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PLC的外設(shè)很豐富，編程器種類很，用起來(lái)都較方便，還有數(shù)據(jù)監(jiān)控器，可監(jiān)控PLC的工作。使用PLC的軟件也很，不僅可用類似于繼電電路設(shè)計(jì)的梯形圖語(yǔ)言，有的還可用BASIC語(yǔ)言、C語(yǔ)言，以至于自然語(yǔ)言。這些也為PLC編程提供了方便。
PLC的程序也便于存儲(chǔ)、移植及再使用。某定型產(chǎn)品用的PLC的程序完善之后，凡這種產(chǎn)品都可使用。生產(chǎn)一臺(tái)，拷貝一份即可。這比起繼電器電路臺(tái)臺(tái)設(shè)備都要接線、調(diào)試，要省事及簡(jiǎn)單得。
（4）修方便：這是由于：
①PLC工作可靠，出現(xiàn)故障的情況未幾，這大大減輕了修的工作量。這在講述PLC的第三個(gè)特點(diǎn)時(shí)，還將進(jìn)一步介紹。
②即使PLC出現(xiàn)故障，修也很方便。這是由于PLC都設(shè)有很故障提示信號(hào)，如PLC支持內(nèi)存保持?jǐn)?shù)據(jù)的電池電壓不足，相應(yīng)的就有電壓低信號(hào)指示。而且，PLC本身還可作故障情況記錄。所以，PLC出了故障，很易診斷。同時(shí)，診斷出故障后排故也很簡(jiǎn)單。可按模塊排故，而模塊的備件市場(chǎng)可以買到，進(jìn)行簡(jiǎn)單的更換就可以。至于軟件，調(diào)試好后不會(huì)出故障，再要依據(jù)使用經(jīng)驗(yàn)進(jìn)行調(diào)整，使之完善就是了。
（5）改用方便：PLC用于某設(shè)備，若這個(gè)設(shè)備不再使用了，其所用的PLC還可給別的設(shè)備使用，只要改編一下程序，就可辦到。假如原設(shè)備與新設(shè)備差別較大，它的一些模塊還可重用。
2.3工作可靠
用PLC實(shí)現(xiàn)對(duì)系統(tǒng)的控制是非常可靠的。這是由于PLC在硬件與軟件兩個(gè)方面都采取了很措施，確保它能可靠工作。事實(shí)上，假如PLC工作不可靠，就無(wú)法在產(chǎn)業(yè)環(huán)境下運(yùn)用，也就不成其為PLC了。
(1) 在硬件方面：
PLC的輸進(jìn)輸出電路與內(nèi)部CPU是電隔離。其信息靠光耦器件或電磁器件傳遞。而且，CPU板還有抗電磁干擾的屏蔽措施無(wú)觸點(diǎn)的，而且為高度集成的，數(shù)目并不太，也為其可靠工作提供了物質(zhì)基礎(chǔ)。
在機(jī)械結(jié)構(gòu)設(shè)計(jì)與制造工藝上，為使PLC能安全可靠地工作，也采取了施，可確保PLC耐振動(dòng)、耐沖擊。使用環(huán)境溫度可高達(dá)攝氏5
度，有的PLC可高達(dá)80--90度。
有的PLC的模塊可熱備，一個(gè)主機(jī)工作，另一個(gè)主機(jī)也運(yùn)轉(zhuǎn)，但不參與控制，僅作備份。一旦工作主機(jī)出現(xiàn)故障，熱備的可自動(dòng)接替其工作。
還有更進(jìn)一步冗余的，采用三取一的設(shè)計(jì)，CPU、I/O模塊、電源模塊都冗余或其中的部分冗余。三套同時(shí)工作，*輸出取決于三者中決定的結(jié)果。這可使系統(tǒng)出故障的機(jī)率幾乎為零，做到*。當(dāng)然，這樣的系統(tǒng)本錢是很高的，只用于特別重要的場(chǎng)合，如鐵路車站的道叉控制系統(tǒng)。
NEW KOP-FLEX 1963313 1 1/2H FHUB GEAR 1/2 IN ROUGH BORE
NEW KOP-FLEX 415094 FLEX TYPE H COUPLING 17/32 IN ROUGH
NEW FALK 246656 STEELFLEX 60 1060T COUPLING HUB RSB HUB
NEW REXNORD 7300680 STRAIGHT COUPLING 1 IN ROUGH BORE H
NEW STEARNS 51671030001G ASSEMBLY 1-3/8IN HUB D401816
KOP-FLEX 53711 STEEL COUPLING 5-3/8 IN HUB B332865
NEW KOP-FLEX 1961523 2B FHUB POWER TRANSMISSION ASSEMBL
NEW RA JONES 166648 STAINLESS 4 BOLT HUB 1 IN BORE DRI
