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一般工業控制系統既包括弱電控制部分，又包括強電控制部分。為了使兩者之間既保持控制信號，又要隔絕電氣方面的，即實行弱電和強電隔離，是保證系統工作穩定，設備與操作人員安全的重要措施。

　　電氣隔離目的之一是從電路上把干擾源和易干擾的部分隔離開來，從而達到隔離現場干擾的目的。

　　一、信號隔離

　　信號的隔離目的之一是把引進的干擾通道切斷，使測控裝置與現場僅保持信號，不直接發生電的。工控裝置與現場信號之間常用的隔離方式有光電隔離、脈沖變壓器隔離、繼電器隔離和布線隔離等。

　　1.光電隔離

　　光電隔離是由光電耦合器件來完成的。其輸入端配置發光源，輸出端配置受光器，因而輸入和輸出在電氣上是完全隔離的。由于光電耦合器的輸入阻抗(100Ω～1kΩ)與一般干擾源的阻抗(105～106Ω)相比較小，因此分壓在光電耦合器的輸入端的干擾電壓較小，它所能提供的電流并不大，不易使半導體二極管發光。另外光電耦合器的隔離電阻很大(約1012Ω)、隔離電容很小(約幾個pF)，所以能阻止電路性耦合產生的電磁干擾，被控設備的各種干擾很難反饋到輸入系統。

　　光電耦合器把輸入信號與內部電路隔離開來，或者是把內部輸出信號與外部電路隔離開來，如圖1所示。開關量輸入電路接入光電耦合器后，由于光電耦合器的隔離作用，使夾雜在輸入開關量中的各種干擾脈沖都被擋在輸入回路的一側。由于光電耦合器不是將輸入側和輸出側的電信號進行直接耦合，而是以光為媒介進行耦合，具有較高的電氣隔離和抗干擾能力。

　　目前，大多數光電耦合器件的隔離電壓都在2.5kV以上，有些器件達到了8kV，既有高壓大電流大功率光電耦合器件，又有高速高頻光電耦合器件(頻率高達10MHz)。常用的器件如4N25，其隔離電壓為5.3kV；6N137，其隔離電壓為3kV，頻率在10MHz以上。

　　2.脈沖變壓器隔離

　　脈沖變壓器的匝數較少，而且一次繞組和二次繞組分別繞于鐵氧體磁芯的兩側，這種工藝使得它的分布電容特小，僅為幾個pF，所以可作為脈沖信號的隔離元件。脈沖變壓器傳遞輸入、輸出脈沖信號時，不傳遞直流分量，PLC使用的數字量信號輸入/輸出的控制設備不要求傳遞直流分量，因而在工控系統中得到了廣泛的應用。

　　圖2是脈沖變壓器的應用實例。電路的外部信號經RC濾波電路和雙向穩壓管抑制常模噪聲干擾，然后輸入脈沖

　　變壓器的一次側。為了防止過高的對稱信號擊穿電路元件，脈沖變壓器的二次側輸出電壓被穩壓管限幅后進入測控系統內部。一般地說，脈沖變壓器的信號傳遞頻率在1kHz～1MHz之間，新型的高頻脈沖變壓器的傳遞頻率可達到10MHz。

　　3.繼電器隔離

　　繼電器的線圈和觸點沒有電氣上的，因此，可利用繼電器的線圈接受信號，利用觸點發送和輸出控制信號，從而避免強電和弱電信號之間的直接接觸，實現了抗干擾隔離。

　　圖3是繼電器輸出隔離的實例示意圖。在該電路中，通過繼電器把低壓直流與高壓交流隔離開來，使高壓交流側的干擾無法進入低壓直流側。

　　4.布線隔離

　　將微弱信號電路與易產生噪聲污染的電路分開布線，zui基本的要求是信號線路必須和強電控制線路、電源線路分開走線，而且相互間要保持一定的距離。配線時應區別分開交流線、直流穩壓電源線、數字信號線、模擬信號線、感性負載驅動線等。配線間隔越大，配線越短，則噪聲影響越小。但是，實際設備的內外空間是有限的，配線間隔不可能太大，只要能維持zui低限度的間隔距離便可。

　　附表列出了信號線和動力線之間應保持的zui小間距。如果受環境條件的限制，信號線不能與高壓線和動力線等離得足夠遠時，就得采用諸如信號線路接電容器等各種抑制電磁感應噪聲的措施。

 

FlexLogix System 1794-CE3 EXTENDER CABLE FOR TERMINAL BASES, 3 FT/.9M

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RSI Software Products 9324RSFBCU1 UPGRADE RSFIELDBUS CONFIG SW 64 TO 256 FB

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A06B-6093-H101 Beta Series SVU-12 12 Amp Amplifier

IC200UEX210 28 point expansion. (16) 120VAC In, (12) 120VAC Out, 120/240VAC Power Supply. (Includes IC200CBL501)

