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用PLC實(shí)現(xiàn)對(duì)系統(tǒng)的控制是非常方便的。這是因?yàn)椋菏紫萈LC控制邏輯的建立是程序,用程序代替硬件接線。編程序比接線，更改程序比更改接線，當(dāng)然要方便得多！
其次PLC的硬件是高度集成化的，已集成為種種小型化的模塊。而且，這些模塊是配套的，已實(shí)現(xiàn)了系列化與規(guī)格化。種種控制系統(tǒng)所需的模塊，PLC廠家多有現(xiàn)貨供應(yīng)，市場上即可購得。所以，硬件系統(tǒng)配置與建造也非常方便。
正因如此，用可編程序控制器才有這個(gè)"可"字。對(duì)軟件講，它的程序可編，也不難編。對(duì)硬件講，它的配置可變，而且也易于變。
具體地講，PLC有五個(gè)方面的方便：
（1）配置方便：可接控制系統(tǒng)的需要確定要使用哪家的PLC，那種類型的，用什么模塊，要多少模塊，確定后，到市場上定貨購買即可。
（2）安裝方便：PLC硬件安裝簡單，組裝容易。外部接線有接線器，接線簡單，而且一次接好后，更換模塊時(shí)，把接線器安裝到新模塊上即可，都不必再接線。內(nèi)部什么線都不要接，只要作些必要的DIP開關(guān)設(shè)定或軟件設(shè)定，以及編制好用戶程序就可工作。
編程方便：PLC內(nèi)部雖然沒有什么實(shí)際的繼電器、時(shí)間繼電器、計(jì)數(shù)器，但它通過程序（軟件）與系統(tǒng)內(nèi)存，這些器件卻實(shí)實(shí)在在地存在著。其數(shù)量之多是繼電器控制系統(tǒng)難以想象的。即使是小型的PLC，內(nèi)部繼電器數(shù)都可以千計(jì)，時(shí)間繼電器、計(jì)數(shù)也以百計(jì)。而且，這些繼電器的接點(diǎn)可次地使用。PLC內(nèi)部邏輯器件之多，用戶用起來已不感到有什么限制。考慮的只是入出點(diǎn)。而這個(gè)內(nèi)部入出點(diǎn)即使用得再多，也無關(guān)緊要。大型PLC的控制點(diǎn)數(shù)可達(dá)萬點(diǎn)以上，哪有那么大的現(xiàn)實(shí)系統(tǒng)若實(shí)在不夠，還可聯(lián)網(wǎng)進(jìn)行控制，不受什么限制。PLC的指令系統(tǒng)也非常豐富，可毫不困難地實(shí)現(xiàn)種種開關(guān)量，以及模擬量的控制。PLC還有存儲(chǔ)數(shù)據(jù)的內(nèi)存區(qū)，可存儲(chǔ)控制過程的所有要保存的信息。……總之，由于PLC功能之強(qiáng)，發(fā)揮其在控制系統(tǒng)的作用，所受的限制已不是PLC本身，而是人們的想象力，或與其配套的其它硬件設(shè)施了。
PLC的外設(shè)很豐富，編程器種類很多，用起來都較方便，還有數(shù)據(jù)監(jiān)控器，可監(jiān)控PLC的工作。使用PLC的軟件也很多，不僅可用類似于繼電電路設(shè)計(jì)的梯形圖語言，有的還可用BASIC語言、C語言，以至于自然語言。這些也為PLC編程提供了方便。