NEW FALK STEELFLEX 1030G/3GF RIGID EXPOSED BOLT QD 5 IN
FALK 1070WA21 9.54IN FLEXIBLE ELEMENT COUPLING ASSEMBLY
NEW ATRA-FLEX A2 HUB 1.4375 SS 1-7/16 IN BORE D436759
NEW PNEUMATIC SCALE 100875 DRIVE 1-5/8 IN HUB B369852
NEW RAPIDPAK ALKAR 55857 DRIVE HUB ROTOR BLADE ASSEMBLY
NEW KHS-BART 6333 MOUNTING 1 3/4IN BORE HUB D226587
NEW NPS 401800201 STEEL 8IN OD 1-1/2 IN TIMING HUB D270
NEW KOP-FLEX 1961853 3B SB RHUB COUPLING HUB B332707
NEW REXNORD 7300780 70HTL 3535 BUSHED TAPER COUPLING HU
NEW KAUFMAN ENGINEERED SYSTEMS 064-080-00-4249 2-1/2IN
NEW LOVEJOY 00132 SIER-BATH F1 STEELGEAR COUPLING 1/2 I
NEW AMERIDRIVES 073540-000FB 1.873/1.874IN HUB 1-7/8IN
NEW RA JONES 116513 HEX 1-3/8 IN HUB D250071
NEW LOVEJOY 69790400014 NYFLEX SIER-BATH GEAR 5/8IN BOR
NEW KRONES 1-800-04-895-4 BRASS GRIPPER HUB 1-1/16 IN S
NEW KOP-FLEX 1070T STEEL 1-7/8 IN BORE HUB D421185
NEW RA JONES STD806HL-A STEEL 6IN OD 1-1/2 IN QD HUB D3
NEW REXNORD 40HSB 7300671 OMEGA STEEL 1-7/8 IN HUB D424
NEW RA JONES CMH18967 STEEL ADJUSTABLE QD 1-1/2IN BORE
NEW MAHAFFY 1585 TAPER-LOCK 2012 BUSHING 1 15/16IN BORE
NEW FALK 0209022 12F STEELFLEX UNBORED STEEL COUPLING R
NEW KOP-FLEX CX41509 HUB TYPE HM GEAR COUPLING 7/16 IN
NEW 13BH 5430 5445 3 8-11/16IN OD STEEL COUPLING 2-3/4I
NEW RA JONES CMC9825BP 1-1/2IN BORE HUB D400546
NEW ATRA-FLEX M-4 STEEL COUPLING 60MM BORE HUB D422363
NEW ATRA-FLEX M3 MILLENIUM 2-3/8 IN BORE HUB D424218
NEW DODGE 006611 1060T 2-1/8 HK HUB 2-1/8IN BORE D22990
NEW KOP-FLEX 3 EB RHUB STEEL COUPLING 1-3/8 IN ROUGH BO
NEW KOP-FLEX 1960467 3 EB RHUB GEAR COUPLING 1-1/4 IN R
NEW FALK 90C 7362 COUPLING BUSHING QD 1.998IN 2IN HUB D
NEW KOP-FLEX 80 RHUB ELASTOMERIC SPACER COUPLING 1 IN H
NEW LOVEJOY F1 00139 3/8X3/16KW 1-1/2 IN HUB D436187
NEW KOP-FLEX 2W FHUB COUPLING SIZE 2 2-3/8IN BORE HUB D
NEW FALK 1050T31-0744094 STEEL SPACER RSB HUB B366508
NEW PNEUMATIC SCALE 102188 PSC STEEL DRIVE QD 1-1/4 IN
NEW MEYER MACHINE C-82-1-004/2.00?B 2IN BORE HUB D336113