IC752CKT014 DATAPANEL 150 STARTER KIT

MTR-3N31-H-R-0-N-SRR Servo Motor Nema34 with Seal

NI 9401

WAFER-LX-800

DAM BP-7520

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1492-SPM3D130-N MCB Supplementary Protector 13 A

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SIMATIC HMI 系列面板 6AV2124-0MC01-0AX0 TP1200 精智 12 英寸，觸摸

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1738-IB4DM12 ArmorPoint 4 Point Input Module

1784-CP6 PLC-5 Communication Cable

193-KB48 3.5-4.8 A IEC Bimetallic Overload Relay

20-750-PBAY-RHBB-975 POWERFLEX 750 KIT,SIDE BUSBAR,975Amps

2090-CSBM1DE-10AF01 Kinetix Cable Single DSL 2090-Series

20AB2P2A0AYNANC0 PowerFlex 70 AC Drive 20A

GA647IFPLSR00300 GCA iFIX Plus SCADA 300 I/O Srv

GP647IFESGCLNTS GCP iFIX Optn: ESig & ERec iClientTS

IC600BF841RR 0-10Vdc Analog Input Module (8 channels)

IC647HSTCCP1M Historian Client Connection Pack 1 Users (M4 Key)

IC647TDV999 CIMPLICITY HMI Viewer Development & Runtime System

IC693MDR390LT Mixed I/O, 24Vdc Input (8 points), Relay Output (8 points) (LT)

IC756LDV001K-99 DV Development - Intel/Linux RedHat Addt'l User, Korean, Version 9.9

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PLC-5/1771 System 1771-OW16 CHANNEL-ISOLATED CONTACT OUTPUT MODULE

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44A730464-G21 Connector Kit, A30/3000 & A40 Motor Power

IC200ALG325 ANALOG OUTPUT 13 BIT VOLTAGE 8CH

IC693PCM300-MP Prog. Coproc. Mdl., 160 KB (35 KB Basic Prgm), w/Port Exp. Cbl. Modified for use by OEMs

Silver Series 9321-L2EXD PLC-2 T3 STYLE;PLC-2/1774 PLC A.I. SER 3.5 1.44M

cDAQ-9181

PCM-9375

Opt002 PCL-718/812/002

ATX M-342

PX-14S5-RS-R41

A5E00104787

AIMB-267VG

1492-SPM1D500-N MCB Supplementary Protector 50 A

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電機啟動器 3VU16400MJ00

150-CA10 Smart Motor Controller Accessory

1715-A3IO 1715 3 Slot Input/Output Base Unit

1771-IT 1771 8 Point Digital Input Module

193-EC4BB E3 Plus 3-15 A Current Relay

198-W109 ModCenter IEC Wiring Kit

2090-CPWM4DF-16AF04 MP-Series 4 m Length Power Cable

2094-BL10S Kinetix Line Interface Module

DEMOCD00011 Proficy MMI DEMO CD

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IC647ASC001 PA SDK

IC647PPSOC5 Proficy Process Systems Operator Console with CIMPLICITY - 5 Pak

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HE660BGM424 Genius BASIC Prog. Co-processor with RS-232 and RS-422/485 ports

IC646TJV000 CIMPLICITY?Tracker Display-Intel

QDA-EDT-001/L QuickDesigner Lite (download cable NOT included)

ST-3114 STXi analog input module 4 Channels, 0~20mA, 12-bit

USB-4431

PCI-1718U

ASTEC MP8-3L-2D-1E-05

ACS TECH80 SPiiPLUS PCI-4/8

POD-6601

AC6652

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1606-XLP100E-2 Power Supply XLP 100 W Power Supply

1764-MM2RTC MicroLogix 1500 with RTC Memory Module

188-K4B160 Miniature Circuit Breaker 16 A

194L-HE6E-175 194L Control and Load Switch Actuator

2090-CPBM7DF-08AF30 30 m Length SpeedTec Flexible Cable

2090-XXNPMF-16S30 Kinetix Drives 30m Standard Cable

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GC647SEP001 GCScheduler ERP Project Mod.Adapter

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IC647NCN010 CIMPLICITY HMI for CNC (1 connection)

IC690CBL711 CIMPLICITY 70 Keyboard Cable

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IC800VMA022 200 W VersaMotion servo amplifier

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IC641SWM336 LM 90-30/20 ver. 4.02, multi-language, Std. Comm., disks + paper docs.

