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一般工業(yè)控制系統(tǒng)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(tǒng)工作穩(wěn)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(xiàn)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(xiàn)場僅保持信號，不直接發(fā)生電的。工控裝置與現(xiàn)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(fā)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(fā)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(chǎn)生的電磁干擾，被控設備的各種干擾很難反饋到輸入系統(tǒng)。

　　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(shù)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(shù)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(shù)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(tǒng)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(jīng)RC濾波電路和雙向穩(wěn)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(wěn)壓管限幅后進入測控系統(tǒng)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(fā)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(xiàn)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(chǎn)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(qū)別分開交流線、直流穩(wěn)壓電源線、數(shù)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(huán)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。

 

2090-CSBM1DF-14AA50 Kinetix Cable Single DSL 2090-Series

2090-XXNFMF-S07 Kinetix Drives 7m Standard Cable

BC646SJM365 Sol Provider license w/CME - Japan Only

GC646MODEV Proficy GlobalCare Complete for Motion Developer S/W

GF-0912R/FOW Connecting FlashCable to Fowler Sylvac, Metronics, Mettler, Omega, Tol edo (FOW).

IC200UEX011 14 point Exp.(8) 24VDC In, (6) Relay Out, 120V/240AC Power Supply (inc ludes IC200CBL501)

IC647CSPR050 Proficy Cause+ for Inbligent HMI/SCADA Runtime Server - 50X monitored KPIs

IC655CPU500RR Series Five CPU (with 4K Reg and I/O Rack Terminator)

IC692MAA541RR 16 AC b/ 12 Triac Output 120 Vac PS

IC698CRE020 PACSystems RX7i High Availability 700mHz CPU

IC800VMBR040 VersaMotion amplifier external braking resistor- 40 Ohm/400 W

SLC/1746 System 1746-IM8 AC INPUT MODULE FOR PROGRAMMABLE CONTROLLER

Industrial Computers 6180W-15KP2KHDC VERSAVIEW 15-INCH WORKSTATION, KEYPAD

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ControlNet Products D1771-6.5.123 CTRLNET ADAPTR MOD.1771-CAN,ACNR,SER B USER MANUAL

RSI Software Products 9301-2SE250ESU3R RSVIEW32 WORKS 300-100K UPGRADE OUT-SUPT (ES)

RSI Software Products 9358-BERP03U1R UPGRADE: OUT-SUPT: RSBW BATCH ERP 1 TO 10 SERVER

Motion Control MPL-A560F-SJ24AA MOTOR,SERVO,26.8NM,3000RPM,SINGL,230V,BRK

Motion Control 2090-XXNPMP-16S20 CABLE,NON-FLEX,MOTOR POWER,MP/1326AB,16 GAUGE,20M

GC646TDV075 Proficy GlobalCare Complete for Server 75 I/O Develop/Runtime System

IC641SWP061 Series 90 PCM Development Software

IMC-105E-1-D Stepping Motor Controller, Enhanced, 5 Amp

PSPC-DC10/EL Prof Shop Floor SPC DC 10 User w/ eSig

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PCL-858B

NEVO+600M-1113-ADGE

P4MK2-GL

HS486VGA

IPC2-56K-63

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數(shù)字量輸入/輸出模塊SM 6ES7 323-1BL00-0AA0 DO/16，DI/16，光電隔離，40pin 前連接器

行程開關 3SE53220SD23

運行版軟件 6AV2105-3MM04-0AE0 SIMATIC WinCC Runtime 專業(yè)版 65536 PowerTags V14 Upgrade V11..V13 -> V14

