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PLC还具有通讯接口,可与计算机链接或联网,与计算机交换信息。自身也可联网,以形成单机所不能有的更大的、地域更广的控制系统。
PLC还有强大的自检功能,可进行自诊断。其结果可自动记录。这为它的维修增加了透明度,提供了方便。
丰富的功能为PLC的广泛应用提供了可能;同时,也为产业系统的自动化、远动化及其控制的智能化创造了条件。
像PLC这样集丰富功能于一身,是别的电控制器所没有的;更是传统的继电控制电路所无法相比的。
2.2使用方便
用PLC实现对系统的控制是非常方便的。这是由于:首先PLC控制逻辑的建立是程序,用程序代替硬件接线。编程序比接线,更改程序比更改接线,当然要方便得多!
其次PLC的硬件是高度集成化的,已集成为种种小型化的模块。而且,这些模块是配套的,已实现了系列化与规格化。种种控制系统所需的模块,PLC厂家多有现货供给,市场上即可购得。所以,硬件系统配置与建造也非常方便。
正因如此,用可编程序控制器才有这个"可"字。对软件讲,它的程序可编,也不难编。对硬件讲,它的配置可变,而且也易于变。
具体地讲,PLC有五个方面的方便:
(1)配置方便:可接控制系统的需要确定要使用哪家的PLC,那种类型的,用什么模块,要多少模块,确定后,到市场上定货购买即可。
(2)安装方便:PLC硬件安装简单,组装轻易。外部接线有接线器,接线简单,而且一次接好后,更换模块时,把接线器安装到新模块上即可,都不必再接线。内部什么线都不要接,只要作些必要的DIP开关设定或软件设定,以及编制好用户程序就可工作。
(3)编程方便:PLC内部固然没有什么实际的继电器、时间继电器、计数器,但它通过程序(软件)与系统内存,这些器件却实实在在地存在着。其数目之多是继电器控制系统难以想象的。即使是小型的PLC,内部继电器数都可以千计,时间继电器、计数也以百计。而且,这些继电器的接点可无穷次地使用。PLC内部逻辑器件之多,用户用起来已不感到有什么限制。*考虑的只是进出点。而这个内部进出点即使用得再多,也无关紧要。大型PLC的控制点数可达万点以上,哪有那么大的现实系统?若实在不够,还可联网进行控制,不受什么限制。PLC的指令系统也非常丰富,可尽不困难地实现种种开关量,以及模拟量的控制。PLC还有存储数据的内存区,可存储控制过程的所有要保存的信息。……总之,由于PLC功能之强,发挥其在控制系统的作用,所受的限制已不是PLC本身,而是人们的想象力,或与其配套的其它硬件设施了。
NEW ATRA-FLEX A1 F RSB FLANGED 1-15/16 IN RSB HUB D4275
NEW BROWNING AAH-H ANGLE ADJUSTING 1IN BORE HUB D284593
KOPPERS SIZE 80 ELASTOMERIC COUPLING SPACER HUB TYPE B
NEW LOVEJOY C 2.5 697904 00095 1-7/8 IN HUB D380111
NEW ACCURATE INDUSTRIAL S30426201 STAINLESS 304 2-3/4 I
NEW REXNORD 60 SHRB STD 00690 65MM ROUGH BORE HUB D4186
NEW CHANGE PARTS 60991DH1 1-1/4 IN BORE DRIVE HUB D4644
NEW RA JONES CMH12866 STEEL 3-1/2X1-1/2X3/4 IN HUB D254
NEW KOP-FLEX 3 SB RHUB STEEL COUPLING 1-3/8 IN ROUGH BO
NEW FALK 1040T31 1.1250 259169 STEEL 1-7/8 IN HUB D2613
NEW KOP-FLEX 1963313 SIZE 1-1/2H FHUB GEAR RSB HUB B400
NEW KOP-FLEX ALUMINUM ELASTOMERIC SIZE 80 5IN COUPLING
NEW RA JONES STDAHB-306 1-1/4 IN BORE STEEL HUB D428559
KOP-FLEX 1963230 2H FHUB SERIES H SIZE 20 GEAR 3/4 IN R
NEW KOP-FLEX 1964170 204 KD 21 SHUB UNBORED STEEL HUB D
NEW FALK 0209017 COUPLING STEEFLEX TYPE 7F RSB HUB B400