IC800SSI228P2 28 Amp S2K Series Amplifer/Controller with Profubus, 230 VAC

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PXI-6514

IEI 威達電 BP-10S

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運行版軟件 6AV2105-2FF04-0AC0 SIMATIC WinCC Runtime 專業版 Powerpack Runtime Advanced 2048 PowerTags -> Runtime 專業版 2048 PowerTags V14

1585J-M8CBJM-1 RJ45 Ethernet Media

1756-PB72K ControlLogix DC Power Supply

188-K1D005-N Miniature Circuit Breaker 0.5 A

194E-Y100-1753-6N 100 A 194E Load switch

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BC646TDV935 Server 35,000 I/O Develop/Runtime System with Proficy GlobalCare

GC647IFESGRN00900 GCC iFIX Optn: ESig & ERec 900 I/O Run

IC200ALG630 Analog input 16 bit Thermocouple, 7 channel

IC646MDG001 GE FANUC SRTP OPC Server

IC647IFPRRN00900M iFIX Profsnl SCADA 900 I/O Runtime (M4 Part)

IC660TBA106 Terminal Assembly for IC660BBA106

IC697CMM711 Communications Coprocessor, CCM, RTU, SNP, and SNPx Protocols

IC800MCUB12160XE 50 oz-in stepping Motorcube with pulse/direction interface and encoder feedback

ControlLogix/1756 System 1756-IB16D 10-30 VDC DIAGNOSTIC INPUT 16 PTS (36 PIN)

Industrial Computers 6182H-7TRH15D VVCE 700, TOUCH, STD MEM, CNET, DC

Process Control 9358-PBNT03ENE RSBATCH NT FOR PROCESSLOGIX 03 UNITS

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ControlNet Products 1786-TNCLP4 CONTROLNET TNC COAXIAL CONN - PLUG TO PLUG

RSI Software Products 9301-2SE235JPU3R RSVIEW32 WORKS 1500-5K UPGRADE OUT-SUPT (JP)

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Motion Control 2090-DANFCT-S03 CABLE, NF, MTR FBACK FOR CABLE-MTD CONN, T, 03M

BC647MBT001 Machine Edition Traditional Development Suite with Proficy GlobalCare Complete and a hardware key

IC5002TAN0000 12" Intelligence Industrial PC, Standard Series WinNT

IC800CBL064 Use IC800CBL067 for New Applications: B0.5/3000 Motor Power Cable, 14 Meters

OC647APS30100 CSense Predictive Soft Sensor 100 KPI's

PCIe-6361

AR-B1579

SYS71838

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SL-017842 PCFS212 E12209/00

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1756-CNBRK ControlLogix Communication Module

1794-OA16 Flex 16 Point Digital Output Module

194E-CA32E-P11 194E Load switch

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20AC5P0A3AYYAEC0 PowerFlex 70 AC Drive 5 A at 2.2 kW 20A

GC646MSS001 Proficy GlobalCare Complete for Logic Developer - State Standard

HE693TCUCBL Cable, for Thumbwheel Interface Unit, (6 ft.)

IC630CHS308RR Base Unit, 8 Slots

IC647HSTSS300M-35 Historian v3.5 Standard Server 300 Points (M4 Key)

IC660BCM501 Hand-Held Monitor Battery Charger

IC695ALG608CA Conformal Coated Analog Input Module, 8 Channel voltage/current. Module does not include terminal block.

IC756WDV009CT-22 DV Development Sys Visual Basic, Traditional Chinese, Version 2.2

CompactLogix System 1769-IF4XOF2 8 BIT RESOLUTION, HIGH SPEED 4 IN/2 OUT ANLG. COMB

PLC-5/1771 System 9399-FW5DDGR RSLOGIX FRAMEWORKS DIAGRAM DEV. GET'G RESULTS GUID

Distributed I/O 1799-DSCCON D-SUB(50) I/O MATING CONNECTOR (CRIMP)

Operator Interface 2711P-T6C20D PV PLUS 600 COLOR, TOUCH, ETHERNET, DC PS

Support 9341-L5200R SUPT REINSTATEMENT CONTRACT FOR 9341L5200

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Support F1779-KFMRSERA FIRMWARE UPGRADE FOR 1779-KFMR COMMUNICATION MODUL

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RSI Software Products 9701-VWMR075AFRE RSVIEW ME STATION RT 75 DISP-WINDOWS 2000 (FRENCH)

RSI Software Products 9363-PORTAL RSPORTAL SERVER APPLICATION

Motion Control 2098-DSD-030X DRIVE, 15A/30A, ULTRA3000 W/INDEXING

A81L-0001-0101#C Ac Line Filter, 10.5 KW

IC200UEX636 6 channel Analog expansion. (4) Analog inputs & (2) Analog outputs. 120/240 VAC Power Supply (includes IC200CBL501)

IC752DEM002 Mature Products, order QuickPanel instead. DataPanel Demo Kit C

MTR-3S22-G-R-0-N-SRR Servo Motor Nema23 Flg with Seal

NI 9476

JUKI-745E-LVDS01

ADAM-4060

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IP-4PGP23

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152H-C108XBD-49 SMC-3 Enclosed Motor Starter

1738-OB16EM12 ArmorPoint 16 Point Output Module

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193-NCXP-PS-CNT E300 Power Supply Connectors

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20AB9P6A0AYNANG0 PowerFlex 70 AC Drive 9.6 A at 3 Hp 20A

GA647IFPRSR00150 GCA iFIX Profsnl SCADA 150 I/O Srv

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IC600BF911RR 5VTTL Output Module