1585J-M8CBJM-32 RJ45 Ethernet Media

1756-PSCA2K ControlLogix Adaptor

188-K1D100 Miniature Circuit Breaker 10 A

194E-Y25-1756-6N 25 A 194E Load switch

2090-CFBM7E7-CDAF20 MP-Series 20 m Length Feedback Cable

2090-UXNFBY-S05 Y-Series 5 m Length Feedback Cable

BC646TPR700 ProServer 700 I/O Runtime Sys with Proficy GlobalCare

GC647IFPLDV00150 GCC iFIX Plus SCADA 150 I/O Dev

IC200CBL505 I/O Expansion cable, 0.5 meter long

IC646MPMU01 Logic Developer PLC Nano/Micro Upgrade

IC647IFPRSR00900C iFIX Profsnl SCADA 900 I/O Server (M1Component Part)

IC660TSA020 Terminal Assembly for IC660BBA020

IC697CPM790RR GMR Redundancy CPU, 486, 2K Triplex (voted) I/O

IC800MCUB12310XERR Stepping MotorCube 175 oz-in, Pulse/Direction, Encoder Feedback

ControlLogix/1756 System 1756-OA8 74-265 VAC 2 AMP OUTPUT 8 PTS (20 PIN)

Industrial Computers 6182H-10BRH4B VVCE 1000, KEY/TOUCH, STD MEM, ENET, AC

Process Control 9358-PBPCNT10ENE RSBATCH NT FOR PROCESLGIX PC BASED PHASES 10 UNITS

Operator Interface 2711P-RBB15 PV PLUS 1500 KEY/TOUCH REPLACEMENT BEZEL

Support 9355-RSLINXCON RSLINX OPC CLNT APP SERVICE - PER DIEM (2 DAY MIN)

Support 9351-OSFR SUPT REINSTATEMENT CONTRACT FOR 9351OSF

ControlNet Products 1786-FSB500 200 MICRON BULK CABLE 500 METERS (1640 FT)

RSI Software Products 9301-2SE2400DEU2 RSVIEW32 WORKS 300-32K UPGRADE IN-SUPT (DE)

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Motion Control MPL-A310P-SK24AA MOTOR,SERVO,1.58 NM,5000RPM,SINGL,230V,BRK,4.2KG

Motion Control 2090-DANPT-16S04 CABLE, NON-FLEX, MTR PWR, CABLE-MTD CONN, 16AWG, 0

BC647MPS101 Logic Developer PLC Standard Edition with Cable with Proficy GlobalCare Complete and a hardware key.

IC5005TBW0000 15" Inbligence Industrial PC, Perbance Series Win2000

IC800MCUB12160XN Stepping Motor Cube, 50 oz-in with Pulse/Direction, NEMA 23

OC647IFDBPKM-50 iFIX 5.0 Optn: Database Pack

PCIe-8430/8

P/I-P5SVLL

聯(lián)想天工 F.T VER:B1.2

D321 PCI D320/640E1-PCL

HSB-835P

PCM-9363

1492-M5X5H1-100 Connection Products

1494H-DF3N Heavy Duty Non-Fus Safety Discon Switch

軟啟動器 3RW44456BC45

ET 200SP 7MH4138-6AA00-0BA0 稱重模塊 SIWAREX WP321

1585D-M4TBDM-6 Micro D-Code, QD Style Ethernet Media

1756-EN2TSC EtherNet/IP Hi Prof Sngl Port VPN Bridge

1794-OE4XT Flex XT 4 Point Analog Output Module

194E-CA63E-P11-PE 194E Load switch

2085-OW8 Micro800 8 Point Relay Output Module

2090-DANFCT-S12 TL-Series 12m Feedback Cable

ABICTDE0000/ABD 10.5 inch Color TFT/ TCP Label/ 24VDC/ with AB DataHighway Plus/ UL/ cUL/ CE/ UL1604

GC646PCMS01 GlobalCare Complete for Change Management Electronic Signature Module (Single)

HE697RTM700 Discontinued

IC630MDL367RR Analog Output Module, +/-10Vdc (2 channels)

IC647HSTSS5KM-35 Historian v3.5 Standard Server 5000 Points (M4 Key)

IC660BLC003 Cable w/Connectors Alpha 9823 3 Ft

IC695ALG808 Isolated Analog Output module, 8 channels, that is configurable for voltage and current. Requires high capacity terminal block IC694TBB032 or IC694TBS032.

