本特利133396-01                   

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   隨著PLC在工業控制中的推廣普及，PLC產品的種類越來越多，其結構型號、性能、容量、指令系統、編程方法等各不相同，適用場合也各有側重。因此，合理選擇 PLC，對于提高PLC在控制系統中的應用有著重要作用。
   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上發展起來的微機技術和繼電器常規控制概念相結合的產物。從廣義上講，PLC是一種計算機系統，比一般計算機具有更強的與工業過程相連接的輸入輸出接口，并已成為自動化控制系統的基本裝置。PLC已經廣泛應用于機械、冶金、化工、汽車、輕工等行業中，已基本取代了傳統的繼電器和接觸器的邏輯控制。用PLC來控制系統設備，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，據稱其平均無故障時間已達30萬小時。所以，整個PLC控制系統的可靠性，主要取決于PLC的外圍設備，比如輸入器件中的行程開關、按鈕、接近開關，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控的程序，對提高系統的可靠性也有很大好處。下面就如何提高PLC控制系統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