描述

1756-OF8I

?在工業(yè)控制中，某些輸入量(如壓力、溫度、流量、轉(zhuǎn)速等)是連續(xù)變化的模擬量，某些執(zhí)行機(jī)構(gòu)(如伺服電動機(jī)、調(diào)節(jié)閥、記錄儀等)要求PLC輸出模擬信號，而PLC的CPU只能處理數(shù)字量。模擬量首先被傳感器和變送器轉(zhuǎn)換為標(biāo)準(zhǔn)的電流或電壓，如4～20mA，1~5V，0~10V，PLC用A/D轉(zhuǎn)換器將它們轉(zhuǎn)換成數(shù)字量。這些數(shù)字量可能是二進(jìn)制的，也可能是十進(jìn)制的，帶正負(fù)號的電流或電壓在A/D轉(zhuǎn)換后一般用二進(jìn)制補(bǔ)碼表示。

? ? 傳感器帶模擬量輸出，模擬量輸入，（模塊的意思是把你的電壓或電流值轉(zhuǎn)換成數(shù)字量，然后通過斜率表格就能計算出你當(dāng)前的溫度或壓力。）

? ? 如果你要求讀取溫度值或壓力值時，那你的傳感器必須帶模擬量輸出和模擬量輸出。這樣的話你買個模擬模塊，把模擬模塊跟PLC進(jìn)行連接，傳感器的模擬量輸出和輸入跟模塊進(jìn)行連接（當(dāng)然模塊上有接線圖這你不必?fù)?dān)心）。當(dāng)通上電以后，模塊自動檢測傳感器當(dāng)前的值然后把它轉(zhuǎn)換成數(shù)字量，你根據(jù)斜率表計算出它的斜率公式，這樣你就能知道它當(dāng)前的溫度值或壓力值了。

? ? D/A轉(zhuǎn)換器將PLC的數(shù)字輸出量轉(zhuǎn)換為模擬電壓或電流，再去控制執(zhí)行機(jī)構(gòu)。模擬量I/O模塊的主要任務(wù)就是完成A/D轉(zhuǎn)換(模擬量輸入)和D/A轉(zhuǎn)換(模擬量輸出)。

? ? 例如在爐溫控制系統(tǒng)中，爐溫用熱電偶檢測，溫度變送器將熱電偶提供的幾十毫伏的電壓信號轉(zhuǎn)換為標(biāo)準(zhǔn)電流(如4～20mA)或標(biāo)準(zhǔn)電壓(如l～5V)信號后送給模擬量輸入模塊，經(jīng)A/D轉(zhuǎn)換后得到與溫度成比例的數(shù)字量，CPU將它與溫度設(shè)定值比較，并按某種控制規(guī)律(如PID)對二者的差值進(jìn)行運(yùn)算，將運(yùn)算結(jié)果(數(shù)字量)送給模擬量輸出模塊，經(jīng)D/A轉(zhuǎn)換后變?yōu)殡娏餍盘柣螂妷盒盘枺脕碚{(diào)節(jié)控制天然氣的電動調(diào)節(jié)閥的開度，實(shí)現(xiàn)對溫度的閉環(huán)控制。

? ? 有的PLC有溫度檢測模塊，溫度傳感器(熱電偶或熱電阻)與它們直接相連，省去了溫度變送器。

? ? 大中型PLC可以配置成百上千個模擬量通道；它們的D/A,A/D轉(zhuǎn)換器一般是12位的。模擬量I/O模塊的輸入、輸出信號可以是電壓，也可以是電流；可以是單極性的，如0~5V，0~10V，1~5V，4~20ms,也可以是雙極性的，如+50mV，±5V，±10V和±20mA，模塊一般可以輸入多種量程的電流或電壓。

? ? A/D,D/A轉(zhuǎn)換器的二進(jìn)制位數(shù)反映了它們的分辨率，位數(shù)越多，分辨率越高，例如8位A/D轉(zhuǎn)換器的分辨率為2-8=0.38％；模擬量輸入/輸出模塊的另一個重要指標(biāo)是轉(zhuǎn)換時間。

。

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主營DCS系統(tǒng)配件
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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

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15天包退換一年質(zhì)保大量現(xiàn)貨? 國內(nèi)實(shí)力庫存商家

1756-OF8I

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