本特利125768-01               

詢價(jià)熱線電話`1 8 0 5 0 0 3 6 9 4 5 `】【詢價(jià)座機(jī)--0592-6808374 】【詢價(jià)QQ :3443643092 】 

   

  1) 由于PLC是通過(guò)輸入電路接受開(kāi)關(guān)量、模擬量等輸入信號(hào)，因此輸入電路的元器件質(zhì)量的好壞和連接方式直接影響著控制系統(tǒng)的可靠性。比如：按鈕、行程開(kāi)關(guān)等輸入開(kāi)關(guān)量的觸點(diǎn)接觸是否良好、接線是否牢固等。設(shè)備上的機(jī)械限位開(kāi)關(guān)是比較容易產(chǎn)生故障的元件。在設(shè)計(jì)時(shí)，應(yīng)盡量選用可靠性高的接近開(kāi)關(guān)代替機(jī)械限位開(kāi)關(guān)。此外，按鈕的常開(kāi)和常閉觸點(diǎn)的選擇也會(huì)影響到系統(tǒng)的可靠性?，F(xiàn)以一個(gè)簡(jiǎn)單的起動(dòng)、停止控制線路為例，如圖2和圖3所示的是兩個(gè)控制線路和它們的對(duì)應(yīng)梯形圖。這兩個(gè)控制線路的控制功能完全一樣，按下起動(dòng)按鈕，輸出動(dòng)作；按下停止按鈕，輸出斷開(kāi)；但它們的可靠性不一樣。我們假設(shè)輸出斷開(kāi)為安全狀態(tài)，那么圖3的可靠性要比圖2的高。這是因?yàn)?/span>SB1、SB2都有發(fā)生故障的可能，而最常見(jiàn)的現(xiàn)象是輸入電路開(kāi)路。當(dāng)采用圖3電路時(shí)，不論SB1、SB2開(kāi)關(guān)本身開(kāi)路還是接線開(kāi)路，輸出都為安全狀態(tài)，保證了系統(tǒng)的安全和可靠。

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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