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USB-6211,

USB-6211

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一般工业控制系统既包括弱电控制部分，又包括强电控制部分。为了使两者之间既保持控制信号，又要隔绝电气方面的，即实行弱电和强电隔离，是保证系统工作稳定，设备与操作人员安全的重要措施。

　　电气隔离目的之一是从电路上把干扰源和易干扰的部分隔离开来，从而达到隔离现场干扰的目的。

　　一、信号隔离

　　信号的隔离目的之一是把引进的干扰通道切断，使测控装置与现场仅保持信号，不直接发生电的。工控装置与现场信号之间常用的隔离方式有光电隔离、脉冲变压器隔离、继电器隔离和布线隔离等。

　　1.光电隔离

　　光电隔离是由光电耦合器件来完成的。其输入端配置发光源，输出端配置受光器，因而输入和输出在电气上是完全隔离的。由于光电耦合器的输入阻抗(100Ω～1kΩ)与一般干扰源的阻抗(105～106Ω)相比较小，因此分压在光电耦合器的输入端的干扰电压较小，它所能提供的电流并不大，不易使半导体二极管发光。另外光电耦合器的隔离电阻很大(约1012Ω)、隔离电容很小(约几个pF)，所以能阻止电路性耦合产生的电磁干扰，被控设备的各种干扰很难反馈到输入系统。

　　光电耦合器把输入信号与内部电路隔离开来，或者是把内部输出信号与外部电路隔离开来，如图1所示。开关量输入电路接入光电耦合器后，由于光电耦合器的隔离作用，使夹杂在输入开关量中的各种干扰脉冲都被挡在输入回路的一侧。由于光电耦合器不是将输入侧和输出侧的电信号进行直接耦合，而是以光为媒介进行耦合，具有较高的电气隔离和抗干扰能力。

　　目前，大多数光电耦合器件的隔离电压都在2.5kV以上，有些器件达到了8kV，既有高压大电流大功率光电耦合器件，又有高速高频光电耦合器件(频率高达10MHz)。常用的器件如4N25，其隔离电压为5.3kV；6N137，其隔离电压为3kV，频率在10MHz以上。

　　2.脉冲变压器隔离

　　脉冲变压器的匝数较少，而且一次绕组和二次绕组分别绕于铁氧体磁芯的两侧，这种工艺使得它的分布电容特小，仅为几个pF，所以可作为脉冲信号的隔离元件。脉冲变压器传递输入、输出脉冲信号时，不传递直流分量，PLC使用的数字量信号输入/输出的控制设备不要求传递直流分量，因而在工控系统中得到了广泛的应用。

　　图2是脉冲变压器的应用实例。电路的外部信号经RC滤波电路和双向稳压管抑制常模噪声干扰，然后输入脉冲

　　变压器的一次侧。为了防止过高的对称信号击穿电路元件，脉冲变压器的二次侧输出电压被稳压管限幅后进入测控系统内部。一般地说，脉冲变压器的信号传递频率在1kHz～1MHz之间，新型的高频脉冲变压器的传递频率可达到10MHz。

　　3.继电器隔离

　　继电器的线圈和触点没有电气上的，因此，可利用继电器的线圈接受信号，利用触点发送和输出控制信号，从而避免强电和弱电信号之间的直接接触，实现了抗干扰隔离。

　　图3是继电器输出隔离的实例示意图。在该电路中，通过继电器把低压直流与高压交流隔离开来，使高压交流侧的干扰无法进入低压直流侧。

　　4.布线隔离

　　将微弱信号电路与易产生噪声污染的电路分开布线，zui基本的要求是信号线路必须和强电控制线路、电源线路分开走线，而且相互间要保持一定的距离。配线时应区别分开交流线、直流稳压电源线、数字信号线、模拟信号线、感性负载驱动线等。配线间隔越大，配线越短，则噪声影响越小。但是，实际设备的内外空间是有限的，配线间隔不可能太大，只要能维持zui低限度的间隔距离便可。

　　附表列出了信号线和动力线之间应保持的zui小间距。如果受环境条件的限制，信号线不能与高压线和动力线等离得足够远时，就得采用诸如信号线路接电容器等各种抑制电磁感应噪声的措施。

 

194R-LNC7 Terminal Shroud, 3P, 125A

2090-CFBM6DD-CCAA07 TL-Series 7m Feedback Cable

2090-XXLF-TC350 Kinetix Drives Line Filter

2097-V33PR5 Kinetix 300 Servo Drive

CBL-38-MP-20 Power cable for MTR-3S80 series servo motors. 20 feet

GC646PCM050 GlobalCare Complete for Change Management 50 user pack

IC200ACC301 I/O filler module

IC646PPT100 4-day OpenProcess Training per Student

IC647HSTES250KM Historian Enterprise Server 250000 Points (M4 Key)

IC650AEL003RR Series Six Controller Board with Faceplate (MAP30) **

IC694APU300 High speed counter module 200KHZ A B and C type.