ALFA LAVAL SERVO DRIVE 31830-3350-1
ALFA LAVAL,2" 1X1 PLUG VALVE,STAINLES?S STEEL
Alfa Laval Think Top Replacement Control Top
45BY-3-02-SFY SPRINGER PARTS FOR ALFA LAVAL VALVES - BALL - OEM P/N 620377
ALFA LAVAL CPM-D-60-GC-?3 POL CONSTANT PRESSURE MODULATING INLET VALVE-NEW
882303760 CPM-I-D60 WITH MANUAL AND CONFORMITY CERT!!!
ALFA LAVAL FLOW SWITCH NSN 5930-01-448-26?32 NEW
ALFA LAVAL A3 PLUG VALVE 4"
TRI-CLOVER ALFA LAVAL BUTTERYFLY 3 WAY SHUTTER VALVES AIR OPERATED ETC
ALFA LAVAL SERVO DRIVE SS5
Alfa Laval Saunders DN 50 Valve
41212 Old-Stock, Alfa Laval Seperation 98 01 B Liner, 7-11/16" ID, 21-9/16" OD
SS ALFA LAVAL 1-WAY A3 PLUG VALVE 2"
45BY-3-02-SFY SPRINGER - BALL - ALFA LAVAL P/N 620377 VALVE REPLACEMENT BALL
Alfa Laval Refrigerant Heat Exchanger Type CB14-14H
ALFA LAVAL FILTERING DISK, FLUID PART # 1800-03365 NSN: 4330-14-479-43?89
ALFA LAVAL,PN10,1X1 2" PNUEMATIC VALVE,STAINLES?S STEEL
Alfa Laval Refrigerant Heat Exchanger, Model: CB76 - 40H S54
Alfa Laval Saunders Diaphragm Valve DN50 1.75" 34598 SS
Alfa Laval Saunders DN 25 Valve
2 Inch Tri Clamp Diaphram Valve Alfa Laval Saunders Stainless Steel USDA/A3/3A
ALFA LAVAL,SRC-W-3A?-2.5-9-20H W/HD SPRING,PLUG VALVE
45BY-21/2-02-S?FY SPRINGER - BALL - ALFA LAVAL P/N 620262 VALVE REPLACEMENT BALL
1.5 Inch Tri Clamp Diaphram Valve Alfa Laval Crane Saunders Stainless Steel 316L
1.5 In Valve Tri Clamp Alfa Laval Saunders Diaphram Stainless Steel 316L
ALFA LAVAL,SRC-W-3A?-2.5-7-20H W/HD SPRING, VALVE
Alfa-Laval model NB26-34H brazed plate heat exchanger
Alfa Laval Saunders EC Piston Actuator
ALFA LAVAL SAUNDERS EC PISTON ACTUATOR
ALFA LAVAL LKLA PNEUMATIC VALVE WITH 2 1/2" BUTTERFLY
ALFA LAVAL,3"X 3"- 4" STAINLESS STEEL PNUEMATIC VALVE
Alfa Laval Heat Exchanger
Alfa Laval 10939820 Refrigerant Heat Exchanger
Caterpillar/Al?faLaval Plate Heat Exchanger Plate As-New
TRI-CLOVER AIR OP VALVE SANITARY ALFA LAVAL
New Alfa Laval A10b Heat Exchanger Channel Plate 304 SS
Saunders - Via Alfa Laval air actuator
2090-CPBM7DF-10AF01
GENUINE APC Symmetra Replacement Battery SYBTU1-PLP C10 NEW for SYBT4
Intel FPPUPS120 APC AX150UPS-120P Rack-Mount UPS
APC Smart-UPS SMT1000RM2U 1000VA Rack-mountable UPS SMT1000RM2U
APC Smart-UPS SUA1500US 1500VA 1500VA TWR 120V LIN
Agilent / HP 11857D Test Port Cables, APC-7, 50 Ohms (matching). Warranty.
NEW APC SUA1500I Smart Standalone Power Supply with Serial & Usb Port - 8 outlet
APC Cabinet W/AP9607 UPS Interface Exp. Mod#2200 Clean
APC NETSHELTER 42U AR2101BLK BLACK RACK SERVER CABINET look call for details
APC AP8941 Rack PDU 2G, Switched, ZeroU
APC Smart-UPS SMT1500RM2U 1440VA 1 kW Rack-mountable UPS 0.12 Hour Full Load USB
Used APC Smart-Ups 1500 SAU1500 980W
200 APC Signaling UPS USB to RJ45 RJ50 Enthernet Cable
200 APC Signaling UPS USB to RJ45 RJ50 Networking Cable
APC Smart-UPS 1000VA SUA1000RM1U
SMX1000 Smart-UPS X 1000VA Rack/Tower American Power Conversion-APC
GXT1500RT-120 Liebert 120V Eight Outlet UPStation!
