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NI 9234,

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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(qiáng)電控制部分。為了使兩者之間既保持控制信號(hào)，又要隔絕電氣方面的，即實(shí)行弱電和強(qiáng)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(kāi)來(lái)，從而達(dá)到隔離現(xiàn)場(chǎng)干擾的目的。

　　一、信號(hào)隔離

　　信號(hào)的隔離目的之一是把引進(jìn)的干擾通道切斷，使測(cè)控裝置與現(xiàn)場(chǎng)僅保持信號(hào)，不直接發(fā)生電的。工控裝置與現(xiàn)場(chǎng)信號(hào)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(lái)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(dǎo)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(gè)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(hào)與內(nèi)部電路隔離開(kāi)來(lái)，或者是把內(nèi)部輸出信號(hào)與外部電路隔離開(kāi)來(lái)，如圖1所示。開(kāi)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(kāi)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(hào)進(jìn)行直接耦合，而是以光為媒介進(jìn)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(dá)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(dá)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(gè)pF，所以可作為脈沖信號(hào)的隔離元件。脈沖變壓器傳遞輸入、輸出脈沖信號(hào)時(shí)，不傳遞直流分量，PLC使用的數(shù)字量信號(hào)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(yīng)用。

　　圖2是脈沖變壓器的應(yīng)用實(shí)例。電路的外部信號(hào)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(guò)高的對(duì)稱信號(hào)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(jìn)入測(cè)控系統(tǒng)內(nèi)部。一般地說(shuō)，脈沖變壓器的信號(hào)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(dá)到10MHz。

　　3.繼電器隔離

　　繼電器的線圈和觸點(diǎn)沒(méi)有電氣上的，因此，可利用繼電器的線圈接受信號(hào)，利用觸點(diǎn)發(fā)送和輸出控制信號(hào)，從而避免強(qiáng)電和弱電信號(hào)之間的直接接觸，實(shí)現(xiàn)了抗干擾隔離。

　　圖3是繼電器輸出隔離的實(shí)例示意圖。在該電路中，通過(guò)繼電器把低壓直流與高壓交流隔離開(kāi)來(lái)，使高壓交流側(cè)的干擾無(wú)法進(jìn)入低壓直流側(cè)。

　　4.布線隔離

　　將微弱信號(hào)電路與易產(chǎn)生噪聲污染的電路分開(kāi)布線，zui基本的要求是信號(hào)線路必須和強(qiáng)電控制線路、電源線路分開(kāi)走線，而且相互間要保持一定的距離。配線時(shí)應(yīng)區(qū)別分開(kāi)交流線、直流穩(wěn)壓電源線、數(shù)字信號(hào)線、模擬信號(hào)線、感性負(fù)載驅(qū)動(dòng)線等。配線間隔越大，配線越短，則噪聲影響越小。但是，實(shí)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(hào)線和動(dòng)力線之間應(yīng)保持的zui小間距。如果受環(huán)境條件的限制，信號(hào)線不能與高壓線和動(dòng)力線等離得足夠遠(yuǎn)時(shí)，就得采用諸如信號(hào)線路接電容器等各種抑制電磁感應(yīng)噪聲的措施。

 

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IC756SDV010K-99 DV Draw Development on Solaris Op Sys, Korean, Version 9.9

MicroLogix 1500/1769 System 1769-OW8 8 POINT VAC/VDC RELAY OUTPUT MODULE

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RSI Software Products 9324-RLD2U3DEE RSLOGIX 5000 MINI TO STD UP, DEU

RSI Software Products 9304-WRM300D WINTELLIGENT RECIPE

RSI Software Products 9358-PLTM2400U2R UPGRADE: OUT-SUPT: PLANTMETRICS 10 TO 50 WORKCELL

Motion Control 8720SM-045S5NAS1 45 KW/93 AMP, 750 VDC, AC MOTOR WITH SRS60 ENC

9650-128 Mini Protocol Converter . 128K Memory

IC200TBM005 I/O AUXILIARY SPRING CLAMP STYLE

IC698ACC701 Lithium Battery pack

MTR-1337-N-D-E-0 MTR series NEMA 34 stepping motor with series winding connection

ZA06B-0075-B403 SVMR BiS 8/3K 128K-A ST BK

20BD180A3ANNANC1 PowerFlex 700 AC Drive 20B

20G11RC2P1AA0NNNNN PowerFlex 755 AC Packaged Drive

25-EMC1-FA PowerFlex 520 Frame A EMC Plate

140XTS00206 Quantum CABLEFAST電纜, 帶 QUANTUM I/O 端子, 1.8M

294E-FD4P2P-G2 Variable Frequency Drive

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1492-SPM3C030-N MCB Supplementary Protector 3 A

軟啟動(dòng)器 3RW40362TB04

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150-FPP317C SMC Flex Repair Part

1734-OB8 POINT I/O 8 Point Digital Output Module

1783-HMS8SG4CGR Stratix 5400 12 Port Managed Switch

193-ESM-I-30A-E3T E300/E200 30 Amp Sensing Module

20-750-FLNG1-F4 PowerFlex 750 NEMA 1 Flange Adaptor Kit

2090-CPWM7DF-14AA60 MP-Series 60m SpeedTec Standard Cable

2098-DSD-HV030X-DN Ultra 3000 Servo Drive

GA646PCMS10 GlobalCare Assist for Change Management Electronic Signature Module 10 Pack

GP-0602NT-F1 GagePort LVDT NT (Full Bridge F1 Blocks)

IC5002CAC0000 12in Inbligence PanelClient H/W Only

IC647HSTAE10000KM Alarm and Events Option for Historian - Standard Server 10,000,000 Points (M4 Key)

IC647SI7M SI7:Siemens SIMATIC S7

IC693MDL655LT 24 Vdc Input, Neg/Pos Logic, 1 ms, (32 pts) (LT)

IC756HDV000K-98 DV Development - HP/UX Op Sys, Korean, Version 9.8

MSI-SDK SDK Connections

PLC-5/1771 System 1771-IC INPUT MODULE, 48V DC, 8 INPUT

Distributed I/O 1790P-T4T0 PROFIBUS,4 INPUT THERMOCOUPLE BASE, TERMINAL BLOCK

Communications 1784-CP2 CABLE ASSY, 10 FT/3.20 M, 1784-KTP, -KT, -KT2, -KL

Operator Interface 2727-T7P30D1FEU MOBILEVIEW TABLET T750 - EUROPEAN

Support 9305-RSVADFVCJPS SUPT RENEWAL CONTRACT FOR 9305RSVADFVCJP

Support 9515-RSCHM500R SUPT REINSTATEMENT CONTRACT FOR 9515RSCHM500ENE

EtherNet/IP Products 2711-B5A20 PV550 MONO KEY&TOUCH, ENET & RS232 PRINT

RSI Software Products 9301-2SE3400ZHU2 RSVIEW32 RUNTIME 300-32K UPGRADE IN-SUPT (ZH)