IC756WDV009K-99 DV Development Sys Visual Basic, Korean, Version 9.9

CompactLogix System 1769-CLL3 3.28 FT (1 M) LEFT-TO-LEFT BUS EXPANSION CABLE

PLC-5/1771 System 9399-RL53GRES RSLOGIX 5 GETTING RESULTS GUIDE (SPANISH)

Distributed I/O D1794-6.5.4 8 INPUT RTD MODULE USER MANUAL

Operator Interface 2711P-T6M5D PV PLUS 600 GRAYSCALE, TOUCH, RS232, DC PS. INCL U

Support 6411-DDMCR 6411-DDMC SOFTWARE SUPPORT REINSTATEMENT

Support 9358-PLTM2100S SUPT RENEWAL CONTRACT FOR 9358PLTM2100ENE

Support F1784-CPCIDS FIRMWARE UPGRADE FOR 1784-CPCIDS COMMUNICATION MOD

RSI Software Products 9301-2SE2200DEU1 RSVIEW32 WORKS 150-300 UPGRADE IN-SUPT (DE)

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Motion Control 2098-DSD-HV220 HIGH VOLTAGE DRIVE, 47A/94A, ULTRA3000

ABK3D200C2P/DVN QUICKPANEL 6" TFT W/DVN

IC220TBK123 I/O TERMINAL STRIP, 12 POSITION SPRING STYLE W/COLOR, OUTPUT, QTY 10

IC752DPH000RR Datapanel H, 640x200 LCD with CCFT backlight. Text, bitmaps, bar graphs, real time clock. Includes integrated keypad. No touch capability.

MTR-3S33-G-R-B-E-S MTR series servo motor with resolver and brake and shaft seal

NI 9852

SBC8173

ADAM-4080

NIDEC-READ MC-030F36

FSC-1814 PCA-6010VG

EP-7KXA

1492-J6FB124 Fuse Terminal Block with LED

1492-TP28 IEC Term Blck Test Plug

軟啟動器 3RW40742BB34

CPU 模塊 6ES7 677-2AA40-0AA0 CPU 1515SP PC，4GB 備件 *

153H-C317XBD-56 SMC-3 ENCLOSED COMBINATION 317A

1746-A10 SLC 10 Slots Chassis

1786-BNCJ CNet Media Jack-to-Jack TNC Connector

193-T1AA40 0.25-0.4 A IEC Bibllic Overload Relay

20-COMM-Q PowerFlex ControlNet Fiber Media Adapter

2090-CSBM1DF-10AF09 Kinetix Cable Single DSL 2090-Series

20AC011A3AYNANC0 PowerFlex 70 AC Drive 20A

GA647IFSTRNUNLMT GCA iFIX Std HMI Unlmt Run

GP647IFPLSR00150 GCP iFIX Plus SCADA 150 I/O Srv

IC600BF942RR -10Vdc to +10Vdc Analog Output Module (4 channels)

IC647HSTCR50KM Collector Redundancy Option for Historian - Standard Server 50000 Points (M4 Key)

IC647TPR935 CIMPLICITY HMI ProServer 35,000 I/O Runtime System

IC693PTM100CA Conbal Coated Power Transducer Module

IC756MDV001J-97 DV Development - Alpha OpenVMS Addt'l User, Japanese, Version 9.7

MicroLogix 1000/1761 System 1761-NET-DNI DEVICENET INTERFACE (DNI)

