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1.4 冗余設計和降級操作設計
1) 對可靠性要求較高的應用場合，冗余設計和降級操作是必要的。冗余設計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)也同時運行，兩者輸出的結(jié)果一致時，表示系統(tǒng)是正常運行的；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)不運行，它在自診斷檢測出運行系統(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。
2) 降級操作是指在設計時，將手動操作包括在內(nèi)的設計。例如，緊急停車的設計，關(guān)鍵設備的開停和再啟動功能的設計等。這樣，一旦發(fā)生故障，可采用降級的操作，即對部分或全部設備進行手動的開停操作，以避免設備的損壞或?qū)θ藛T的傷害。此外，在設計中也可考慮從全自動到半自動、直至手動的操作等。
NORTHMAN FLUID POWER /VICKERS HIGH PRESSURE VANE PUMP 45VQ-60-A-1-A-2?0
WARREN PUMP POWER END 12-E-20
PFEIFFER TURBO PUMP TPH 062 NIB
PULSATRON C PLUS SERIES ELECTROMAGNETIC METERING PUMP LD03SA-PTC1-XXX
GOULDS 3180 XL PUMP SUCTION SIDE PLATE, 12 X 14 - 22
GRACO 8 STAGE IMPERIAL CENTRIFUGAL PUMP 210-508
BECKER 50/60HZ CLASS F OIL-LESS PUMP VACUUM D 71 B4 P
TRI-ROTOR, INC VARIABLE VOLUME PUMP 100CV
JOHN CRANE SAFEUNIT WATER PUMP FILTER 0105
DAYTON CAST IRON CENTRIFUGAL SEWAGE TRASH PUMP W/ MOTOR
AHLSTROM IMPELLER TPP-25 / 0030
BRUENINGHAUS HYDROMATIK HYDRAULIC PUMP A10V O100 DFR1/31R-PSC62N?00
GOULDS PUMPS INC. 460V 1725RPM 1HP SUBMERSIBLE PUMP WS1034BF
PULSAFEEDER PULSAR 25H HYDRAULIC DIAPHRAGM METERING PUMP 25HJ *LISTING #2*
SULZER 114FT 271GPM 1740RPM CENTRIFUGAL PUMP APT 23-2
GOULDS PUMPS INC. 208/230V 1750RPM 1HP SUBMERSIBLE PUMP WS1032BF
BECKER 50/60Hz, 202-300/350-520?V, VACUUM PUMP D 71 B 4 P, 22250296
VICKERS MOBILE PUMP 2520V21A14
VICKERS VANE PUMP 2520V 21AI2 IAA20 282
POWER STEERING PUMP HBD-AA
EBARA PUMP 15KW CENTRIFUGAL PUMP 80X65FS2G 615
ITT BELL & GOSSETT CENTRIFUGAL PUMP
ARO INGERSOLL-RAND 150 PSI INLET 300 PSI OUTLET PISTON PUMP ASM, 650110-1C, NIB
SHANLEY PUMPS GEAR PUMP SMDBA B 80 R46, REPAIRED
SIHI SIEMEN & HINSCH mbH SUPER NOVA HOT WATER PUMP ZLKC 40200/AKAAEOB 20A
GOULDS PUMPS 316SS 1200RPM 14X14-22H PUMP POWER END MODEL 3175
GUSHER RUTHMAN RL-L-CM COOLAN PUMP W/ ? Hp MOTOR
GORMAN-RUPP 80 SERIES SELF-PRIMING CENTRIFUGAL PUMP 83A52-B, CRACKED
FLOWSERVE MECHANICAL SEAL EEKB2646921
ROTO-JET PUMP 30GPM 1536FT PUMP K11A-3DS W/ GE 1755RPM 7.5HP MOTOR 5KS213SS208A
NIKKISO CHEMIPON 1470/1760RPM, 4POLE PHASE INDUCTION MOTOR & PUMP BA20 SERIES B
