15340667322
热门搜索：
与PLC控制系统连接的各类信号传输线，除了传输有效的各类信息之外，总会有外部干扰信号侵入。此干扰主要有两种途径：一是通过变送器供电电源或共用信号仪表的供电电源串入的电网干扰，这往往被忽视；二是信号线受空间电磁辐射感应的干扰，即信号线上的外部感应干扰，这是很严重的。由信号引入干扰会引起I/O信号工作异常和测量精度大大降低，严重时将引起元器件损伤。对于隔离性能差的系统，还将导致信号间互相干扰，引起共地系统总线回流，造成逻辑数据变化、误动和死机。PLC控制系统因信号引入干扰造成I/O模件损坏数相当严重，由此引起系统故障的情况也很多。
（3）来自接地系统混乱时的干扰
Beckman J-6B Centrifuge Refrigerated -25C 6000 RPM
Amistar/Zebra 100LP PCB Label Printer Applicator 90XiII
MetCraft Power Soak SI-100 4-Sink Ware Washing System
1650' Raychem 0024A0021-9X 100 OHM AWG 24/ 2 Cond Cable
Summit 3-XHD 3XHD Geared Upright Vertical Drill Press
Lot 2 Hobart HR7 Commercial Rotisserie Oven
Conveyor Technologies Reject PCB Vertical Conveyor XRVC
TEL Tokyo Electron Chiller Air-Cooled HFE-7200 9300 BTU
Conveyor Technologies Reject PCB Vertical Conveyor XRVC
Lot 2 Henny Penny SCR-8 3 PH Commercial Rotisserie Oven
Kinetic Vibraplane Vibration Isolation Table 9300 9321
CTI Cryogenics 1020R Helium Compressor Air-Cooled
Conveyor Technologies Reject PCB Vertical Conveyor XRVC
Crown 40WTT-S Walk-Behind 24VDC Stacker ForkLift 3700#
Triad TurboCats II Memory RAM Tester 800MHz DDR2/1 w/PC
Triad TurboCats II Memory RAM Tester 800MHz DDR2 w/ PC
NEW Brooks Automation EFEM FOUP Load Port Cassette +Pod
Cutler Hammer Electrical Control Panel +Breakers LOADED
KLA TEL Wafer Prober Probing Station 80S 200mm X Y Z NR
NEW 4 Hamamatsu Photomultiplier Tube +PCR Light Filters
Conveyor Technologies Reject PCB Vertical Conveyor XRVC
New Jason Hydrotherapy AirMasseur Whirlpool Bath Tub
Brueninghaus Hydraulic Powered High Pressure Water Pump
MicroVision MVT 7080 4-Cassette Wafer Sorter 75-200mm
Rohde & Schwarz SMY02 2GHz Synthesized Signal Generator
Elgar 1751SX AC Power Source with 9012 Programmer+GPIB
Cincinnati Bickford High-Speed Radial Arm Drill Press
New ITT Marlow 3CR18EC Centrifugal Pump + US 3Hp Motor
NEW JAI-Pulnix RMC-4200GE CCD GigE Color Camera 1.2"
Powered Aire TSD-2-120 Door Air Curtain 123"x30"x21"
Toyo Seiki CNC Machine Tool Presetter 40/45/50 Taper NR
Eberbach 8017 Explosion-Proof Laboratory Blender Mixer
ETS Lindgren T/T RF EMI Shielded Chamber/Enclosure
Palamatic Vacuum Hoist Lifting Tube Lifter +Blower Pump
NEW Vickers TK14VP-V45F Hydraulic Power Pack Pump 5HP
Brueninghaus Hydraulic Powered High Pressure Water Pump
NEW Hoffman/McLean CR43-0616 AC Air Conditioner 115VAC
New Primatics PDR110 Direct Drive Rotary Stage 110mm
ESEC 2005 LOC Automatic Epoxy Die Bonder 2005LOC D-711
Hobart UWS Ultima Wrapping System Meat Weigh/Seal/Label
Press-Rite Tonnage 30 Ton Industrial Punch Press
Tampo Print TS 150/200/31 Automatic Tampon Pad Printer
Web Technology Bubble Leak Tester 8000 +1 10" Tank 8410
Branson IPC 4000 Plasma Reactor Asher/Cleaner Chamber
NEW Dreco Vickers LA-5 5HP Hydraulic Power Pack Pump
Powermatic 27 Shaper 5HP 230V w/ Power Feed 28"x 30" NR
AMAT IAC2000-Si Anorad Galaxy X-Y Axis Stage Controller
NEW Hoffman CR43-0616 A/C Unit 115V+A48H36FLP Enclosure
NEW Dreco Vickers LA-5 5HP Hydraulic Power Pack Pump
NEW Galil DMC-4040 Ethernet 4-Axis Motion Controller
Anritsu ML2438A Power Meter 2 Channels w/ Sensor Cable