PLC-5/1771 System 1771-NBV1 HIGH RESOLUTION ISOLATED ANALOG MODULE

Distributed I/O 1792D-CB18JP MAXUM ROUND MEDIA 18MM BASE, PASSTHRU FOR DNET

Communications 9351-HPUSRT INTERCHANGE FOR HP-UX RUNTIME

Operator Interface D6190-6.5.25 CONTROLVIEW AND CONTROLVIEW 300 INSTALLATION MNL

Support 9358-B03R SUPT REINSTATEMENT CONTRACT FOR 9358B03ENE

Support 9392-CDRSFRU UPGRADE TO ENGLISH/FRENCH BUNDLE

RSI Software Products 9323-L2300DUR UPGRADE: OUT-SUPT: 6200-2 BOTH TO AI-2 BOTH

RSI Software Products 9301-2SE3500PTE RSVIEW32 RUNTIME 100K (PORTUGUESE)

RSI Software Products 9356-SQLSAPALENE RSSQL FOR SAP SOLUTIONS SERVER PREMIUM

Motion Control TL-A230P-BJ34AA MOTOR, SERVO, 1.3NM, 5000RPM, 17BIT SERIAL FEEDBAC

44A739462 Series 90-30 State Logic CSE311 Upgrade to latest revision

IC200CHS003 I/O CARRIER CONNECTOR STYLE

IC694MDL390 OUTPUT MODULE 120/240 VAC 2AMPS 5 POINT ISOLATED

MSI-UNIV-WEB-25-43 Univ Web(RTIP/Dash/Web/Excel) 25 Pak-43

cFP-PG-522

AMB-2000

DRC 1000 DRC 700-1000

X8DAL-3

PCI-10S PCI-6S PCI-7S PCI-8S

SF7305 SYS71838

lnterface IBX-8501

1492-SPM2C040 MCB Supplementary Protector 4 A

軟啟動器 3RW30261BB04

電機啟動器 3VU16402MP00

150-F135NCD SMC Flex Smart Motor Controller

1732D-IB16M12M12 ArmorBlock 16 Point Input Block

1771-OGD 1771 16 Point Digital Output Module

193-ED1DB E1 Plus 3.2-16 A IEC Overload Relay

199-FSA Panel Mount Adapter

2090-CPWM7DF-08AA01 MP-Series 1m Standard Power Cable

2094-SE02F-M00-S0 Kinetix 6200/6500 Control Module

DT1008 RoboMount (Articulating DuraTouch and Keyboard Mounting Bracket)

GFK-1056 Series 90-30 State Logic Control System User's Manual

IC210NDR012 24VDC Power Source, (6) 24VDC in /(4) out (Relay 8 Amp), (2) analog bs. Not expandable,no LCD/Keypad, no cover. .

IC647BSP005 Batch Pilot Server Pak (5 Units)

IC647PRTHE010C Proficy Portal Historian Edition Client Pack 10 Users (M1 Key)

IC693CPU363 CPU 363 Module (240K Bytes configurable user memory), The battery for the CPU is now included in the CPU backplane box.

IC756ADV000E-98 DV Development - AIX Op Sys, English, Version 9.8

MSI-EFF-25 Efficiency Management Clients 25 Pack

SLC/1746 System 1746-RL70 REPLACEMENT OCTAL LABEL KIT FOR CTLG # 1746-OB32

Distributed I/O 1734-TBSQ10 10 MODULES BASES W/ REMOVABLE IEC SPRING TERMINALS

Application-specific products 9307-RSP32RENE RSPOWER32 RUNTIME

Operator Interface 2711-NF4 FUNCTION KEY STRIP PV600

Support 9302-NETR SUPT REINSTATEMENT CONTRACT FOR 9302NET

Support 9510-PPKCENR SUPT REINSTATEMENT CONTRACT FOR 9510PPKCEN

DeviceNet Products 1787-PCABL PROBE CABLE FOR 1770KFD

RSI Software Products 9301-2SE3350ZHE RSVIEW32 RUNTIME 5K (CHINESE)