NEW REXNORD HUB DBZ 226 NB 616112 STEEL QD 1-1/2IN BORE
NEW PNEUMATIC SCALE PSC 209658 IDLER STEEL 6 HOLE 5/8 I
KOP-FLEX 1961820 1-1/2B SB RHUB FLEXALIGN TRANSMISSION
NEW KOP-FLEX 3B SB RHUB RIDGID GEAR 1 1/4 IN HUB B33305
NEW ATRA-FLEX M4 STEEL FLEXIBLE COUPLING RSB 1-7/8 IN H
KOP-FLEX FAST'S MODEL B STEEL COUPLING 5-1/2 IN HUB B33
NEW KOP-FLEX 1961523 TYPE 2B FHUB POWER TRANSMISSION AS
NEW TB WOODS L190 BORE JAW COUPLING 1-1/8 IN HUB B26181
NEW MARTIN ML150 5/8 JAW TYPE COUPLING HALF 5/8 IN HUB
NEW TB WOODS L190 BORE JAW TYPE COUPLING ASSEMBLY 2 IN
NEW RA JONES 133486 BLANK FEED ROLL 2IN OD 1-1/2IN THIC
NEW QM BEARING QF15S316XPB QUICK-FLEX STAINLESS COUPLIN
FALK 0253205 STEELFLEX 1070T TL 2012 COUPLING TAPER BOR
NEW STEARNS REXNORD 51611020003J 1-7/8IN BORE HUB/SS AS
KOP-FLEX 3-1/2 EB STEEL RIGID 2-1/4 IN ROUGH BORE HUB B
NEW FALK 1040G 0000400458 COUPLING 5-3/4 IN HUB B356331
KOP-FLEX SIZE 70 ELASTOMERIC SPACER COUPLING 2-3/4 IN H
KOP-FLEX 70SHUBQDXSK SIZE 70 SPACER COUPLING 2-3/4 IN H
NEW PSC 138X5478 3 IN BORE DRIVE HUB ASSEMBLY D434453
NEW FALK 033489 1050G10 LIFELIGN GEAR STEEL 7IN HUB D20
NEW WALDRON FLEXALIGN SIZE 2-1/2 COUPLING 2.872IN BORE
NEW MARTIN ML100 1 JAW HALF COUPLING 1 IN QD HUB B44702
NEW 65-1-533 STEEL 8IN OD 1-1/4 IN ROUGH BORE QD HUB D3
NEW REXNORD SR71 300 NB 1-9/16 IN COUPLING HUB B281221
NEW LOVEJOY L-150 JAW COUPLING 1-3/4 IN HUB B291992
NEW KOP-FLEX 1961598 3B FHUB FAST COUPLING HUB B332929
NEW DEMAG 71880444 COUPLING 15/16 IN ID HUB D430006
NEW CONVENIENCE FOOD SYSTEMS 4016007899 STAINLESS DISC
NEW FALK 0704618 1050T 3/8X3/16KW 1-1/2 IN HUB D253633
NEW AMERIDRIVES 073540-000FB 201.5 FINISHED BORE 1.374/
NEW NATIONAL PARTS SUPPLY 109-20021 ROLLER ASSEMBLY HUB
NEW FALK 0705011 1080T HUB 3/4X3/8 KW 2-7/8 IN BORE HUB
NEW FALK 1060T 704632 STEEL 2-1/8 IN BORE HUB D443608
LOVEJOY AL-100 COUPLER COUPLING ALUMINUM JAW STYLE TAPE
NEW SYNCHRO-ANGLE ADJUSTING 1-1/2IN BORE HUB D332671
NEW KOP-FLEX 70 SHUBTLX2517 ELASTOMERIC SIZE 70 ALUMINU
NEW RA JONES 120737 STEEL DRIVE 2-1/2IN OD 3/4IN BORE H
