PLC。PLC是基于電子計(jì)算機(jī)，且適用于產(chǎn)業(yè)現(xiàn)場工作的電控制器。它源于繼電控制裝置，但它不像繼電裝置那樣，通過電路的物理過程實(shí)現(xiàn)控制，而主要靠運(yùn)行存儲于PLC內(nèi)存中的程序，進(jìn)行進(jìn)出信息變換實(shí)現(xiàn)控制。 
PLC基于電子計(jì)算機(jī)，但并不等同于普通計(jì)算機(jī)。普遍計(jì)算機(jī)進(jìn)行進(jìn)出信息變換，多只考慮信息本身，信息的進(jìn)出，只要人機(jī)界面好就可以了。而PLC則還要考慮信息進(jìn)出的可靠性、實(shí)時(shí)性，以及信息的使用等題目。特別要考慮怎么適應(yīng)于產(chǎn)業(yè)環(huán)境，如便于安裝，抗干擾等題目。 
1.1實(shí)現(xiàn)控制要點(diǎn) 
輸進(jìn)輸出信息變換、可靠物理實(shí)現(xiàn)，可以說是PLC實(shí)現(xiàn)控制的兩個(gè)基本要點(diǎn)。 
輸進(jìn)輸出信息變換靠運(yùn)行存儲于PLC內(nèi)存中的程序?qū)崿F(xiàn)。PLC程序既有生產(chǎn)廠家的系統(tǒng)程序(不可更改)，又有用戶自行開發(fā)的應(yīng)用（用戶）程序。系統(tǒng)程序提供運(yùn)行平臺，同時(shí)，還為PLC程序可靠運(yùn)行及信號與信息轉(zhuǎn)換進(jìn)行必要的公共處理。用戶程序由用戶按控制要求設(shè)計(jì)。什么樣的控制要求，就應(yīng)有什么樣的用戶程序。 
可靠物理實(shí)現(xiàn)主要靠輸人（INPUT）及輸出（OUTPUT）電路。PLC的I/O電路，都是專門設(shè)計(jì)的。輸進(jìn)電路要對輸進(jìn)信號進(jìn)行濾波，以往掉高頻干擾。而且與內(nèi)部計(jì)算機(jī)電路在電上是隔離的，靠光耦元件建立。輸出電路內(nèi)外也是電隔離的，靠光耦元件或輸出繼電器建立。輸出電路還要進(jìn)行功率放大，以足以帶動一般的產(chǎn)業(yè)控制元器件，如電磁閥、接觸器等等。 
I/O電路是很多的，每一輸進(jìn)點(diǎn)或輸出點(diǎn)都要有一個(gè)I或O電路。PLC有多I/O用點(diǎn)，一般也就有多少個(gè)I/O用電路。但由于它們都是由高度集成化的電路組成的，所以，所占體積并不大。 
輸進(jìn)電路時(shí)狀況，并將其暫存于輸進(jìn)暫存器中。每一輸進(jìn)點(diǎn)都有一個(gè)對應(yīng)的存儲其信息的暫存器。 
輸出電路要把輸出鎖存器的信息傳送給輸出點(diǎn)。輸出鎖存器與輸出點(diǎn)也是逐一對應(yīng)的 
這里的輸進(jìn)暫存器及輸出鎖存器實(shí)際就是PLC處理器I/O口的寄存器。它們與計(jì)算機(jī)內(nèi)存交換信息通過計(jì)算機(jī)總線，并主要由運(yùn)行系統(tǒng)程序?qū)崿F(xiàn)。把輸人暫存器的信息讀到PLC的內(nèi)存中，稱輸進(jìn)刷新。PLC內(nèi)存有專門開辟的存放輸進(jìn)信息的映射區(qū)。這個(gè)區(qū)的每一對應(yīng)位（bit）稱之為輸進(jìn)繼電器，或稱軟接點(diǎn)。這些位置成1，表示接點(diǎn)通，置成0為接點(diǎn)斷。由于它的狀態(tài)是由輸進(jìn)刷新得到的，所以，它反映的就是輸進(jìn)狀態(tài)。 
輸出鎖存器與PLC內(nèi)存中的輸出映射區(qū)也是對應(yīng)的。一個(gè)輸出鎖存器也有一個(gè)內(nèi)存位（bit）與其對應(yīng)，這個(gè)位稱為輸出繼電器，或稱輸出線圈?？窟\(yùn)行系統(tǒng)程序，輸出繼電器的狀態(tài)映射到輸出鎖存器。這個(gè)映射也稱輸出刷新。輸出刷新主要也是靠運(yùn)行系統(tǒng)程序?qū)崿F(xiàn)的。這樣，用戶所要編的程序只是，內(nèi)存中輸進(jìn)映射區(qū)到輸出映射區(qū)的變換，特別是怎么按輸進(jìn)的時(shí)序變換成輸出的時(shí)序。這是一個(gè)數(shù)據(jù)及邏輯處理題目。由于PLC有強(qiáng)大的指令系統(tǒng)，編寫出滿足這個(gè)要求的程序是*可能的，而且也是較為輕易的
BROWNING L-100 JAW COUPLER 7/8 IN BORE HUB B261798