RSI Software Products 9326-AD10APENE APPLICATION MANAGEMENT ADD-ON 10 USER

Motion Control MPG-A004-031S22 MOTOR,SERVO,GEAR RATIO 31,14NM,194RPM,SINGL,230V

Silver Series 1756-L1M2 LOGIX5550 PROCESSOR WITH 1M BYTE EXPANSION MEMORY

HE693IBM235 Terminal Emulation Software on 3.5" disk, (included with module)

IC648MNT071 Annual Software Maintenance for LM 90-70 Parallel Communications

QPI31200C2P QUICKPANEL COLOR 10.5" TFT

ST-4424 STXi analog output module 4 Channels, 0~10Vdc, 12bit

USB-6281

PCL-734

Nematron MB820-R

GIN-6350P R2G-6350P

HP-W460GC33

OC-B2P0-CV000

1492-RXIMTR4024-32R Mech Relay Digital Interface Module

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6ES78221AA030YA7

1497B-A10-M15-0-N Control Power Transber

1606-XLS180B AC or DC Input 12 to 15VDC Out 180W PS

1769-ARM CompactLogix Address Reserve Module

188-K4D040 Miniature Circuit Breaker 4 A

194R-C30-1753-PYN1 194R Disconnect Switch

2090-CPBM7DF-10AF30 MP-Series 30m Continuous-Flex Cable

2090-XXNPMP-14S20 MP-Series 20 m Length Power Cable

CBL-14-ED-30 Encoder cable for MTR-1235 or MTR-1300 or MTR-1400 or MTR-1N series splashproof stepping motors connected to IMC or S2K. 30 feet

GEK-90486-1 Genius I/O System and Communications User's Manual - Volume 1

IC200TBM005 I/O auxiliary spring clamp style

IC646TBLSS5K Proficy Troubleshooter for Inbligent Historian for Hist 5000 Points

IC647NMF000 Mitsubishi Melsec OPC Server

IC693ACC309 Rack Adaptor Bracket, Series One 5 and 10 Slot Racks

IC750CTR200RR PANELWARE Basic Panel Controller

IC800VMCB3050 Motor power and brake power cable for 3 kW VersaMotion servo motor- 5 meter

SLC/1746 System 1746-OB16 DC OUTPUT MODULE FOR PROGRAMMABLE CONTROLLER

Industrial Computers 6155R-7S2KH VERSAVIEW NON-DISPLAY COMPUTER

Application-specific products 6556-SCBM SLC PROGRAMMABLE PRESS CONTROL KIT

Operator Interface 2711-B6C1 PV600 COLOR KEY&TOUCH, RIO & RS232 PRINT

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Support 9307-8MGDBCR SUPT REINSTATEMENT CONTRACT FOR 93078MGDBCENE

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RSI Software Products 9358-BNT10U1R UPGRADE: OUT-SUPT: RSBATCH 03 TO 10

Motion Control MPL-B320P-MJ24AA MOTOR,SERVO,2.94 NM,5000RPM,MULTI,460V,BRK,5.1KG

Motion Control 2090-XXNPY-16S20 CABLE,NON-FLEX,MOTOR POWER,Y,16 GAUGE,20M

GFK-0402 Hand-Held Programmer Series 90-30/20/Micro Prog. Control User's Manual

IC641VPP750 VersaPro Professional Edition 50 Pack - Windows Programming Software for Series 90-70, Series 90-30, and VersaMax PLCs

MSC-C-C Obsolete- 4-20 mA in / 4-20 mA out

PSPC-DC25/E-220 Prof Shop Floor SPC DC 25 User eSig 220v

PXI-8432/4

61-600695-000

iBASE IB500

BPS-250MA2

GVPC3

MB896F-R

1492-MW9X24 IEC 9 x 24 mm Cable Marker Card

通訊處理器CP 6ES7 341-1AH01-0AE0 CP341，標準串行通訊模塊，RS232C 接口，最高76.8kbit/s,9 針Sub-D 型接口,可加載 ModbusRTU及 DataHighway 驅動

行程開關 3SE53220SJ23