KOP-FLEX 1960673 TYPE 2 1/2F FHUB TRANSMISSION COUPLING
NEW FALK 704618 STEELFLEX COUPLING 1-1/2 IN HUB KW 3/8X
TB WOODS L10034 COUPLER JAW TYPE TAPER 3/4 IN BORE COUP
NEW FALK 0704596 1030T 3/16X3/32KW 3/4IN ID HUB D276936
FALK 1140T 13IN OD STEELFLEX GEAR UNBORED COUPLING RSB
KOP-FLEX SERIES H & SERIES HD STEEL COUPLING 5-1/2 IN H
FALK 1040G 8-1/2IN OD FLEX GEAR COUPLING STEEL 4-1/2 IN
KOP-FLEX 2 1/2F TYPE FHUB POWER TRANSMISSION COUPLING Q
NEW KOP-FLEX TYPE FS FLEXIBLE FASTS STEEL COUPLING QD 3
NEW KOP-FLEX 1960319 3F FHUB GEAR COUPLING QD 3 IN HUB
FALK 1203686 STEELFLEX FLEX GEAR UNBORED COUPLING RSB 1
NEW KOP-FLEX 3-1/2B FHUB FLEX GEAR COUPLING UNBORED RSB
FALK 1100T STEELFLEX FLEX GEAR UNBORED COUPLING RSB 5-1
NEW RA JONES STD413H-A ADJUSTABLE STEEL 7/8 IN HUB D253
NEW KRONES 1-018-80-020-1 BRASS DRIVE HUB 1-3/8 IN SQUA
NEW BROWNING CHJP2X3/8 DRIVE JAW COUPLING 3/8 IN ROUGH
KOP-FLEX SIZE 70 SPACER COUPLING 1 IN ROUGH BORE HUB B4
NEW RINGFEDER 20X47 RFN 7013.0 SPANNSATZ 20MM ID HUB D4
KOP-FLEX 315097 FLEX TYPE B STEEL POWER TRANSMISSION QD
KOP-FLEX 4F FHUB STEEL COUPLING 2-1/2 IN HUB B333080
KOPPERS SIZE 50 TYPE B ELASTOMERIC COUPLING SPACER 1 IN
NEW DEMAG 71832644 STEEL COUPLING 1-1/4 IN HUB D428196
NEW LOVEJOY L-190 STANDARD JAW COUPLER 1-7/8IN QD HUB B
NEW FR DRAKE 57244 STEEL 3IN OD 1-1/4 IN BORE ADJUSTING
NEW LOVEJOY 69790400015 NYFLEX SIER-BATH GEAR 3/4IN BOR
NEW KHS-BART 11173-1 DRIVE HUB 1-1/16IN BORE D225690
NEW KOP-FLEX GEAR COUPLING 3B FHUB UNBORED HUB B332636
NEW REX REXNORD 30 SHRB STL STRAIGHT ROUGH BORE 23/32 I
NEW REXNORD AMR 375 STEEL COUPLING 2-3/4 IN HUB B329770
NEW FALK 1060T 246656 60 1060T STEELFLEX COUPLING TAPER
KOP-FLEX 3-3/8IN FAST'S BALTO MD BS RIGID HUB B358820
NEW NPS 403640117 DRIVE COUPLING STAINLESS 22-3/4IN LON
KOP-FLEX CX00677 SPACER ELASTOMERIC COUPLING SIZE 70 C
NEW STEARNS 51671030001H ASSEMBLY 1-5/8IN BORE HUB D340
NEW MAYR 2/100.210 ROBA-RN SLIP HUB CLUTCH 13.95MM BORE
NEW TB WOODS WE5H X 1-1/8 XTS STEEL 1-1/8IN BORE HUB D3