APC Symmetra Replacement Battery Cartridge SYBT2 NEW
SYMIM5 Symmetra LX Intelligence Mod American Power Conversion-APC
APC 48V EXTENDED BATTERY PACK (UPS) RM TOWER-SMART UPS X SERIES P/N SMX48RMBP2U
APC Smart-UPS 1500VA Tower UPS SMT1500
APC SUA1500R2X138 Smart UPS 1500VA 120V
APC SUA1500US 1500VA Smart-UPS 120V NAFTA
APC 1MRF28H54BV MRF 2800 RECTIFIER
Agilent 11857D 50 ohm APC-7 Test Port Cable for 8753D/E
APC Smart-UPS 1000 VA Tower 670W 6.1 Minute Full Load SMT1000 6.1 Min Full Load
APC Smart-UPS 3000 XLM SUM3000RMXl2U Rackmount UPS System
APC Symmetra RM 8-12kVA Battery Module Hot-swappable SYBT3
APC SMT1500RM2U Smart-UPS 1500VA LCD RM2U 120V
5131:APC-Ameri?can Power Conversion:SU5?000RMT5U:Misc:?Power Supply
APC AICHI PUMP MC-32S4L NSFP MC32S4L
APC AP7932 Rack PDU Switched, Zero U 30A
ROHL PERRIN ROWE U.3531X-APC TUB FILLER TUB CHROME NEW
Agilent / HP 11857D Test Port Cables, APC-7, 50 Ohms. Warranty.
NEW AKAI APC40 ABELTON CONTROLLER AND SOFTWARE FOR PRO DJ CLUB STAGE MUSICIANS
APC SMX1000 Smart-UPS 800 Watts 1000 VA 120V 2U Rack Tower LCD System
APC SYMIM5 Symmetra LX Intelligence Mod
APC SUA1000 USPP SUA1000
APC RBC12 SmartUPS Replacement Battery Cartridge (2200/3000/500?0)
APC SmartUPS Replacement Battery Cartridge SU1000/SU3000/?SU5000 RBC44 NEW
APC NO:640-0734G PC BOARD REV-8 {ITEM TAKEN OUT OF NEW PRODUCT}
2090-CPBM7DF-10AF01
IDEC APW199DY USPP APW199DY
APW MCLEAN TEG10 NSPP TEG10
APW MCLEAN TEG10 USPP TEG10
IDEC APW299D-S-24V NSPP APW299DS24V
IDEC APW-299D-R-120?V NSPP APW299DR120V
TEXAS INSTRUMENTS SEMI SN74LVCC3245AP?W FNFP SN74LVCC3245AP?W
IDEC APW-199R24V USPP APW199R24V
IDEC APW299D-A-24V USPP APW299DA24V
IDEC APW299D-Y-24V NSFP APW299DY24V
IDEC APW299D-Y-24V USPP APW299DY24V
IDEC APW1126S USPP APW1126S
IDEC APW-199 NSFP APW199
IDEC APW-199 NSPP APW199
IDEC APW-199 USPP APW199
IDEC APW199D-A-120V NSFP APW199DA120V
IDEC APW199D-A-120V NSPP APW199DA120V
IDEC APW199D-A-120V USPP APW199DA120V
IDEC APW199D-G-120V NSFP APW199DG120V
IDEC APW199D-G-24V NSFP APW199DG24V
IDEC APW199D-G-24V USPP APW199DG24V
IDEC APW199D-R-120V NSFP APW199DR120V
IDEC APW199D-R-120V NSPP APW199DR120V
IDEC APW199D-R-120V USPP APW199DR120V
IDEC APW199D-R-24V NSFP APW199DR24V
IDEC APW199D-R-24V USPP APW199DR24V
IDEC APW199D-S-24V NSFP APW199DS24V
IDEC APW199D-W-120V NSFP APW199DW120V
IDEC APW199D-W-120V USPP APW199DW120V
IDEC APW199-G-120V NSFP APW199G120V
IDEC APW199-G-120V USPP APW199G120V
IDEC APW2126G USPP APW2126G
IDEC APW299D-G-120V NSFP APW299DG120V
IDEC APW299D-G-120V NSPP APW299DG120V
IDEC APW299D-G-120V USPP APW299DG120V
IDEC APW-299D-R-120?V NSFP APW299DR120V
IDEC APW-299D-R-120?V USPP APW299DR120V
IDEC APW299D-W-120V NSFP APW299DW120V
IDEC APW299D-W-120V USPP APW299DW120V
IDEC APW2LD-G NSFP APW2LDG
IDEC APW299-E-R-120?V NSPP APW299ER120V
IDEC APW299-E-R-24V NSPP APW299ER24V
IDEC APW299DW6V USPP APW299DW6V
IDEC APW1126D-A NSFP APW1126DA
IDEC APW1126D-A USPP APW1126DA
TEXAS INSTRUMENTS SEMI SN74LVCC4245AP?W FNFP SN74LVCC4245AP?W
2090-CPBM7DF-10AF01
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