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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。
FLOWSERVE DURCO MARK 3 SELF PRIMING PUMP W/ BALDOR 5HP MOTOR
EBARA PUMP 22KW CENTRIFUGAL PUMP 100X80FS2G 622
GUSHER PUMPS 106GPM CENTRIFUGAL PUMP P2X2.5-7SEHCBM4?B W/ BALDOR 15HP AC MOTOR
AHLSTROM 288FT 2170GPM 1780RPM 6" X 10" CENTRIFUGAL PUMP TLS-15
NASH 450RPM VACUUM PUMP SIZE CL2003
PIAB X10 VACUUM PUMP 32 01 084 NIB
SMC FITTINGS IN-289-1663 NIB 10 IN BAG
WARREN RUPP SANDPIPER SB2-A AIR-POWERED DOUBLE DIAPHRAGM PUMP
STONEL 2VES-356 QUARTZ MQ
ITT
WARREN PUMP POWER END, NO LABEL, LISTING #2
GOULDS PUMPS INC. 4 X 12 - 14 CENTRIFUGAL PUMP 3135
LMI MILTON ROY NSF 120V 1.4A METERING PUMP A1?1-151
INGERSOLL RAND 4X3X6 PUMP W/ US MOTORS 254JM 3PH 3540RPM 15HP MOTOR UNIMOUNT 125
WOODWARD GOVERNOR TYPE PG-PL PUMP CONTROL 8552-674, NEW
ROOTS DRESSER VACUUM DISPLACEMENT BLOWER 36 U-RAI
WARREN RUPP 1IN SA1-A SANDPIPER DIAPHRAGM PUMP DN-1-A
PARKER BARB HOSE ELBOW QUICK DISCONNECT FITTING P300 SERIES LOT OF 4
PROCO EXPANSION JOINTS 4"X 5" 240-E/NP SEALED
MONARCH HYDRAULICS DYNA-PACK PUMP M-4-4
DADCO GAS SPRING REPAIR KIT 90.10.00750 *NEW*
BECKER 175-254/300-440?V 6.0/3.5A 1430/1720MIN-1 VACUUM PUMP MOTOR D 80 BY 4 P 3
BELL & GOSSETT 1200GPM, 15HP, 175PSI SERIES 1510 CENTRIFUGAL PUMP BF 7.500 6BC
AURORA PUMP COMPANY 208-230/460V, 60Hz, 1/3HP, PUMP 952-0891-940
GRACO 10GPM, 120PSI, 3-1 RATIO SERIES A88A PUMP W/ AIR MOTOR 210-007
GOULDS PUMPS, INC. G&L SERIES SSV 15HP INLINE VERTICAL PUMP 3SVBK13 99374
AHLSTROM 44FT 1086GPM 1180RPM 6" X 8" CENTRIFUGAL PUMP TLN-15
OILGEAR HYDRAULIC FIXED DISPLACEMENT PISTON PUMP VJPFX-3125-35, NEW
WARRICK 120VAC, 20A, 1/3HP, 140oF TILT FLOAT SWITCH, F-BLU-20-T SER.F
GUSHER PUMPS P1.5X2-10SEH-CC?-A GENERAL SERVICE IND PUMP W/ BALDOR 7? HP MOTOR
INGERSOLL DRESSER WORTHINGTON CENTRIFUGAL PUMP 3X2X13
PUMPENFABRIK GEAR PUMP WITHOUT MOTOR 7300B/FX/SA5
IMO INDUSTRIES INC. G3DBC-250 POSITIVE DISPLACEMENT PUMP 3215/152
EAGLE STARS NCF-NO.3 ROLLING CENTER TO 2112
SUNDSTRAND SUNFLO P-2000 HIGH PRESSURE PUMP P2-CKR
VARIOUS ASSORTMENT OF CLAMPS FOR DIAPHRAGM PUMPS, LOT OF 24
DAYTON DIAPHRAGM PUMP 1" 6PY48
FMC TECHNOLOGIES M06 PLUNGER PUMP M0612DI
PULSAFEEDER HYDRACONE R1 DIAPHRAGM METERING PUMP W/ 1/4HP MOTOR 102358
BUSCH VACUUM PUMP SV 1063 B 003
GRUNDFOS SH SEAL KIT MTR 32/45/65 EUUV *NEW
GOULDS IMPELLER PUMP 1 750 9MBL 0VXP1C1 102299
GORMAN RUPP T-SERIES SELF-PRIMING PUMP T6A3-B
TEIKOKU 135 GAL./MIN. 3PH 17.8KW MOTOR PUMP RW42-2415H4XM-0?506TL1-A 99147