NEW BROWNING L-100 COUPLING JAW TYPE TAPER TAPERED 1-3

NEW REXNORD 20SHSB 1-5/8 STRAIGHT BORE HUB 1-5/8 IN D22

NEW REXNORD OMEGA 3SHSB STD 7300250 STRAIGHT 1IN BORE H

NEW FALK 1060T 0246656 RSB HUB D422571

NEW H354K STEEL 2IN OD 3/4IN BORE HUB D367074

NEW WARNER ELECTRIC 540-2035 ARMATURE 19TOOTH 1-5/16 IN

NEW REXNORD 40 SHRB STD STRAIGHT BORE 5/8 IN HUB B41904

NEW FALK 0246654 1040T STEELFLEX RSB HUB B312446

NEW ATRA-FLEX M2 COUPLING STEEL BORE RSB 2 IN HUB B3329

NEW MAGNALOY MODEL 200 JAW COUPLING HUB B401314

NEW MARTIN 100 JAW COUPLING 3/4 IN HUB B292746

NEW REXNORD 7300320 STRAIGHT HUB 1-1/4 IN BORE D227080

NEW FALK 0246657 1070T COUPLING RSB HUB B401577

NEW KOP-FLEX 1963271 4H FHUB GEAR 2-1/2 IN RSB HUB B402

NEW TB WOODS GDFRB GEAR 1 IN HUB B265426

NEW DODGE SDS1 STEEL BUSHING QD 1 IN HUB D221935

SIZE 1-1/4 COUPLING 1-15/16IN BORE QD HUB D411927

NEW LOVEJOY C 7/8 00035 HUB 1-1/4 BORE D425493

NEW BOSTON GEAR FC15-5/8 JAW COUPLING STEEL 5/8 IN QD H

NEW FALK 704598 STEELFLEX 1 IN HUB D255789

NEW FALK 1040T31 261662 SPACER HUB D422656

NEW BROWNING YSS16F32X1 SPUR GEAR 32TEETH 1IN HUB B2018

NEW FALK 0246657 1070T COUPLING RSB HUB D404428

NEW KOP-FLEX 2B FHUB FLEX GEAR RSB HUB UNBORED D204700

NEW BOSTON GEAR FC15-1/2 STEEL 1/2 IN HUB D250099

NEW FALK 1203681 1015G/1-1/2GF STEEL QD 1-1/2IN BORE HU

NEW BOSTON GEAR FC15-1/2 STEEL 1/2 IN HUB B261290

NEW STEEL 70X79MM OD QD 1-1/2 IN BORE HUB D322541

NEW BUSHED TAPER BORE 5-BOLT STEEL TAPER HUB D330321

NEW WARNER ELECTRIC 540-0320 SPLINED 1-1/4IN BORE HUB D

NEW REXNORD 5 SHSB STD 7300330 STRAIGHT BORE COUPLING Q

NEW FALK 9F TYPE F RSB STEELFLEX COUPLING RSB UNBORED H

NEW ATRA-FLEX M1 HUB RSB 1-5/8 IN HUB D427499

NEW NEW WAY PACKAGING 540-0325 DRIVE 5/8 IN HUB B325772

NEW FALK 1203218 1020G FLEX GEAR STAINLESS RSB HUB B239

NEW FALK 0704601 1030T ASSEMBLY 1-3/8 IN HUB B255047

NEW KOPPERS CX95346 TYPE BS SIZE 1 FLEX 1.124/1.1245IN 

NEW LOVEJOY 697904 00044 ROUGH BORE HUB D382642

NEW FALK 1060T 5000 STEEL 1-1/2 IN HUB D443682

NEW CARLSON 2523 DRIVE 1-15/16 IN HUB D214038

NEW WARNER 540-0739 DRIVE HUB 13/16 IN HUB D223412

NEW REXNORD 7300815 1610 OMEGA TAPER-LOCK HUB D441830

NEW KOP-FLEX 20 EHUB ELASTOMERIC COUPLING HUB B398112

NEW LOVEJOY? 697904 ? 00024 NYFL TAPER 1-5/8 IN HUB B26

NEW REXNORD 1203217 LIFEALIGN RSB BORE 1015G FLEX GEAR 

NEW FALK 70T 704642 STEEL 1.994 IN BORE HUB D463300

