本特利128229-01                   

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   隨著PLC在工業(yè)控制中的推廣普及，PLC產(chǎn)品的種類越來越多，其結(jié)構(gòu)型號、性能、容量、指令系統(tǒng)、編程方法等各不相同，適用場合也各有側(cè)重。因此，合理選擇 PLC，對于提高PLC在控制系統(tǒng)中的應(yīng)用有著重要作用。
   可編程序控制器（以下簡稱PLC）是在程序控制器和微機控制器的基礎(chǔ)上發(fā)展起來的微機技術(shù)和繼電器常規(guī)控制概念相結(jié)合的產(chǎn)物。從廣義上講，PLC是一種計算機系統(tǒng)，比一般計算機具有更強的與工業(yè)過程相連接的輸入輸出接口，并已成為自動化控制系統(tǒng)的基本裝置。PLC已經(jīng)廣泛應(yīng)用于機械、冶金、化工、汽車、輕工等行業(yè)中，已基本取代了傳統(tǒng)的繼電器和接觸器的邏輯控制。用PLC來控制系統(tǒng)設(shè)備，其工作的可靠性要比單純繼電器和接觸器控制大大提高。就PLC本身而言，平均無故障時間一般已可達3~5萬小時；而三菱的F系列，據(jù)稱其平均無故障時間已達30萬小時。所以，整個PLC控制系統(tǒng)的可靠性，主要取決于PLC的外圍設(shè)備，比如輸入器件中的行程開關(guān)、按鈕、接近開關(guān)，輸出器件中的接觸器、繼電器和電磁閥等。另外，從軟件程序的編制來考慮，如果能編制出一個帶有監(jiān)控的程序，對提高系統(tǒng)的可靠性也有很大好處。下面就如何提高PLC控制系統(tǒng)的可靠性進行一些探討。

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LADISH 2" 275PSI@100°F CHECK VALVE 8273-0714-20B
 
