140CPU65150C
140CPU65150C
140CPU65150C
此外,也有专用于监控PLC工作的软件,它多与PLC的监视终端连用。
有的PLC厂家或第三方厂家还开发了使用PLC的组态软件,用以实现计算机对PLC控制系统监控,以及与PLC交换数据。
PLC的用户也可基于DOS或WINDOWS平台开发用于PLC控制系统的应用软件,以提高PLC系统自动化及智能化水平。这方面的软件已日益受到重视。
总之,为了用好PLC,PLC的支持软件越来越丰富,性能也越来越好,其界面也越来越友好,也因此,它的情况如何,已成为评判PLC性能的指标之一。
5.7可靠控制
为使PLC能可靠工作,在硬件与软件两个方面PLC厂家都采取了很多措施,对一些特殊可靠要求的PLC,还有相应的特殊的措施,如热备、冗余等等。这在介绍PLC的特点时已作了叙述。可靠措施的目的是增加PLC平均故障间隔时间、MTBF(MeanTimeBetweenFailure)及减少PLC的平均修复时间、MTTR(MeanTimeToRepair),以提高PLC的有效度A(Availability)。
现货,现货,降降降,火火火,火火火……
现货,现货,降降降,火火火,火火火……
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USON TRANSDUCER ConVERTER DUAL HI CARD 432A301B
ALLEN BRADLEY / GAURD MASTER 110VAC SERIES A SAFETY REL
ConVUM 1/8" NPT VACUUM FILTERS W/ (2) FITTINGS, VF-3 L
DAYTON 115V 1.54/1.45A 1/40HP BLOWER, 4C006B
DAYTON 6K572B, SPLIT PHASE MOTOR, 1/3 HP, 1725 RPM, FR
NAMCO EE210-60444 10-30 VDC C2 CYLINDICATOR SENSOR, NIB
COOPER 1" SIZE, RIGHT ANGLE PIPE CLAMP B422-1 LOT OF 2
DWYER 3100C PHOTOHELIC PRESSURE SWITCH / GAUGE, 0-100 I
PRECISION TWIST DRILL PTD, 36.00 MM TAPER SHANK TWIST D
ITW VORTEC 701 PANEL GUARD, NIB
PARKER, 32 CBCMPUS14MC 20.00, PNEUMATIC CYLINDER, 32 MM
NUMATICS 152SS400K000030 120 VOLTS 50/60 HERTZ 150 PSIG
BUSSMANN KAA-200 TRON RECTIFIER FUSE, LOT OF 3, NIB
BUSSMANN KAA-200 TRON RECTIFIER FUSE, LOT OF 5, NIB
PEPPERL & FUCHS NJ40+U4+W-Y14423 PROXIMITY SENSOR, NIB
FULFLO 1" NPT HYDRAULIC BYPASS RELIEF VALVE, VJ5RSP NE
NORGREN 300CA-1BA-AA400, ACTUATOR CYLINDER, 300 MM BORE
TURCK RXF 36-0.2M U5406-01 MiniFast 3 PIN FEMALE CABLE,
WILKERSON, F26-04-FM0, FILTER SERIES B, 1/2" NPT, 150 P
NUMATICS 081SS400K000030 SOLENOID VALVE, 150 PSIG-AIR,
NUMATICS 081SS400K000030 SOLENOID VALVE, 150 PSIG-AIR,
PRECISION 1 1/4-12, TAP, NF, HS, GH 4, 6 FLUTE, 5 3/4"
FESTO 1/4" NPT, 175 PSI REGULATOR LRP-1/4-2.5
EDWARDS SIGNALS 340-10N5, VIBRATING BELL, 10" BELL, 120
REXROTH 1/4" THREAD BRonZE SILENCER, 532-401-111-0
MAXON STO-A 0 3/4" ELECTRO-MECHANICAL GAS VENT VALVE
MAXON STO-A 1 3/4" ELECTRO-MECHANICAL GAS VENT VALVE
ASCO SC8210G94, SOLENOID VALVE, 1/2" NPT, 150 PSI, 10.1
ALLEN BRADLEY 800T-X559, LEGEND PLATE, BLANK, LOT OF 40
FESTO 1/4"NPT, 2-PORT, 175PSI, FILTER LFMA-D-MIDI-A, 16