KOP-FLEX SIZE 60 ELASTOMERIC COUPLING ALUMINUM SPACER R

NEW FALK 30T31 STEELFLEX COUPLING SPACER SHAFT RSB HUB 

NEW FALK 0251670 1020T31/35 SHAFT GEAR RSB HUB B403480

NEW REXNORD 114423 DBZ 75 RB HUB D300344

LOVEJOY L-110 .750 JAW STEEL COUPLING 5/8 IN HUB B29568

NEW FALK 0789344 10R10 HUB 5/8IN BORE 3/8 X 3/16 KW D23

NEW RA JONES 306716 25MM HUB D230015

NEW FALK 0765050 1015G20 FLEX 1/2 X 1/4 KW 2.1230/2.124

NEW REXNORD 2SHCB STD 7300218 OMEGA 5/8IN STRAIGHT BORE

NEW FALK 1030T 7/8 IN STAINLESS SHAFT HUB B424672

NEW TB WOODS 7SCH78 7SC-HX7/8 SPACER 7/8 IN HUB D304257

NEW REXNORD 5SHSB STRAIGHT BORE COUPLING 1-1/2 IN HUB B

NEW MARTIN MS090 JAW COUPLING 7/16 IN HUB B446481

NEW MARTIN ML110 JAW COUPLING POWER TRANSMISSION 1-1/4 

NEW JAW STYLE STEEL BORE COUPLING 1-1/2IN ASSEMBLY COUP

NEW FALK 1030T31 251671 SHAFT HUB RSB D422580

NEW FALK 0246652 1020T COUPLING BORE RSB HUB B400143

NEW FALK 1020T31 STEELFLEX COUPLING SHAFT RSB HUB B4013

KOP-FLEX SIZE 80 ALUMINUM ELASTOMERIC COUPLING ASSEMBLY

NEW FALK 1020G10 STEEL FLEX 1.6860/1.6865 1-11/16IN HUB

KOP-FLEX SIZE 80 ALUMINUM ELASTOMERIC TYPE COUPLING ASS

NEW FALK 0704600 1030T 1/4 X 1/8 KW TAPER 1-1/4 IN HUB 

NEW FALK 359832 HUB 1-5/8IN D230833

NEW LOVEJOY C 1.5 1.626 697904 96678 SIER-BATH 3/8X3/16

NATIONAL PARTS SUPPLY 411321308 ADJUSTABLE 1/2 IN HUB B

NEW BOSCH 90128110128055 CLAMP SPLIT STEEL 5/16 IN HUB 

NEW DODGE RELIANCE 022348 6SC-H 1-1/8 D-FLEX SPACER 1-1

STEEL COUPLING 2-3/8IN BORE HUB D411902

NEW MARTIN MS099 1/2 JAW COUPLING POWER TRANSMISSION 3

NEW LOVEJOY 697904 94426 C 2.5 12X3.3MMKW WSS COUPLING 

WALDRON 1-1/2W XB FLEXALIGN QP SIZE 1-1/2 COUPLING 1-3

FALK 0246655 1050T RSB 1-1/2 IN HUB B312454

NEW TB WOODS 3J12 SF FLANGE COUPLING 1/2 IN HUB B246286

KOP-FLEX 60 BHUB ELASTOMERIC SPACER SIZE 60 ALUMINUM 2 

COLUMBIA MACHINE 43485-96 PAR CAR FRONT 3-WHEEL SUSPENS

NEW TB WOODS 3J 3/4 FLEX FLANGE COUPLING 3/4 IN HUB B45

NEW HYSTER 275563 FORKLIFT REPAIR PART 1 IN HUB B414662

COUPLING INSERT 3-13/16IN OD 2-1/4IN BORE HUB D411939

NEW ATRA-FLEX A2 1-7/16 IN HUB D435056

NEW KOP-FLEX 006414 ELASTOMERIC SIZE 80 RHUB SPACER ROU

NEW REXNORD 10SHSB STD 7300355 OMEGA COUPLING STRAIGHT 

KOPPERS SIZE 90 C ELASTOMERIC SPACER 5 IN HUB B401088

NEW KOPPERS CX0068I SIZE 90 5 IN HUB B399336

KOP-FLEX ELASTOMERIC ALUMINUM SIZE 40 COUPLING ROUGH BO