NEW REXNORD 5SHRB STD STRAIGHT 1-3/4IN BORE HUB D346244
NEW TB WOODS 5SC-H-1/2-MPB SPACER 1/2 IN HUB B400740
NEW MAGNALOY M40012414 MODEL 400 COUPLING QD 1-3/4 IN H
NEW GRIP MASTER GMC 8 2-3/16 2-3/16IN SPLIT BORE HUB D4
NEW 4-7/16IN OD COUPLING INSERT 2-3/8IN BORE HUB D41197
KOP-FLEX SIZE 1-1/2 SERIES H COUPLING 1-3/4IN BORE QD H
NEW FALK 70T 704640 STEEL COUPLING 1-7/8IN BORE HUB D35
NEW ALFA LAVAL 9612-51-4901 DRIVE HUB 1-5/8 IN HUB D393
NEW FALK F9 TYPE F UNBORED FOR STEELFLEX COUPLING RSB H
NEW KOP-FLEX 1960574 2 1/2 SB RHUB COUPLING GEAR ROUGH
NEW FALK 5R 3301249 0A8051 WRAP STAINLESS COUPLING 1-1
NEW KOP-FLEX 40 EHUB ELASTOMERIC COUPLING SIZE 40 ROUGH
NEW RA JONES 165646 STEEL 5/8 IN HUB D247553
NEW SEALMASTER FA0063 COUPLING STEEL 1-1/8 IN HUB D2704
NEW FALK 07-0J5360-0001 FLEX HUB 1035G KEYWAY RSB 4.497
NEW FALK 246658 STEELFLEX 1080T COUPLING RSB HUB B44531
TB WOODS L10012NK L100X1/2 NK COUPLER L-JAW TYPE ROUGH
NEW FALK 30G51 SLEEVE COUPLING 3-1/2IN BORE QD HUB D404
NEW FALK 0246655 1050T COUPLING PILOT BORE RSB HUB B400
NEW DOBOY 155962 TIMING 2-1/2X1X3/4IN HUB D275467
NEW FALK 9F UNBORED STEEL FOR F STEELFLEX COUPLING RSB
NEW FALK 704631 1060T STEELFLEX COUPLING 2 IN HUB D2534
NEW RA JONES STDAHB-308 1-1/2X2-7/16X1-?3/4IN HUB D33390
KOP-FLEX M273780 CC12082 KFM STEEL COUPLING 2-1/2 IN HU
NEW MARTIN ML110 1 5/8 JAW COUPLING 1-5/8 IN QD HUB B44
BROWNING AAH-H ANGLE ADJUSTING TAPER 1-1/2X1-5/8IN BORE
NEW FALK 30G51 GEAR SLEEVE COUPLING 2-5/8IN BORE QD HUB
NEW RA JONES STDAHB-308 STEEL 1-1/2IN BORE HUB D238986
NEW MAGNALOY 500 M50011612 1-1/2X3/8 COUPLING 1-1/2IN I
NEW KOP-FLEX 3HFHUB SERIES H GEAR COUPLING 1 IN ROUGH B
NEW STEARNS REXNORD 51611020003C 1-3/8IN HUB/SS ASSY-SP
NEW ATRA-FLEX A2 HUB 1.500 SS 1-1/2 IN BORE D436752
KOP-FLEX 30 CHUB ELASTOMERIC SPACER COUPLING SIZE 30 1
NEW M706300023 6-1-1253-2 STEEL KEYWAY 8IN OD 2-1/2 IN
KOP-FLEX 1963040 70 CHUB SPACER ALUMINUM COUPLING 1-3/8
NEW KOP-FLEX TYPE H GEAR COUPLING 1/2 IN HUB B401528