ALEMITE CORPORATION 9660-A X6 LOW PRESSURE PUMP, NIB
MILLER VANE PUMP QM40030VHRSCS
GUSHER PUMP 11022E-XLONG-RH VERTICAL END SUCTION CENTRIFUGAL PUMP, 5 HP, NNB
EBARA PUMP 18.5KW CENTRIFUGAL PUMP 80X65FS2H 618
BELL & GOSSETT 40HP SERIES 1510 CENTRIFUGAL PUMP 6E 11 BF
HARTMANN PVX SER. PVX SER. PVX9144/3-CKXXX?-20FL/FG-PCXXXX 74039-059
LUTZ PUMP INC. PORTABLE PUMP MOTOR
RACINE * PUMP * 60896
IWAKI CO. 100-240V METERING PUMP W/ CONTROLLER EHNC-CR
GUSHER MULTI-STAGE CENTRIFUGAL PUMP MSC5-9-2000CBM-?A W/ 20HP BALDOR MOTOR
HEDLAND FLOW-ALERT FLOW METER 3000PSI
BRUENINGHAUS HYDROMATIK DISPLACEMENT PUMP 00938804
VIKING SPUR GEAR PUMP SG-0535-G04 U851213
MDC MANUFACTURING HINGED CLAMP 701003 NIP
PULSAFEEDER PULSAR 25H HYDRAULIC DIAPHRAGM METERING PUMP 25HJ *LISTING #1*
VICKERS EATON DOUBLE HYDRAULIC VANE PUMP 2520VQ21A11
OILGEAR HIGH PRESSURE HYDRAULIC PUMP PVWH60RDFYCLNNT?KCP
MARATHON ELECTRIC 200HP, 2780RPM, 445TDZ
GRACO MESH FILTER ELEMENT 108-112
FLOWSERVE PUMP DIVISION PUMP SEAL 84M040SA 104770
HELICAL PRODUCTS FLEXIBLE SHAFT ARM112-12MM
KAWASAKI K3VL45/A-188RKS?-R0 SWASH-PLATE AXIAL PISTON PUMP
TECHNOVA 1"-150LBS, SAFESAMP INLINE SAMPLE VALVE ISV-B / DN25PN16
IMO CIG SERIES HYDRAULIC PUMP 62125LIP
THERMOWELL 316 STEM
VIKING SPUR GEAR PUMP SG-0518-G0U SER. UB51214
AHLSTROM 35FT 3791GPM 1180RPM 12" X 12" CENTRIFUGAL PUMP TP0-30
LINCOLN HIGH PRESSURE PUMP 23880 SERIES SK
GEAR A.1054.7388 08/09 T.I.
INFICON BLANK FLANGE 212-442 NIB
LMI MILTON ROY METERING PUMP C701-297 NNB
GOULDS PUMPS G&L SERIES SSV PUMP W/ 15HP BALDOR MOTOR VM2394T, NO LABEL 100044
BELL & GOSSETT 1800RPM 25HP CENTRIFUGAL PUMP 1531 5E W/ 25HP BALDOR MOTOR
HARTMANN PVX9144/3-CKXXX?-20FL/FG-PCXXXX PUMP 74039-059
ARMSTRONG STEAM TRAP C-144-E
DUMONT ASSORTED BROACHES KEYWAYS
ALTEC PUMP OPERATOR CONTROLLER 670-02776 / 716-50518 B
BRUENINGHAUS HYDRAULIK 1800RPM HYDRAULIC PUMP AA10VS0100 DFLR/31 R-PKC 62 N 00
BELL & GOSSETT 900GPM, 25HP 175PSI SERIES 1510 CENTRIFUGAL PUMP 5E 10.00 BF
REXROTH BRUENINGHAUS 1800RPM 210 BAR HYDRAULIC PUMP AA10VS071DRG / 30R-PKC62K01
HASKEL AIR DRIVEN FLUID PUMP AW-35
NIKKISO HN23B-B3 MEDIUM DUTY NON-SEAL PUMP 77-PR0-P-7701
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