NEW FALK 0246658 1080T FLEXIBLE TAPERED GRID COUPLING R

NEW FALK 1060T UNBORED COUPLING RSB HUB B465134

NEW WARNER ELECTRIC 5125 541 004 SPLINED 3/4IN ID ARMAT

NEW KOP-FLEX 60 EHUB ELASTOMERIC SIZE 60 COUPLING 1 IN 

NEW LOVEJOY L-150 COUPLING JAW 1-1/4 IN HUB B267021

NEW LOVEJOY 00018 SIER-BATH GEAR STEEL 1-1/8IN BORE HUB

NEW BALDOR 04B ALUMINUM SPLINED COUPLING 3/4IN BORE HUB

NEW JACKSON 208918 1-1/4 IN IDLER HUB D310732

NEW ATRA-FLEX A0 F RSB RSB HUB D427513

KOPPERS 50 AHUB ELASTOMERIC SIZE 50 COUPLING SPACER 1 I

KOPPERS SIZE 90R ELASTOMERIC SPACER 1-1/8 IN HUB B40999

999 COUPLING HUB INSERT 3IN OD 1IN BORE D412949

TAPER BUSHED ASSEMBLY 1-3/4IN ID TAPER HUB D418306

NEW MARTIN ML100 1 1/4 JAW COUPLING 1-1/4 IN QD HUB B44

NEW LOVEJOY C3 COUPLING 3-3/8 IN HUB D457847

NEW URSCHEL 19019 DRIVE HUB 1.5 IN BORE D221608

NEW GUARDIAN ELECTRIC M-28 STEEL COUPLING 1-1/8IN BORE 

NEW FALK 1203216 1010G FLEX GEAR COUPLING RSB 1-3/4 IN 

NEW KOP-FLEX COUPLING HUB 1-3/4IN STEEL D204420

NEW ROTEX 42 STEEL HALF COUPLING SETSCREW LOCKING 1-3/8

NEW MARTIN ML110 7/8 JAW COUPLING HALF KEYED 7/8 IN QD 

NEW LOVEJOY AL099 COUPLING JAW 3/16/3/32 KW 5/8 IN HUB 

REXNORD 10SHSB STD 7385821 COUPLING STRAIGHT BORE HUB S

NEW FALK 0744087 1030T31/35 SPACER ROUGH BORE 2.375 IN 

NEW KOP-FLEX 1-1/2W FHUB GEAR COUPLING HUB B446998

NEW NPS 402900681 3/4X1-3/8X1-1/2?IN BRASS DRIVE 3/4IN B

NEW LOVEJOY 00060 C 1.5 1-1/2 IN HUB B314322

DRESSER 39-35 BRAKE 1-1/8 IN BORE HUB B321619

NEW KHS-BART 11173-2 DRIVE HUB 1-1/16IN BORE D225676

NEW FALK 0251670 1020T31/35 SHAFT RSB HUB B399394

NEW FALK 0710652 1080T STEELFLEX COUPLING 2-15/16 IN BO

NEW FALK 1020G SEAL END GEAR COUPLING 62 TEETH FLEX 1.9

NEW FALK 10R 3100443 1/2X1/4KW 1-7/8IN BORE HUB D266206

REXNORD 5 SHSB STE 00330 ELASTOMER STEEL SPACER ASSEMBL

REXNORD 3SHSB 7300300? STRAIGHT BORE STEEL COUPLING QD 

NEW REXNORD 5 SHSB STD 7300330? STRAIGHT BORE COUPLING 

NEW MAGNALOY M40011612 MODEL 400 COUPLING 1-1/2 IN HUB 

NEW ROTEX TYPE 24 STEEL 24MM HUB D250106

NEW EMERSON 1090T KOP-FLEX STEEL COUPLING 2.3756IN BORE

NEW FALK 0246659 1090T RSB HUB B341315

NEW REXNORD 5 SHSB STD 7300330 STRAIGHT BORE COUPLING Q

NEW CMC8924 STEEL 1-1/2 IN HUB D356006

NEW FALK 744088 1030T31 CL. OIM 3.500 SPACER 3/8 IN HUB

NEW KOP-FLEX 2W FHUB UNBORED COUPLING SIZE 2 HUB D20719

NEW KOP-FLEX 003338 ELASTOMERIC SIZE 30 ROUGH BORE 3/8 

