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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。

 

IC660BBD023RR 24Vdc Sink I/O Block, 16 Circuit, Ph B

IC693MDL390CA Conbal Coated OUTPUT module 120/240 VAC 2A 5 point, isolated per point.

IC697ACC715 Kit, VME Integrator, J2 Backplane Mounting

IC756WDJ009E-26 DV Dev Sys VB and Java, Eng v2.6

MSI-IGC 7 Day x 24 Hour Support / GlobalCare

PLC-5/1771 System 9399-PLC5UM PLC 5, 6200 SERIES CONFIG. + MAINT. USER MANUAL

Distributed I/O 1791R-RIOSCON RIO 6 PSITION CONNECTOR, LOCK SCREWS (LOT OF 5)

Process Control 1757-PFBEXP080 PROFIBUS INTERFACE MODULE EXPANSION

Operator Interface 2711P-RR128 PVP/VVCE RAM SO-DIMM 128MB

Support 9357-ANETMDAD3S SUPT RENEWAL CONTRACT FOR 9357ANETMDAD3E

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ControlNet Products 1734-OB8E 24V DC8 CHANNEL SOURCE OUTPUT MODULE

RSI Software Products 9301-2SE2400U5R UPGRADE: OUT-SUPT: RSVIEW32 WORKS 5000 TO 32000

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Motion Control MPL-A420P-MJ24AA MOTOR,SERVO,4.74 NM,5000RPM,MULTI,230V,BRK,6.8KG

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CBL-13-ET-30 MTR-1300 and MTR-1N Series Stepping Motor Encoder Feedback Cable, 30 Ft.

IC600YR550RR 13" I/O Rack with High Capacity P/S, 115-230Vac (8 Slots)

IC800SKCPZ100 Power Cable, S2K to 200 - 750W S-Series Servo Motors, 10 Meters

OC647IFGLBLCLN001M-50 iFIX WebSpace: Additional 1User v5.0

PXI-2529

SeaTech ST104 DX430 PC104 DX10440-E

PCA-6194

SSH-250G

PX-14S1

ACC24P2 603135-104

1492-MCAA115 15 A UL489 Miniature Circuit Breaker

1494U-FC302J 1494U 30A Class H/J 250V Fuse Clip

软启动器 3RW44542BC45

SIMATIC STEP 7 V14 6ES7810-5CC00-0YM2 SIMATIC STEP 7 专业版 SUS Compact Combo (TIA Portal & Classic)

1585D-M4UBDM-0M6 Micro D-Code, QD Style Ethernet Media

1756-IF8K ControlLogix 8 Point Analog Input

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194E-E32-1753 32 A 194E Load switch

2090-CFBM4DF-CDAF90 MP-Series 90m Feedback Cable

2090-MCNPMP-6S12 MP-Series 12 m Length Power Cable

BC646MBLS99 Machine Edition Lite Development Suite Unlimited Seat Site License with Proficy GlobalCare Complete

GC646VPN999 Proficy GlobalCare Complete for VersaPro Nano/Micro Edition - Site License

HMI-CAB-C104 CABLE SIEMENS 3964R TTY

IC641HBR300 Max-ON Lite Software for 90-30 Hot Stand By Redundancy

IC647IFCLNTCRNM iFIX iClient Runtime (M4 Part)

IC660EBA025RR Current Source Analog Output, 24/48Vdc Power, Elec Asm only

IC695NKT001 RX3i Ethernet NIU Kit includes NIU (IC695NIU001) and Ethernet module (IC695ETM001). ENIU supports two serial ports and 20k of local logic. TheENIU must be installed in a IC695CHSxxx base.

IC756WRE049E-26 DV Runtime Win 25-49 Per User Eng v2.6

FlexLogix System 1794-IB10XOB6 10/6 24VDC COMBO

PLC-5/1771 System D1771-6.5.95 CONTROL COPROCESSOR USER MANUAL

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IC752PWS000 Mature. Datapanel 320T Power Supply

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PCI-5406

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1492-WM4-BL IEC Term Blck 8x47.6x41mm Screw

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紧凑型信号模块 6ES7 521-1BH10-0AA0 DI 16：数字量输入模块，DI 16x 24VDC BA, 25mm 模块，含前连接器

1585-C4EB-S600 Ethernet Cable Spool PVC Red 600m

1746-OA16 SLC 16 Point Output Module

1788-EN2FFR 1788 Red ENet/IP to FF Linking Device

193S-EETD E1 Plus 9-45 Amp IEC Overload Relay

20-PP01065 POWER CABLE CONN S, FRAME 9

2090-CSBM1DF-14AF30 Kinetix Cable Single DSL 2090-Series

20AC030A0NYNANC0 PowerFlex 70 AC Drive 30 A at 15 kW 20A

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IC647HSTCSEO50KM eSignature Option for Historian - Enterprise Corporate Server 50000 Points (M4 Key)

IC647WFLWTR Proficy Workflow - Water Operations Templates

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IC756RRT000 DataViews Runtime for Unix

