本特利125800-01               

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PLC的接線包括輸入接線和輸出接線。輸入接線的長度不宜過長，一般不大于30m；在線路距離較長時，可采用中間繼電器進(jìn)行信號的轉(zhuǎn)換。輸入接線的COM端與輸出接線的COM端不能接在一起。輸入接線與輸出接線的電纜應(yīng)分開設(shè)置。必要時，可在現(xiàn)場分別設(shè)置接線箱。集成電路或晶體管設(shè)備的輸入信號和輸出信號的接線必須采用*電纜；*層的接地端應(yīng)為一點(diǎn)接地，接地點(diǎn)宜在控制器側(cè)。

    1.4 冗余設(shè)計(jì)和降級操作設(shè)計(jì)

    1) 對可靠性要求較高的應(yīng)用場合，冗余設(shè)計(jì)和降級操作是必要的。冗余設(shè)計(jì)可采用熱后備或冷后備方式。熱后備方式操作時，冗余的后備系統(tǒng)也同時運(yùn)行，兩者輸出的結(jié)果一致時，表示系統(tǒng)是正常運(yùn)行的；一旦結(jié)果不一致，則發(fā)出警報信號，同時，根據(jù)自診斷的結(jié)果，切換到正常的系統(tǒng)去。冷后備方式操作時，冷后備系統(tǒng)不運(yùn)行，它在自診斷檢測出運(yùn)行系統(tǒng)故障后才切入后備系統(tǒng)。對PLC來說，冗余系統(tǒng)的范圍主要是CPU、存儲單元、電源系統(tǒng)和通信系統(tǒng)，只有在可靠性要求很高時，才會包括輸入輸出單元的冗余等。

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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