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A02B-0265-B503現(xiàn)貨 in stock! 歡迎來電咨詢~！！

A02B-0265-B503,

A02B-0265-B503

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(shè)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(shè)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(nèi)部電路隔離開來，或者是把內(nèi)部輸出信號與外部電路隔離開來，如圖1所示。開關(guān)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(guān)量中的各種干擾脈沖都被擋在輸入回路的一側(cè)。由于光電耦合器不是將輸入側(cè)和輸出側(cè)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(cè)，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(shè)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(cè)。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(cè)輸出電壓被穩(wěn)壓管限幅后進入測控系統(tǒng)內(nèi)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(cè)的干擾無法進入低壓直流側(cè)。

　　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(qū)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(shè)備的內(nèi)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。

上億庫存，國內(nèi)外近千個倉庫，公司部分產(chǎn)品型號如下，歡迎聯(lián)系哦~！

ControlLogix/1756 System 1756-IA32 74-132 VAC INPUT 32 PTS (36P)

PLC-5/1771 System 1771-OYL REED RELAY CONTACT OUTPUT MODULE, 0 TO 24V

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Operator Interface 2711P-RBK15 PV PLUS 1500 KEYPAD REPLACEMENT BEZEL

Operator Interface D6190-6.5.7DE CONTROLVIEW DATA LOGGER USER MANUAL (GERMAN)

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284D-FHD2P3B-10-CR-SB DeviceNet Variable Frequency Drive

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IC641SWM711 LM 90-70 S/W, Ethernet Network, 3.5"/5.25" disks + paper docs.

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Operator Interface 2711P-RAK15 PVP1500/VVCE1500 KEY/COMBO TO PV1400E KEY ADAPTER

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1794-OA8 Flex 8 Point Digital Output Module

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IC647HSTSS30KM-35 Historian v3.5 Standard Server 30000 Points (M4 Key)

IC660BLA021 Cover w/Label for IC660BBA021

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IC756WDV009E-23 DV Development Sys Visual Basic, English, Version 2.3

CompactLogix System 1769-IR6 6 CHANNEL RTD/RESISTANCE INPUT MODULE

PLC-5/1771 System 9399-FW5FBGR RSLGIX FRAMWRKS FUNCTION BUILD.GET'G RESULTS GUIDE

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RSI Software Products 9701-VWMR075DEU1 RSVIEW ME STATION RT 15 TO 75 DISP UPGRADE(GERMAN)

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ABI31200C2P/ABD QUICKPANEL 10.5" TFT W/AB DH+

IC200UMB001 VersaMax Micro 64, User Program Memory Module. Compatible with VersaMaxMicro 64 only.

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25-PM2-D4P0 PowerFlex 520 1.5kW (2Hp) Power Module

2711P-RP8A PanelView Plus 6 700-1500 Logic Module

FRN3.7G11S-4CX 6.9KVA 9.0A 3.7 KW 3相AC380V/50Hz/60Hz

1492-J50 50 square mm Feed-Through Terminal Block

1492-SPM3D500-N MCB Supplementary Protector 50 A

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CPU 模塊 6ES7 516-3AN01-0AB0 CPU 1516-3 PN/DP，1 MB 程序，5 MB 數(shù)據(jù)；10 ns ；集成 X1: 2x PN 接口，X2: 1x PN 接口，X3:1x DP 接口

152H-C135XBD-50-8L SMC-3 Pump Panel w/Line Prot.Module, FB

1738-OB8EM12 ArmorPoint 8 Point Output Module

1784-U2DN DeviceNet to PC USB Interface Cable

193-NREC5ZZ E3 Plus Replacement Overload Relay

20-750-UFB-1 PowerFlex 750 Univ Fdbk Option module

2090-CSBM1DE-18AA05 Kinetix Cable Single DSL 2090-Series

20AB9P6A3AYNACG0 PowerFlex 70 AC Drive 9.6 A at 3 Hp 20A

GA647IFPRSR00900 GCA iFIX Profsnl SCADA 900 I/O Srv

GP647IFPLDV00075 GCP iFIX Plus SCADA 75 I/O Dev

IC600BF913RR 10-50Vdc Sink Output Module

IC647HSTCR20000KM Collector Redundancy Option for Historian - Standard Server 20,000,000 Points (M4 Key)

IC647TPD910 CIMPLICITY HMI ProServer 10000 I/O Development and Runtime

IC693PCM301RR Programmable Coprocessor Mod, 85K, w/Port Expansion Cable

IC756MDV000E-98 DV Development - Alpha OpenVMS Op Sys, English, Version 9.8

MicroLogix 1000/1761 System 1761-L32AWA 32 I/O MICROLOGIX 1000

PLC-5/1771 System 1771-IL ANALOG INPUT MODULE

Distributed I/O 1792D-4BV0D 4 SINK/SOURCE INPUTS, 4 CONNECTORS

Communications 9300-RADM1 SERIES A REMOTE ACCESS MODEM (DESK TOP WITH CABLE)

Operator Interface D6190-6.5.15 CNTRLVW RAM 4MB ENHANCED MEMORY CARD(6190-MB14)MNL

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RSI Software Products 9356-PRO2500U8 UPGRADE: IN-SUPT: RSSQL PROF.5000 TO 70000 TAG

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44A735538 CPU323 Upgrade Kit latest revision

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IC694ALG391 OUTPUT MODULE ANALOG 2 POINT CURRENT

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29011-061-06-R SCREW, M4 X 0.7 X 6MM PHMS

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1771-NR 1771 Analog Module

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IC210EDR008 Expansion unit, 24V DC Power Source, (4) 24VDC in/(4) out (Relay, 8 Amp)

IC647AUR005 PA Universal Reporting Client 5 Pak

IC647PRTEE010C Proficy Portal Enterprise Edition Client Pack 10 Users (M1 Key)

IC693CPU340RR CPU 340 Module, (16K Bytes user memory), 10K Reg., 3 msec/K

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HE693ADC410 4ch., +/-10Vdc Analog Input Module, 2000Vac Isolation, 14-bit resolution

IC646TRT915 1,500 I/O Point Runtime System

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Quantum Digital Input Module 開關(guān)量輸入模板

284D-FHD7P6Z-25-CR-DB-SB DeviceNet Variable Frequency Drive

CJ1W-AD081-V1 8點模擬量輸入單元（1-5V,0-5V,0-10V,-10-10V,4-20MA）分辨率：1/8000

1492-RTB14N 14-Pole Screw Style Rtb Plug

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變送器 3RS17032AD00

1497A-A3-M8-3-N Control Power Transber

1606-XLP60EQ AC or DC Input 24 to 48VDC Out 60W PS

1768-EWEB CompactLogix Enhanced Web Server Module

188-K4C160 Miniature Circuit Breaker 16 A

194R-30-NJ 194R 30 Ampere 4th Power Pole Module

2090-CPBM7DF-10AA40 MP-Series 40m Standard Cable

2090-XXNPMP-10S60 MP-Series 60 m Length Power Cable

CBL-13-ED-10 Encoder cable for MTR-1235 or MTR-1300 or MTR-1400 or MTR-1N series stepping motors connected to IMC or S2K. 10 feet

GC647SVB001 GCScheduler Visma Business Adapter