MicroLogix 1200 System 1762-OW8 8 POINT VAC/VDC RELAY OUTPUT MODULE

PLC-5/1771 System 1771-QB LINEAR HYDRAULIC POSITIONING MODULE

Distributed I/O 1794-OB8 24 VDC OUTPUT 8 POINTS

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RSI Software Products 9324-RL53U7ENR RSLOGIX 5 STD TO PRO UPGRADE, EXP SUP >90D

RSI Software Products 9301-2SE350FRU2R RSVIEW32 RUNTIME 1500-100K UPGRADE OUT-SUPT (FR)

RSI Software Products 9358-HSTS2400U1R UPGRADE: OUT-SUPT: HISTORIAN 150 TO 32K TAG

Motion Control 8720SM-007S1CAS3 SPARE PART ONLY - GMS ITEM

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IC697ACC900 Fiber Optic Cable for Reflective Memory module (IC697VRM015). Five feet long

MTR-1235-0-D-E-0RR Stepping Motor Nema23 Double Shaft

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PCM-3362

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Deckb Intensity Pro 4k

IPC-619MB/PCA-6010VG

TS-M751-11310

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1492-SPM3B030 MCB Supplementary Protector 3 A

软启动器 3RW40241BB04

电机启动器 3VU16402CP00

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193-EF2BZJ Solid State 160-400 A Overload Relay

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2090-CPWM7DF-10AF02 MP-Series 2 m Length Power Cable

2097-V33PR6-LM Kinetix 350 3.0kW Servo Drive

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GFK-2058 VMIC - Analog Output User's Manual - IC697VAL301

IC220MDL721 OUTPUT, 24VDC POSITIVE LOGIC 2.0A, 2PT (REQUIRES 1 IC220TBK082)

IC647DMC020 DataMart 20 Reporting Clients

IC647RAMM RAM:Reliance Electric Auto-Max

IC693MDL310RR 120 Vac Output, 05 Amp (12 Points)

IC756CDV001K-97 DV Development - Compaq True64 Op Sys Addt'l User, Korean, Version 9.7

MSI-PROD-2 Product Management Clients 2 Pack

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Distributed I/O 1790-0V16X LDX I/O, 24 VDC, 16 SINK OUT EXPANSION, D-SHELL

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Support 9324-RLD300DES SUPT RENEWAL CONTRACT FOR 9324RLD300DE

DeviceNet Products 2711-K10G10 PV1000 GRAYSCALE KEY, DNET & RS232 PRINT

RSI Software Products 9301-2SE3400DEU5 RSVIEW32 RUNTIME 5K-32K UPGRADE IN-SUPT (DE)

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HE693THM665 6 channel thermocouple b module for Series 90-30 with 0.1癈 resolution, bus/channel isolation and 50Hz filtering.

IC670MDL930 Relay 2A 8 Pt. 6 Form A/2 Form C Isolated

QPJ-DVN-202 MODULE DEVICE NET SLAVE

STXPBS132 STXi Profibus with 24VDC source (Negative Logic) b, 32 points, expandable to 8 additional modules.

SCC-68

DAC-7112DG

W26361-W11-X-02

宇泰UTEK UT-758

HSC-1812CLD2NA

CORONA2 7030-0103

1492-SPM1B130-N MCB Supplementary Protector 13 A

直流电源 6EP1331-2BA00 120/230VAC 输入，24VDC/2A 输出

6ES72411CH301XB0

1497D-A13-M10-0-N 2000VA 240x480-120x240V 60Hz GPT

1606-XLSCAP24-12 XLS Buffer Module

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190E-ANEJ2-CB25X 1.6-2.5 A Economy Starter W/Ckt-Bkr

194R-J60-1753S-PYS1 194R Disconnect Switch

2090-CPBM7DF-14AF25 MP-Series 25m Continuous-Flex Cable

2090-XXNPT-16S25 TL-Series 25 m Length Power Cable

CBL-3T-RD-20 Resolver cable for MTR-3T series servo motors. 20 feet

GF-0913R Connecting FlashCable to Daytronic, Edmunds Accu-Setter, Toledo Microt rol.

IC200UAR028 28 point PLC,(16) 120VAC In, (12) Relay Out (2 at 10 amp and 10 at 2 a mp) 120V/240AC Power Supply. Battery (IC200ACC403) is required for dat a retention. Battery not included.

IC646TDV935 35,000 I/O Point Development System

IC647NXV001 Proficy Tracker Order Execution Management Web Viewer

IC693ALG223RR Analog Input, Current, 16 Single Channels

IC752DEM000RR Datapanel Demo Kit A

IC800VMM20MNKSE25 2 kW VersaMotion medium inertia servo motor (9.55 Nm)

SLC/1746 System 8100-HS110 ODS SOFTWARE FOR IMC110

Industrial Computers 6189V-SLCOMBO CD DRIVE WRITEABLE DVDROM (SLIM).

