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首頁(yè) 新聞中心 行業(yè)動(dòng)態(tài) PLC模擬量的計(jì)算真的那么難嗎?看完這個(gè)你就秒懂!

PLC模擬量的計(jì)算真的那么難嗎?看完這個(gè)你就秒懂!

來(lái)源:聯(lián)誠(chéng)科技
發(fā)布時(shí)間:2024-08-29
瀏覽:615

PLC世界里,模擬量的計(jì)算往往讓人感到頭疼。你可能會(huì)想:“這不過(guò)是一些簡(jiǎn)單的電壓、電流換算,怎么會(huì)這么復(fù)雜?” 然而,當(dāng)你面對(duì)各種分辨率、不同的電壓、電流范圍,突然感覺(jué)這些簡(jiǎn)單的計(jì)算好像變成了天書(shū)。

 

別擔(dān)心,今天我們就來(lái)揭開(kāi)這層迷霧,讓你輕松掌握PLC模擬量的計(jì)算。不需要翻看繁雜的資料,這一篇就足夠了!


PLC模擬量


什么是模擬量的計(jì)算?

PLC中的模擬量計(jì)算,主要涉及將物理世界的電壓或電流信號(hào)轉(zhuǎn)換為PLC能夠理解的數(shù)字信號(hào)。這些數(shù)字信號(hào)經(jīng)過(guò)處理后,PLC能夠根據(jù)編程進(jìn)行相應(yīng)的控制操作。不同的PLC有不同的分辨率,而分辨率越高,信號(hào)轉(zhuǎn)換的精度就越高。

 

電壓信號(hào)的計(jì)算


1. -10—10V的電壓信號(hào):  

當(dāng)我們處理-10V到10V范圍的電壓信號(hào)時(shí),在12位分辨率的PLC中,該信號(hào)會(huì)被轉(zhuǎn)換為-2048到2047的十進(jìn)制數(shù)。而在16位分辨率下,同樣的電壓信號(hào)則被轉(zhuǎn)換為-32768到32767的十進(jìn)制數(shù)。

 

2. 0—10V的電壓信號(hào):  

處理0到10V的電壓信號(hào)時(shí),在12位分辨率下,該信號(hào)被轉(zhuǎn)換為0到4095的十進(jìn)制數(shù)。而在16位分辨率下,同樣的電壓信號(hào)被轉(zhuǎn)換為0到65535的十進(jìn)制數(shù)。


PLC廠(chǎng)商


電流信號(hào)的計(jì)算


1. 0—20mA的電流信號(hào):  

對(duì)于0到20mA的電流信號(hào),在12位分辨率的PLC中,該信號(hào)會(huì)被轉(zhuǎn)換為0到4095的十進(jìn)制數(shù)。而在16位分辨率下,則被轉(zhuǎn)換為0到65535的十進(jìn)制數(shù)。

 

2. 4—20mA的電流信號(hào):  

處理4到20mA的電流信號(hào)時(shí),在12位分辨率下,該信號(hào)被轉(zhuǎn)換為819到4095的十進(jìn)制數(shù)。而在16位分辨率下,同樣的電流信號(hào)則被轉(zhuǎn)換為13107到65535的十進(jìn)制數(shù)。

 

這些數(shù)值并不是固定的,不同的PLC廠(chǎng)商可能會(huì)有自己的分辨率標(biāo)準(zhǔn),因此在具體項(xiàng)目中,務(wù)必查閱相關(guān)的技術(shù)手冊(cè)進(jìn)行確認(rèn)。


PLC模擬量的計(jì)算


模擬量輸入配線(xiàn)注意事項(xiàng)


計(jì)算歸計(jì)算,接線(xiàn)也是至關(guān)重要的一環(huán)。即使你已經(jīng)計(jì)算得天衣無(wú)縫,如果接線(xiàn)出錯(cuò),那結(jié)果就可能差之毫厘,謬以千里。以下是一些常見(jiàn)的模擬量輸入配線(xiàn)注意事項(xiàng):

 

  • 1. 使用屏蔽雙絞線(xiàn)并連接屏蔽層: 屏蔽層的主要作用是防止外部電磁干擾影響信號(hào)質(zhì)量,通常應(yīng)將屏蔽層接地。


  • 2. 未使用的輸入端子要短接: 當(dāng)一個(gè)輸入端不使用時(shí),將V IN 和COM端子短接,防止浮動(dòng)信號(hào)導(dǎo)致不必要的干擾。


  • 3. 模擬信號(hào)線(xiàn)與電源線(xiàn)隔離: 模擬信號(hào)線(xiàn)應(yīng)與AC電源線(xiàn)、高壓線(xiàn)等保持距離,避免信號(hào)受到干擾。


  • 4. 電源線(xiàn)上安裝濾波器: 如果電源線(xiàn)存在干擾,可以在輸入部分和電源單元之間安裝一個(gè)濾波器,以確保信號(hào)的穩(wěn)定性。


  • 5. 上電順序: 正確的上電順序是先給CPU單元上電,然后再給負(fù)載上電。斷電時(shí)則反過(guò)來(lái),先切斷負(fù)載的電源,再切斷CPU的電源。


PLC的分辨率


雖然模擬量的計(jì)算看起來(lái)有點(diǎn)復(fù)雜,但只要掌握了正確的方法和技巧,其實(shí)也沒(méi)那么難。無(wú)論你是在面對(duì)電壓還是電流信號(hào),只需根據(jù)具體PLC的分辨率進(jìn)行換算,并嚴(yán)格按照接線(xiàn)規(guī)范操作,就能確保系統(tǒng)的可靠性和精確性。


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            <h2><span id="7l9kgtqgo"    class="lcicon icon-liuyan"></span>產(chǎn)品試用申請(qǐng)</h2>
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            <div   id="7l9kgtqgo"   class="base_info">感謝關(guān)注聯(lián)誠(chéng)科技,請(qǐng)?zhí)顚?xiě)以下信息,我們將第一時(shí)間聯(lián)系您!</div>
            <div   id="7l9kgtqgo"   class="base_box_title"><h4>基礎(chǔ)信息</h4></div>
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                    <label><i>*</i>公司名稱(chēng)</label>
                    <input type="text" class="input1" required autocomplete="off" id="theme" name="theme" placeholder="公司名稱(chēng)">
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                    <label>電子郵箱</label>
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                    <label>咨詢(xún)產(chǎn)品</label>
                    <input type="text" class="input1" autocomplete="off" id="product" name="product" placeholder="產(chǎn)品系列或者產(chǎn)品型號(hào),如:EC400">
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            <div   id="7l9kgtqgo"   class="base_box_title"><h4>需求信息</h4></div>
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                <textarea class="msg" id="Intro" required name="Intro" placeholder="1、采購(gòu)量;2、對(duì)當(dāng)前產(chǎn)品的性能指標(biāo)需求或者問(wèn)題;3、產(chǎn)品主要用途;4、合作類(lèi)型"></textarea>
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