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MicroLogix 1200 System 1762-RPLTLBL2 REPLACEMENT LABELS FOR 1762 I/O MODULES

PLC-5/1771 System 1771-WE THERMOCOUPLE WIRING ARM FOR IX/IY

Distributed I/O 1794-IRT8 NON-ISOLATED, THERMOCOUPLE/RTD/MV INPUT MODULE

Communications 9399-WAB32LUGPT RSLINX LITE USER GUIDE (PORTUGUESE)

Support 6223-5VDMS 6223-5VDM 6200 SERIES VAX SW SUPPORT RENEWAL

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IC200MDL632 INPUT 125VDC POS/NEG LOGIC ISO 16PT

IC697CPX928RR CPU, 96MHz, 12K discrete I/O, 6M byte fixed user memory

MTR-1324-E-D-E-SRR Stepping Motor Nema34 3A Encoder Splashproof

FP3HCPU

FSC-7162VE

DONJIN-D081AR D081A-PCI

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150-F625JBE Encl. SMC Flex Smart Motor Controller

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1783-BMS12T4E2CGP Stratix 5700 18 port managed switch

193-EMC E1 Plus Adjustment Cover

20-750-DENC-1 PowerFlex 750 Dual Encoder Option module

2090-CPWM7DF-12AA02 MP-Series 2m Power Cable

2098-DSD-010-SE Ultra 3000 1kW with SERCOS Servo Drive

G-0017 Foot Switch Splitter (for 4-port NT only)

GFK-2098 IC697VRD008, RTD/Strain Bridge Module

IC220PWR013 SEGMENT TERMINAL, FUSED 24VDC W/DIAG (REQUIRES 1 IC220TBK087)

IC647DNP010 "DNP3 Master Protocol for 10,000 points"

IC647S2GC S2G:SECS-II

IC693MDL632LT 125 Vdc Input (8 Points) (LT)

IC756DVE000E-99 EO GECK (Graphical Editor Construction Kit) - Unix, English, Version 9 .9

MSI-QUAL-10-43 Quality Mang Clients 10 Pack-43

PLC-5/1771 System 1771-ASB PLC-2,-3,-5, REMOTE I/O ADAPTER MODULE

Distributed I/O 1790D-0B16 DNET LDX I/O, 24VDC, 16 SOURCE OUT BASE, D-SHELL

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IC693ACC318 Connector Kit, 24 Pin, Qty (10), Ribbon Type (For MDL654, 655, 752, 753)

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190S-AND2-CB63C 4.0-6.3 A Compact Comb Starter W/Ckt-Bkr

194R-N60-1753-PBS1 Non-Fused 194R Disconnect Switch

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GF-3093R Connecting FlashCable to Sensotec Pressure Transducer, Keyence LS-5000 .

IC200UDR002 14 point PLC,(8) 24VDC In, (6) Relay Out, 24VDC Power Supply

IC646TPR935 ProServer 35,000 I/O Point Runtime System

IC647PATAXS0 Proficy PAT - Driver For All Axsun Technologies Near-Ir Spectrometers

IC693APU300 High Speed Counter (HSC)

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GFN-0005 90-30 Distributor Seminar Student's Manual

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MTR-1324-E-D-E-S Stepping Motor Nema34, Series Wdg, Encoder, Splashproof

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1761-CBL-AS03 MicroLogix Cable

188-K3B200 Miniature Circuit Breaker 20 A

194L-E16-2503 16 A 194L Load Switch

2090-CPBM4DF-16AF20 MP-Series 20m Length Cable

2090-XXNFMF-S20 Kinetix Drives 20m Standard Cable

BC647OEM0500 OEM Edge Program - Complete (Approval Required)

GC647PATBRS0 Proficy PAT - Driver For Brimrose Near-Ir Spectrometers - Assist Support

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IC646NRX000 System Sentry

IC647MBL001 Machine Edition Lite Development Suite with USB Hardware key

IC675GSD001 Profibus Station IP67 GSD Configuration Files

IC697MDL740 24/48 Vdc Output, 2 Amp, Positive Logic (16 Points)

IC800SLR003 External regeneration resistor rated 20 ohm 300 Watt for SL and S2K series

ControlLogix/1756 System 1756-BATM CONTROLLOGIX BATTERY MODULE

Industrial Computers 6182H-15BRH15D VVCE 1500, KEY/TOUCH, STD MEM, CNET, DC

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Support 9326-AD10WDR SUPT REINSTATEMENT CONTRACT FOR 9326AD10WDENE

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Motion Control 2090-UXNFM-S03 CABLE,ULTRA, DRIVE CN2 TO N/C,3M

CBL-1C-ET-20 Encoder Cable, MTR-1216, 1221 & 1231 Stepping Motors, 20 Ft.