Application-specific products 1404-CAL CALIBRATION SERVICE FOR THE POWERMONITOR 3000

Operator Interface 2711-K6C8 PV600 COLOR KEY, DH+ & RS232 PRINT

Support 9301-2SE2500S SUPT RENEWAL CONTRACT FOR 93012SE2500

Support 9380-RSBAR10000R SUPT REINSTATEMENT CONTRACT FOR 9380RSBAR10000

DeviceNet Products 1734-VHSC24 24 VDC VERY HIGH SPEED COUNTER WITH SOURCE OUTPUTS

RSI Software Products 9301-2SE3200ESU1 RSVIEW32 RUNTIME 150-300 UPGRADE IN-SUPT (ES)

RSI Software Products 9358-BPC60U2R UPGRADE: OUT-SUPT: RSBIZWARE PC PHASES 10 TO 60

Motion Control MPL-B430P-RK24AA MOTOR,SERVO,6.55 NM,5000RPM,RSLVR,460V,BRK

Motion Control 2090-SCEP8-0 SERCOS FBR CABL,CONN,ENCLOSURE ONLY PLASTIC,8.0M

GFK-1192 Series 90-70 System Manual

IC646MDD150 Logic Developer PC (HRT)150 Tag Runtime & Development System

MSP-TCJ-IN1 Obsolete - Type J (0 to 760C) in / Pulse out

QPI-DVN-202 Communication Module for 7 inch/ 9 inch/ 10 inch & 12 inch: DeviceNet Slave

PXIe-4302

PCI-1751

PPT Vision 411-0144

W26361-W108-Z2-02-36

10001x100

ACS-1014

1492-PD3113 310 A Power Distribution Block

中央机架 6ES7403-1JA01-0AA0 ER2 机架，9 槽，只能插信号模板

变送器 3RS17051FW00

TIA 博途数字化选件 6ES7823-0BA00-1BA0 SIMATIC OPC UA S7-1500 small ( ET 200SP to CPU-1513(F) )

1585J-M8PBJM-6 RJ45 Ethernet Media

1760-MM3 PicoGFX Memory Module

188-K2D250 Miniature Circuit Breaker 25 A

194L-E12-3503 12A 194L Load Switch

2090-CPBM4DF-10AF15 MP-Series 15 m Length Cable

2090-XXLF-TC365 Kinetix Drives Line Filter

BC647OEM0201 OEM Edge Program Renewal - CIMPLICITY

GC647IPWRTS3CLNSCSPTM iPower Option - 3 TS Client Support on SCADA Server Globalcare Complete part

IC200ETM001 EXPANSION TRANSMITTER, includes IC200ACC201 termination plug.

IC646NGU000 Gage Port Mitutoyo Communications

IC647ITMC ITM:Intermec Barcode Readers

IC670MDL644RR 24VDC Pos/Neg Logic Fast Input 16 pt. Grouped

IC697MDL350RR 120 Vac Output, 05 Amp (32 Points)

IC800SLCPV050 Power cable for SDM100 or SLM100 or SDM250 or SLM250 or SGM450 S-series servo motor. 5 meters

ControlLogix/1756 System 1756-PA75 85-265V AC POWER SUPPLY (5V @ 13 AMP)

Industrial Computers 6182H-12TEH6B VVCE 1250, TOUCH, EXT MEM, RIO/DH, AC

Process Control 1757-PFBUPG002 PROFIBUS LIC UPG 2 IOMS

Operator Interface 2711P-RW2 PV PLUS INTERNAL CF W/ OS & ME, 128 MB

Support 9357-DNETMDU3S SUPT RENEWAL CONTRACT FOR 9357DNETMDU3E

Support 9363-PORTALR SUPT REINSTATEMENT CONTRACT FOR 9363PORTAL

ControlNet Products 1734-IK 24 VDC INCREMENTAL ENCODER MODULE

RSI Software Products 9301-2SE2403ZHE RSVIEW32 WORKS 32K WITH RSLINX (CHINESE)

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CBL-14-ED-20 Encoder Cable, MTR-1235, 13xx, 14xx & 1N Series Splashproof Stepping Motors to IMC-D or S2K, 20 Ft.

IC610MDL126RR 115Vac Isolated Input (4 points)

IC800SLA2502 2500W, 230VAC SL Series Amplifier

OC647IFGLBLCLN020M-55 iFIX WebSpace Client v5.5 - Additional 20 Users

PXI-2546

MB945

PCIE-9450-R30

ATP-24A

SBC-9830

03-20932-03

1492-MCAA230 30 A UL489 Miniature Circuit Breaker

1494U-LC36 1494U 30A-60A Copper Lugs

软启动器 3RW44552BC46

Safety Advanced V14 6ES7833-1FA14-0YY5 Upgr. DS V5.4->Safety Adv. V14 SP1 SW DL

1585D-M4UBDM-50 Ethernet Media M12 Patchord

1756-IT6I2 ControlLogix 6 Pt Enhanced TC In Module

1797-PS1E FlexEx Power Supply

194E-E63-1753 63 A 194E Load switch

2090-CFBM6DD-CCAA05 TL-Series 5m Feedback Cable