BELL & GOSSETT 2400GPM, 75HP, 175WP SERIES 1510 CENTRIFUGAL PUMP BFE 11.250 8G S
LEYBOLD HERAEUS 5HP ROOTS VACUUM PUMP WA 1000M / 89513
PULSAFEEDER 90PSIG 1445GPH DIAPHRAGM METERING PUMP MODEL 8480-S-AE
FUJI ELECTRIC 200/220V 1.2/1.5A 3-PHASE ELECTRIC OIL PUMP, VKP081J
EBARA PUMP 3.7KW CENTRIFUGAL PUMP 65X50FS2F 63.7
GP 5-VANE PUMP IMPELLER 54017
INLAND 4 PIECES VACUUM PUMP FLUID 19 NIB
KAWASAKI K3VL45/A-10RKS-?P0 SWASH-PLATE AXIAL PISTON PUMP
VICKERS VANE PUMP 1AA20 282, USED
MKS/HPS NW40 WING NUT CLAMP 100312905 LOT OF 2
NASH 450RPM VACUUM PUMP SIZE CL2003
TEIKOKU 11 GAL./MIN. 3PH 8.4KW MOTOR PUMP RW42-2341H4XM-0?405TL1-A 99139
PUMP IMPELLER 55437 / 9064T
PEERLESS PUMP COMPANY 11 CASE GASKETS V1773A NIB
VICKERS 208-230/460V 3HP MOTOR HYDRAULIC POWER UNIT 02-115663
UNKNOWN MFG * GRADE 8 QTY 25 FIN HEX NUT * 5/8-11
BECKER 175-254/300-440?V 6.0/3.5A 1430/1720MIN-1 VACUUM PUMP MOTOR D 80 BY 4 P 3
CHESTERTON PUMP SHAFT SEAL KIT 123-1E-28 SA CB/TP NIB
SPECK-PUMPEN VACUUM PUMP WITH MOTOR 7643804X/L07, BC
AP AURORA 6GPM 23' HEAD CENTRIFUGAL PUMP 323BF W/ MARATHON 1HP AC MOTOR, UNUSED
INGERSOLL RAND 4X3X6 PUMP W/ US MOTORS 254TC 3PH 3500RPM 15HP MOTOR 9400651-283
NEPTUNE SERIES 500-E 2.0GPH DIAPHRAGM PUMP 520-E-N3 CORD W/ 1/3HP TEFC MOTOR
ORION DRY-PUMP KD1500 301 W/SUPER LINE 3-PH 90L FR 1.5KW INDUCTION MOTOR SF-JRV
VICKERS VANE TYPE HYDRAULIC PUMP 45V 60A / 1C 12L180
GOULDS PUMPS 43MM I.D. 68MM O.D. PARTS SHAFT ASSY KIT, Z196-SFTMT *NEW SEALED*
GRUNDFOS 220V CLASS-F CIRCULATING PUMP UP 20-32 N
MICRO GEN EQUIPMENT CHEMICAL MISTER 6-77
DROPSA 110V 50/60HZ ELECTRIC MICRO PUMP 3417060 *NEW*
BUSCH VACUUM PUMP RA0025-E506-100?1 W/ TOSHIBA 1.5HP AC MOTOR BY154FLB2UMW, NEW
MOYNO PUMP A2E SS03 APA AS2122396 YK
NASH 640RPM VACUUM PUMP SIZE CL 2003
WILDEN DIAPHRAGM PUMP P200/AAPPP/WFS/?WF/ATF/0730, CRACK 99875
FLACO AM 4/F/200 PNEUMATIC FUEL PUMP 40 512 050
SCHMALENBERGER THK 12 32-08/2 MULTISTAGE CENTRIFUGAL PUMP, 6.6 kW
EBARA PUMP 7.5KW PUMP 65X50FS2H 67.5 / P02708529
WILDEN PUMP M2/TO/TF/TF/AT
PULSATRON E PLUS SERIES ELECTROMAGNETIC METERING PUMP LPB3SA-PTC1-XXX
ENERPAC 1PH 120V 25A 1-1/2HP PORTABLE PUMP MODEL EER6422
PARKER FLOW CONTROLW BRASS VALVE XFC701-8-8 NIB
PFEIFFER VACUUM TURBOMOLECULAR DRAG PUMP PM P02 130 / TMH 260
EBARA PUMP 7.5KW PUMP 65X50FS2H 67.5 / RW061707-01
GARDNER DENVER * SIZE 3006 AIR PUMP BLOWER * 182554
WILDEN PUMP DIAPHRAGM PUMP PX8/WWAA/WFS/WF?/WF 100152
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