SMP-E20 C8451-A17-A26-7

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SMP-E20 C8451-A17-A26-7
安全接地即将高压设备的外壳与大地连接。一是防止机壳上积累电荷,产生静电放电而危及设备和人身安全,例如电脑机箱的接地,油罐车那根拖在地上的尾巴,都是为了使积聚在一起的电荷释放,防止出现事故;二是当设备的绝缘损坏而使机壳带电时,促使电源的保护动作而切断电源,以便保护工作人员的安全,例如电冰箱、电饭煲的外壳。三是可以屏蔽设备巨大的电场,起到保护作用,例如民用变压器的防护栏。当电力电子设备遇雷击时,不论是直接雷击还是感应雷击,如果缺乏相应的保护,电力电子设备都将受到很大损害甚至报废。为防止雷击,我们一般在高处(例如屋顶、烟囱顶部)设置避雷针与大地相连,以防雷击时危及设备和人员安全。安全接地与防雷接地都是为了给电子电力设备或者人员提供安全的防护措施,用来保护设备及人员的安全。 工作接地是为电路正常工作而提供的一个基准电位。这个基准电位一般设定为零。该基准电位可以设为电路系统中的某一点、某一段或某一块等。当该基准电位不与大地连接时,视为相对的零电位。但这种相对的零电位是不稳定的,它会随着外界电磁场的变化而变化,使系统的参数发生变化,从而导致电路系统工作不稳定。当该基准电位与大地连接时,基准电位视为大地的零电位,而不会随着外界电磁场的变化而变化。但是不合理的工作接地反而会增加电路的干扰。比如接地点不正确引起的干扰,电子设备的共同端没有正确连接而产生的干扰。为了有效控制电路在工作中产生各种干扰,使之能符合电磁兼容原则。我们在设计电路时,根据电路的性质,可以将工作接地分以下为不同的种类,比如直流地、交流地、数字地、模拟地、信号地、功率地、电源地等。不同的接地应当分别设置。不要在一个电路里面将它们混合设在一起,例如数字地和模拟地就不能共一根地线,否则两种电路将产生非常强大的干扰,使电路陷入瘫痪!

产品承诺:
保 证 全新原装进口,
保 证 安全准时发货,
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优势价格,大量现货。

主营DCS系统配件
机器人系统配件
大型伺服系统配件
品牌:ABB   ,AB  ,GE,FOXBORO,本特利,英维思,伍德沃德,西屋,瑞恩,施耐德,西门子,摩托罗拉,安川。力士乐。ACSO,横河等进口品牌。 专业销售进口DCS  PLC系统备件模块
Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA
  专业销售进口DCS  PLC系统备件模块 15天包退换 一年质保 大量现货  国内实力库存商家

