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IC646MXN001,

IC646MXN001

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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HE693DNT250 DeviceNet Scanner (master) module for Series 90-30.

IC648CTL970 CIMPLICITY Control 90-70 Annual Maintenance

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WS02-CXPC1-E5.0 Windows版(2000/xp)

1492-RTB8P 8-Pole Push-In Style Rtb

WinCC 上位監(jiān)控軟件 6AV6381-1BF06-0DV0 "WinCC?V6.0 RT?64K?（64K 外部變量）"

變送器 3RS17221ET00

1497A-A9-M7-0-N Control Power Transformer

1606-XLRED20-30 1606 Power Supply

1768-PA3 CompactLogix L4x AC/DC In Power Supply

188-K4D005 Miniature Circuit Breaker 0.5 A

194R-B20-1753 BS88 194R Disconnect Switch

2090-CPBM7DF-10AF12 MP-Series 12 m Length Cable

2090-XXNPMP-14S07 MP-Series 7 m Length Power Cable

CBL-13-MP-20 Power cable for MTR-1220 or MTR-1235 or MTR-1300 or MTR-1400 or MTR-1N series stepping motors. 20 feet

GC647WFL010 Proficy GlobalCare Complete for Proficy Workflow - 10 User License

IC200PWR202LT POWER SUPPLY WITH EXPANDED 3.3VDC 12VDC INPUT (LT)

IC646TBLSS30K Proficy Troubleshooter for Intelligent Historian for Hist 30000 Points

IC647NMA000 CIMPLICITY HMI Marquee Device Communications

IC693ACC305 EEPROM Chips (qty 4)