NEW LINK-BELT MC-24 2-1/8IN HUB D238917

NEW FALK 0704610 1040T 1-5/8 IN HUB D453210

NEW DOUGLAS MACHINE F23378 ADJUSTABLE TAPER LOCK 1610 H

NEW WHALLON 0230-0165-150-1 KEYLESS 1-1/2 IN HUB D24778

NEW 253203 50T 1215 1-13/16 IN HUB D253649

NEW BROWNING SHH1 SHEAR 1-1/2 IN HUB D276541

NEW REXNORD 4-SHSB 1-1/8 IN BORE HUB D418870

NEW BOSTON GEAR FC25 COUPLING JAW SOLID RSB HUB B446997

NEW FALK 1070T31/35 0258639 STEELFLFEX HUB RSB HUB FOR 

NEW DODGE 41162904B COUPLING GEAR 3/4 IN HUB D373330

NEW REXNORD 7300240 3 SHRB STD STRAIGHT BORE ROUGH BORE

NEW STEEL QD 3-11/16 IN HUB D328911

NEW KOP-FLEX 80 BHUB ELASTOMERIC DROP OUT SPACER SIZE 8

NEW ZERO-MAX B-12 PHAS-LOK ADJUSTING 1-1/2IN ID HUB D38

NEW KOP-FLEX 80 AHUB ELASTOMERIC DROP OUT SPACER SIZE 8

NEW SURDRY 0300565 LOCKING ASSEMBLY 3-3/16IN BORE HUB D

NEW BROWNING SHH1 SHEAR 40MM BORE HUB D326714

NEW TB WOODS 8SC-H COUPLING SPACER 1-5/8 IN HUB B322958

NEW KOP-FLEX CX00541 ELASTOMERIC SIZE 60 7/8 IN E HUB B

NEW FALK 754785 30T 1-3/16IN KW 1/4X1/8IN STEEL HUB D2

NEW KOP-FLEX 2H FHUB GEAR SERIES H SIZE 2 3/4IN HUB B40

NEW FALK 0258640 STEELFLEX COUPLING 1080T31 SHAFT RSB H

NEW RA JONES STDAHB-255 STEEL 1 IN HUB D247530

NEW REXNORD 7300680 50 SHRB STD STRAIGHT COUPLING 1 IN 

NEW FALK 1030T 1/4X1/8KW 0704599 SHAFT 1-1/8 IN HUB D31

NEW FALK 0704591 1020T 3/61X3/32 KW 7/8 IN HUB D312995

236492 COUPLING HUB INSERT 3-7/16IN OD 1-3/4IN BORE D41

236487 COUPLING HUB INSERT 3-7/16IN OD 1-3/4IN BORE D41

NEW WARNER ELECTRIC 5125-541-003 ARMATURE SF-400 BORE 5

3-7/8 IN OD COUPLING INSERT 1-1/2 IN BORE HUB D412945

NEW LOVEJOY 68514441315 L050 SHAFT JAW COUPLING TRANSMI

NEW FALK 1020G 1203218 FLEX GEAR COUPLING STEEL RSB HUB

FALK 744088 1030T31 SPACER FOR 30 & 1030T31/35 744088 3

NEW FALK 0765097 1020G/2GF RIGID HUB BELT QD 1/2X1/4 IN

174147 3-3/8 IN OD COUPLING INSERT 1-3/4 IN HUB D412925

KOPPERS NA SIZE 90 B 5 IN ELASTOMERIC SPACER HUB B39970

NEW LOVEJOY 7SCH 5/8 36714 SPACER HUB D422414

NEW DODGE 006599 1050T COUPLING 1-1/8IN HUB D368126

NEW TB WOODS L100X1/2 NK COUPLER JAW TYPE COUPLING ROUG

NEW FALK 1060T31 251674 SPACER SHAFT COUPLING RSB HUB B

NEW FALK 0704620 1050T 3/8X3/16 KW 1-3/4 IN HUB D319245

NEW PNEUMATIC SCALE W-08849-18214 ADJUSTING SPLIT 1-1/2

NEW BROWNING HCH1 1-5/8X1-9/16IN BORE TAPER HUB D412085

NEW BROWNING CHJP4 JAW TYPE STEEL HALF COUPLING 1 IN QD