Tektronix P3420 Variable Output Pod

Agilent E4887A-102 HDMI Cable Emulator

Table Top RF Test Chamber

HP4947A Transmission Impairment Measuring Set

Tektronix MTS300 MPEG Test System w/op LV-AS

Tektronix DG2020A Data Generator

Tektronix DG2030 Data Generator

Sencore VG91 Universal Video Generator

Wandel And Goltermann ANT-20 Advanced Network Tester

Tektronix TLA 602 Logic Analyzer w/opt 4S

HP/Agilent 8643A Synthesized Signal Generator/opt 001

HP/Agilent 8568B Spectrum Analyzer

Agilent HP8643A Synthesized Signal Generator 1030Mhz

JFW 50BR-008 Benchtop Attenuator

TTC 30609 Framing Interface Adapter

HP/Agilent 3708A Noise and Interference Test set

Ranger Intelliscan 18-Zone Walk through Metal Detector

Agilent-HP 4275A Multi-Frequency LCR Meter opt-001,004

PTS Frequency Synthesizer 0.1-160MHz

Programmed Test Sources Frequency Synthesizer 1-500 MHz

Boonton 56218-S1 Dual Diode Power Sensor

Agilent HP8760A KE4 Dynamic Range Extender

HP 3708A Noise & Interference Test Set

Panasonic VP-8193A Signal Generator

Kikusui Electronics Corp. PLZ300W Electronic Load

Giga-tronics 80401A Power Sensor 0.01-18 GHz

Hewlett Packard 87104A SP4T Coaxial Switch

Agilent/Hewlett Packard 87104B SP4T Coaxiial Switch

VWR Scientific 1350F Oven

HP 54120A Digitizing O’scope and HP 54121A 4 Channel

Tektronix AM503 Current Probe Amp & A6303 Current Probe

Linear Positioner LS-612/06031 30mm Travel

Chuo Seiki LS-612 06031 Linear Positioner 30mm travel

Chuo Seiki Linear Positioner LS-912 06033 60mm

LS-912 06033 Linear Positioner/Prec​ision Slide

Chuo Seiki LS-912 06033 Linear Positioner 60MM travel

Hewlett Packard 778D Dual Directional Coupler

Amprobe AM-16 Multimeter

Agilent E4432B ESG-D Signal Generator 250kHz-3.0GHz

Anritsu SC6287 Demo Kit

VWR Scientific 1147 Refrigerated Bath Circulator

HP 2225A Injet Printer with HPIB Port

HP 1661C Logic Analyzer

Giga-tronics 80401A Power Sensor

Agilent/Hewlett Packard 8754A Network Analyzer

Bruel Type 2706 Power Amplifier

Hewlett Packard 8656B Signal Generator

Tektronix 7904A Oscilloscope

Agilent 6651A 400W DC Power Supply 0-8V 0-50A

HP 16047A Test Fixture

US G2 MainFrame w/6each G2R14 1×6 RF Relays

Tektronix P6022 Termination + AC Current Probe

Noise/Com MP2700-6 Multipath Fading Emulator

DowKey 5010 Cellular Receiver Test System

Agilent/HP E8285A CDMA Mobile Station Test Set

Agilent/Hewlett Packard 8904A Multifunction Synthesizer

Agilent/Hewlett Packard 54620A Logic Analyzer

Satimo SAT 2001 Probe Array Controller

Satimo SAT 2021 Active Measurement Test Unit

Satimo SAT 2013 RF Unit

Agilent/Hewlett Packard 778D Dual Directional Coupler

Meca 722N-20-3.100 Dual Directional Coupler

HP 8495A Programmable Attenuator /70dB

EXFO FIP-S15 Handheld Display w/P5 Inspection Probe

Tektronix 11403 Digitizing Oscilloscope

Magna Flux ZB-100 Black light

Federal Products Corp EAS-2350 N/A

Met One 200-1-115-2 Clean Room Monitor

Spectroline PR-125T UltraViolet Eprom Eraser

Xantrex Model XTS 120-0.5 M2 Power Supply

Kepco BOP 20-5M Bipolar OpAmp Supply

Xantrex XTS 120-0.5 GPIB M3 Power Supply

Xantrex XTS 60-1 GPIB Power Supply

Glassman Europe XM20-3MAA Programmable DC Power Supply

Sorensen XTS 7-6 M9B M13 Programmable DC Power Supply

SRT FPD-W Plus BGA Re-Work Station

Air-Vac DRS-22 Hot Air Re-work station

Tektronix P6015A 75Mhz High-Voltage Probe

Agilent/Hewlett Packard 8753B 6Ghz Network Analyzer

Radyne Comstream DM240 Digital Modulator

Tektronix TLA 704 Logic Analyzer

PMC 720 Series 10″ Dataplate Digital Hot Plate/Stirrer

Olympus NEO Splan 100 Objective

Olympus NEO SPlan 20 Objective

Olympus NEO SPlan 50 Objective

Mitutoyo QV 2.5x Objective

Mitutoyo QV 5x Objective

Trilithick BMA-580 Attenuator

Agilent 8761B SPDT RF Switch w/opt 000

Agilent/Hewlett Packard 8761B SPDT RF Switch

LeCroy CATC 5K Protocal Analyzer w/UWB Analyzer

Greenlee 299 9-Pin D-Subminiature Panel Punch

Greenlee RS232 25-Pin D-Subminiature Panel Punch

Greenlee 234 37-Pin D-Subminiature Panel Punch

Rohde and Schwarz FSP 3 Spectrum Analyzer

FOI-150 Fiber Optic Light Source w/ring light

HP 8762A Coaxial Switch

Agilent/HP 8762B Coaxial Switch

WSI 19 inch Single Bay Mobile Test Rack

Continental – Superterm 8 Intelligent Controller

Agilent Triple Output DC Power Supply E3631A

Agilent E3631A Triple Out put DC Power Supply

Kepco BOP 20-5M Power Supply/Amplifie​r

HP 8494G Programmable Attenuator 11dB

HP 8496G 110 dB Attenuator

Bransononic 3510 Table Top Ultrasonic Cleaner

Agilent 8763B Coaxial Switch

Standard SCM550HP NTSC TV Modulator

Tektronix P6137 Passive Voltage Probe for 2400 Series

Blonder Tongue oc16 Passive Combiner

HP 11636A Power Divider, DC to 18 GHz

Miyachi Unitek TCW/1-196-03 Thermocouple Welder-TCW

Miyachi Unitek DC25 Welding Control w/No. 80 Weld Head

Narda 3020A Bi-Directional Coaxial Coupler

Narda 4226-20 Directional Coupler

Narda 4226-10 Directional Coupler

ROD-L M25 Ground Continuity Tester

Ophir 4003F RF Power Amplifier

Agilent/Hewlett Packard 87130A Attenuator/Swit​ch Driver

M/A-Com MPD EWAL 4010-12 Solid State Amplifier 80W

Stereo Zoom 4 Microscope B&L

Stereo Zoom 4 Microscope 0.7x-3.0x Bausch&Lomb

Bausch & Lomb Stereo Zoom 4 Microscope

Bausch and Lomb Stereo Zoom 4 Microscope

Agilent 33120A 15MHz Waveform Generator

Agilent/Hewlett Packard 34401A 6 1/2 Digit Multimeter

Quadchek II 7564SA Electrical Safety Analyzer

California Instruments 5001 i 5KvA AC Power Source

Hewlett Packard 3588A Spectrum Analyzer

100 Watt Attenuator SA3N100-30F 30db 3Ghz

SA3N100-30F 100 Watt Attenuator

S.M. Electronics SA3N100-30F 100 Watt Attenuator

Agilent VXI Mainframe E8403A w/6 modules

Agilent/Hewlett Packard 773D Directional Coupler

Agilent 89611 VSA / E8403A VXI Mainframe

Agilent N5102A Digital Signal Interface Module

Sigma II Sigma Memory Tester w/ memory adapter

Sigma II Sigma Memory Tester w/Sparc 5/10 adapter

DSI Sigma II Sigma Memory Tester

PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家


选择深圳长欣,选择放心,售后无忧大量现货,当天顺丰发货!
主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。