NEW FALK 1203222 LIFELIGN GEAR COUPLING 1040G FLEX RSB
NEW FALK 0744085 1030T31/35 COUPLING 1.625 SPACER RSB H
NEW 3-3/8IN OD COUPLING HUB INSERT 1-3/4IN BORE D412930
NEW WILLIAMS 55.0192.00 STEEL COUPLING HUB ASSEMBLY 48M
NEW KOP-FLEX 1961846 TYPE 2 1/2B SB RHUB POWER TRANSMIS
NEW BROWNING AAH-G SYNCRO-ANGLE ADJUSTING HUB 1IN D2133
NEW REXNORD 811410 AMR 162 NB KW COUPLING STEEL 1-1/2 I
NEW FALK 1050T 0908500 STEEL HUB D339433
NEW KEENE TECH LS9543 IDLER 1 IN HUB B337173
NEW FALK 1080T31/35 0744104 36 TOOTH STEEL COUPLING RSB
NEW FALK 1080T31/35 0744104 36 TOOTH STEEL COUPLING RSB
KOP-FLEX 4 1/2F FHUB STEEL COUPLING 3 IN HUB B333087
NEW MYERS C-52-16-014 CAST IRON HUB 6-1/16 IN OD 1-3/16
NEW DODGE 1060T31/35 006567 STEEL COUPLING QD 2-3/8IN B
NEW KOP-FLEX 80 EHUB SIZE 80 ELASTOMERIC SPACER ROUGH B
REXNORD AMR375NB THOMAS STEEL FLANGED COUPLING 2-5/8 IN
KOP-FLEX 80 RHUB ELASTOMERIC DROP OUT SPACER GEAR ALUMI
NEW KOP-FLEX 1963313 1-1/2H FHUB GEAR SERIES H 1/2 IN R
NEW FALK 0704627 STEELFLEX COUPLING 3/8X3/16IN KW 1-1/2
NEW REXNORD 40 HQD STL 7300885 REX OMEGA COUPLING QD 3-
NEW RA JONES 120681 STEEL FEED ROLLER 1-3/8IN BORE HUB
K69S1GPK-00032 DISC PULLEY 15MM HUB B388255
NEW FALK 0744082 1030T31/35 COUPLING CL 1.625 SPACER RS
KOP-FLEX 3 1/2B EB RHUB STEEL COUPLING 3 IN HUB B334580
NEW GMI C1030-000-CCH CROSS CRIMPER 2IN ID HUB D353288
NEW KOP-FLEX 70 RHUB ELASTOMERIC SPACER COUPLING 1IN RO
NEW KOP-FLEX 70 BHUB ELASTOMERIC SIZE 70 ALUMINUM 1-1/2
KOP-FLEX 1963230 EMERSON 2H FHUB SERIES H GEAR RSB HUB
NEW KOP-FLEX 1960632 1-1/2F FHUB SERIES KD2 POWER TRANS
NEW KOP-FLEX 1960707 3-1/2F SERIES 500 POWER TRANSMISSI
NEW BOSTON GEAR FC30-1-1/4 08286 SHAFT COUPLER RIGID JA
KOP-FLEX 40 RHUB ELASTOMERIC SPACER COUPLING SIZE 40 1
NEW KOP-FLEX 1960319 3F FHUB COUPLING FLEXIBLE MODEL F
NEW KOP-FLEX 1963354 3 1/2H FHUB SERIES H GEAR COUPLING
NEW STEARNS 5-16-7103-00-01?G HUB SET SCREW ASSEMBLY 1-3
NEW BUHLER TPFB-1015-7474-?1002 7/8IN BORE DRIVE HUB D38
化工機(jī)械設(shè)備網(wǎng)