IC630MDL303RR 5-12Vdc (TTL) Sink Input Module, D Connector (32 points)

IC800SLCFLYV010 Flying Lead Cable, 1-5 kW SL Amplifier I/O to OCS or 3rd Party Controller, 1 Meter

OC647IFSETKTC iFIX Optn: System Extension Toolkit (M1Component Part)

PXI-2569

ROBO-8712VLA

PHILIPS HEALTHCARE SNGBP 459800079641

N2200-PAC-400W

NUPRO-A301 NuPRO-852

4036A H9MSER40XX

1492-MCBA180 80 A UL489 Miniature Circuit Breaker

1494V-DJ622-A-B-D NEMA Flange Mtd Rod Switch Disconnect Sw

软启动器 3RW44566BC35

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1585D-M4UBJM-4 Ethernet Media M12, Patchcord

1756-L72 ControlLogix 4 MB Controller

1799-BRKD Embedded Input/Output DIN Rail Bracket

194E-FA16-P11-PE 194E Load switch

2090-CFBM6DF-CBAA15 TL-Series 15m Feedback Cable

2090-SCNP32-0 Kinetix 32-32m Fiber Optic Cable

BC646MPM001 Logic Developer PLC Nano/Micro with Proficy GlobalCare Complete

GC647AHC001 GC PA Historian Connector

HMI-CAB-ETH 6 feet, Ethernet Cross-over cable for direct connection to CE devices

IC641VPD010 VersaPro Distributor Demo 10 Pack

IC647IFGLBLDPNSRVRM-55 iFIX WebSpace v5.5 Dependent Server

IC660EBD120RR High Speed Counter Electronic Assembly

IC697ACC644 24VDC fan tray for Series 90-70 or RX7i short racks.

IC756WRE499E-27 Runtime License Windows 100+ Users English v2.7

FlexLogix System 1794-IE8 ANALOG INPUT MODULE, 12 BIT, 8 POINT

PLC-5/1771 System D6200-6.4.11RU PLC5 PROG. SW INSTRUCTION REFERENCE MNL (RUSSIAN)

Process Control 1757-PLXSU300 PLX SERVER 100 TO 300 POINT EXPANSION

Operator Interface 2711P-T10C4D1 PV PLUS 1000, TOUCH, ENET, DC PS, STD MEM

Support 6001-A1CS SUPT RENEWAL CONTRACT FOR 6001A1C

Support 2711-END1FRR SUPT REINSTATEMENT CONTRACT FOR 2711END1FR

Support F1785-L46BSERD FIRMWARE UPGRADE FOR 1785-L46B PLC5 PROCESSOR MODU

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IC300OCS056 8 DC Inputs (12/24vdc), 6 Relay Outputs (3.0A ea), 4 Analog Inputs (0-20mA, 0-5v, thermister), 2 Analog Outputs (0-20mA, 0-10v)

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MTR-3T21-G-R-0-M-S-MODRR Servo Motor Metric Mod=0.375 Sft Ext

PCI-6224

SM-GM45(2858)

X1034A 501-5406

IOI FWBX2-PCIE1XE220

HICORE-I6420VLG

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1493-N3 Kit,Overload Relay Reset For Starter

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附件 6ES7 954-8LE02-0AA0 存储卡：12 MB

1585-C8VB-S300 Cable Spool Ethernet Media

1746-RT27 SLC Replacement Terminal Block

1790D-N4C0 CompactBlock LDX Input Block

194E-A25-3753 25 A 194E Load switch

20-PP11009 WIRE (INVERTER)

2090-CSBM1DF-18AF10 Kinetix Cable Single DSL 2090-Series

20AC043C3AYNAEC1 PowerFlex 70 AC Drive 43 A at 22 kW 20A

GC646MBLS99 Proficy GlobalCare Complete for ME Lite Development Suite - Site License

HE670ADC840 Discontinued Part. Check with GE IP on migration path.

IC600LX648RR 32K Logic/16K Register Memory Module

IC647HSTESEO1000KM eSignature Option for Historian - Enterprise Server 1,000,000 Points (M4 Key)

IC655BEM510RR Genius Bus Controller with Diagnostics - Ph B

IC694DSM324 DSM324 motion controller module for the RX3i

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