HonEYWELL SKINNER VALVE 120 VOLTAGE A 3 LB 2 127AB96A46 NIB
 
POWELL VALVE 3/4" 1975PSI@100°F GLOBE VALVE GL08SA58GB
 
FLOWSERVE ULTRASWITCH W/ COMPACT ACTUATOR C25 SR-2C IMP & 1IN 150 CF8M VALVE
 
CAT PUMP VALVE KIT 33835
 
AUTOMATIC VALVE 10BAR 150PSIG PNEUMATIC SOLENOID VALVE 413B65S31C-DB7
 
SMC 3 VALVE MANIFOLD base PLASTIC THREAD AT END CRAKCED
 
MAXON 3/4" 125 PSIG SHUT-OFF VALVE, 5000-0
 
SMC 0-0.5MPA 1" NPT SOLENOID PROCESS VAVLE V0307-5TZ
 
FAIRBANKS 8" GATE VALVE 104043
 
NUMATICS 24VDC 6W SOLENOID VALVE 030SA446E000061?/236-115B
 
NORGREN 30-150PSI 1/4"NPT SOLENOID VALVE 375-02-007-32-0?2/00 *NNB*
 
PARKER * ConTROL SOLENOID VALVE * D3W1B56Y
 
GRACO VALVE SERVICE KIT 560-001-960 *NEW*
SMC 0-0.5MPA 1" NPT SOLENOID PROCESS VAVLE V0307-5TZ
 
FAIRBANKS 8" GATE VALVE 104043
 
NUMATICS 24VDC 6W SOLENOID VALVE 030SA446E000061?/236-115B
 
PARKER * ConTROL SOLENOID VALVE * D3W1B56Y
 
GRACO VALVE SERVICE KIT 560-001-960 *NEW*
 
ARMSTRONG THERMOSTATIC STEAM TRAP D1175-5 NIB
 
SMC SOLENOID VALVE VP3145-045DZB1-?NSW/2 225-344B
 
FABRI-VALVE 150CWP S316 10" KNIFE GATE VALVE F440745 67
 
NUMATICS 1/4"NPT REGULATOR VALVE NO GAUGE I34RD100J0503K0?0
 
SHICK 8" I.D. 11" O.D. STAINLESS STEEL ROTARY VALVE T-224
 
PARKER DIRECTIonAL VALVE D1VW001CVYCF4
 
ROSS ConTROLS 150 PSIG 1-1/4" NPT PILOT OPERATED CHECK VALVE, 2751B7901 NNB
 
SMC 26V .15-1.0MPA SOLENOID VALVE NVFS2400 *NEW*
 
BOSCH 1700PSI PRESSURE REDUCING VALVE 0 811 145 115 *NEW*
 
WATTS REGULATOR 600 PSI 3/4" NPT BRASS BALL VALVE, B-6800
 
VICKERS ALUM VALVE HOUSING 23035 REV. 3
 
APOLLO 1/2" LOCKING BALL SHUT OFF VALVE 70-103-27
 
TOYO-OKI WHD3A-D-V30-BCA?-025A-S1D VALVE W/ TOYOOKI ECAD-MS-S1D
 
ACCUTRAK 1040 DUAL DISPLAY W/ 3" OPEN/CLOSE 2KE VALVE 104357
 
metaLWORK PNEUMATIC REGULATOR VALVE
 
NUMATICS 150PSI DOUBLE SOLENOID VALVE 152JJ441O000000 *NEW*
 
WILKERSON 3/8" PORT / 3/4" THREADS SOLENOID VALVE N28-06-0C00
 
METREX VALVE WATER REGULATING VALVE 50-250PSI
 
PARKER 120/110V, 60/50HZ, .72-.75A, 3000 PSI, DIRECTIonAL ConTROL VALVE D3W1HNYC
 
SMC/ FLC 3/8"NPT FLOW SWITCH W SOLENOID VALVE AND PLUG ATTACHMENT L-61456/VX2330
 
WANDFLUH SOLENOID VALVE P135V-M40 NIB
 
NUMATICS 150PSI SOLENOID VAVLE 554JK43AO *NEW*

FLOWSERVE DURA SEAL PUMP SEAL CARTRIDGE GKB2135501B NIB

 

MODULAR DIVIDER VALVE SUB-PLATE NPSF

 

NUMATICS SOLENOID VALVE 11DSA-4410

 

SMC PNEUMATIC VALVE VHS4500-03

 

NUMATICS 150PSIG PNEUMATIC SOLENOID VALVE 031SA446C000030 / 237-958B NIB

 

NUMATICS 150PSIG PNEUMATIC SOLENOID VALVE ISO5599/11 / 134BB400KP

 

ARMSTRON MACHINE WORKS AM-91 STEAM HUMIDIFIER, NNB

 

DELTROL ConTROLS 24VDC 6.5W 90PSI SOLENOID VALVE DSV28-090-A08F-?P91 99344

 

SERVICE FIRST THERMO EXPANSION VALVE VAL04911 NIB

 

NORGREN 0-60PSI 0-4.0BAR PRESSURE GAUGE

 

PARKER 24VDC 3.0A 5000 PSI HYDRAULIC SOLENOID VALVE, D1FXE01FCVDJ004?0 NNB

 

ROSS PORT RIGHT ANGLE PO CHECK VALVE 1958A1010 NNB

 

HUNT VALVE COMPANY 150PSI, 250PSI FLO-DIRECTOR VALVE MODEL 43

 

ASCO MP-C-080 / 238210-032D SOLENOID VALVE COIL

 

MAC 15W 120/40V PNEUMATIC SOLENOID VALVE 250B-181CAAA

 

MAC VALVE REPAIR KIT K-09001C

 

REXROTH PNEUMATIC VALVE NIB 0820 402 046

 

LUBRIQUIP SHUT-OFF VALVE 527-005-180

 

ASCO SOLENOID VALVE 8551A001MS 99686

 

NUMATICS 150PSIG PNEUMATIC SOLENOID VALVE 031SA400C / 237-958B NIB

 

ROSS 20.7BAR MAX LINE FILTER REGULATOR 5211B5027 100070

 

UNKNOWN MFG * EASY READ VALVE * EF 35 B

 

JAMESBURY 18" BUTTERFLY VALVE ACTUATOR ST-1800 MOD. A

 

ASCO SOLENOID VALVE 120/60 MP-C-080 272610-132-D

 

SUN HYDRAULICS 1000PSI RPEC FAN RELIEF VALVE 89341 71110 NIB

 

SUN HYDRAULICS VAVLES 60069-C NIB

 

JAMESBURY ST-400B ACTUATOR 8" 316SS BUTTERFLY VALVE 815W-11-3600-MT W/ P-2000

 

NUMATICS 120V .11A 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, 152SA400K

 

NUMATICS 150PSIG SOLENOID VALVE 237-1008B / 237-1011B / 031SS6002000030

 

NUMATICS 120V .16A 50/60HZ 150 PSIG-AIR SOLENOID VALVE, 33DSP4410 *REPAIRED*

 

NUMATICS 110/120V .37A 150 PSIG-AIR SOLENOID VALVE W/ base, I35SA43BK066E30

 

BOSCH 4500PSI 315BAR PRESSURE REDUCING VALVE 0 811 150 234

 

ASCO 110/120V 25PSI SOLENOID VALVE 821BB 0