6SE6411-6BD22-2CA1產(chǎn)品描述:
6SE6411-6BD22-2CA1
連接傳感器至模擬量輸入 根據(jù)測(cè)量方法的不同,我們可以將電壓或電阻等不同類型的傳感器連接到模擬量輸入模塊。為了減少電磁干擾,對(duì)于模擬信號(hào)應(yīng)使用屏蔽雙絞電纜,并且模擬信號(hào)電纜的屏蔽層應(yīng)該兩端接地。如果電纜兩端存在電位差,將會(huì)在屏蔽層中產(chǎn)生等電勢(shì)耦合電流,造成對(duì)模擬信號(hào)的干擾。在這種情況下,應(yīng)該讓電纜的屏蔽層一端接地。對(duì)于帶隔離的模擬量輸入模塊,在CPU的M端和測(cè)量電路參考點(diǎn)MANA(一般是端子10和11)之間沒(méi)有電氣連接。如果參考電壓UN和CPU的M端存在一個(gè)電位差UISO,必須選用隔離模擬輸入模塊。通過(guò)在MANA端子和CPU的M端子之間使用一根等電位連接導(dǎo)線,可以確保UISO不會(huì)超過(guò)允許值。如果使用的傳感器是非隔離傳感器,在輸入通道的測(cè)量線M-和測(cè)量電路的參考點(diǎn)MAA之間會(huì)發(fā)生有限電位差UCM(共模電壓)。為了防止超過(guò)允許值,在測(cè)量點(diǎn)之間必須使用等電勢(shì)連接導(dǎo)線。
溫度控制程序功能塊設(shè)計(jì) STEP7程序允許在線和離線編輯程序,首先創(chuàng)建OB1系統(tǒng)組織塊,然后創(chuàng)建定時(shí)中斷組織塊OB35,在OB35中調(diào)用溫度控制功能塊FB58,調(diào)用FB58前提是在STEP7中安裝標(biāo)準(zhǔn)庫(kù)(Standard Library),調(diào)用過(guò)程是打開(kāi)OB35→點(diǎn)擊View→點(diǎn)擊Overview→點(diǎn)擊右側(cè)Library→點(diǎn)擊Standard Librar→點(diǎn)擊PID Control Blocks→點(diǎn)擊FB58溫度控制功能塊,在輸入?yún)?shù)時(shí),輸入背景數(shù)據(jù)庫(kù)DB1。DB1作為OB35背景數(shù)據(jù)庫(kù),背景數(shù)據(jù)庫(kù)中的數(shù)據(jù)結(jié)構(gòu)是由系統(tǒng)自動(dòng)生成,用戶不能修改,必須按標(biāo)準(zhǔn)庫(kù)中的數(shù)據(jù)格式要求輸入數(shù)據(jù),在背景數(shù)據(jù)庫(kù)中還有一些系統(tǒng)控制參數(shù)設(shè)定,有些控制參數(shù)也可以在背景數(shù)據(jù)庫(kù)中修改,打開(kāi)背景數(shù)據(jù)庫(kù)DB1,選擇參數(shù)視圖,就可以修改參數(shù)如:采樣周期、PID參數(shù)、上下限、脈沖輸出等。 在OB35中調(diào)用FB58功能,輸入響應(yīng)控制量、數(shù)字量及模擬量等,當(dāng)參數(shù)輸入完成,系統(tǒng)就可以運(yùn)行程序。在程序調(diào)用LAD顯示當(dāng)中有十幾個(gè)輸入中可以選擇必須的輸入,有些必須輸入,有些可以用系統(tǒng)默認(rèn)值,在本系統(tǒng)啟動(dòng)后輸出M6.0,啟動(dòng)FB58。設(shè)定值用變量SP_INT是浮點(diǎn)數(shù)格式必需輸入,通過(guò)觸摸屏輸人數(shù)據(jù)MW2,MW2轉(zhuǎn)化成浮點(diǎn)數(shù)MD6中,MD6作為SP_INT;過(guò)程變量輸入用PV_PER(外圍過(guò)程控制變量)輸入外圍設(shè)備(I/O)格式過(guò)程變量,即用S7—331—7KF02模擬量輸入模塊的PIW258的數(shù)字值作為過(guò)程變量,如果將此數(shù)據(jù)轉(zhuǎn)化為浮點(diǎn)數(shù),即可輸入PV_IN,梯形圖中程序PV_IN和PV_PER輸入1個(gè)即可,輸入PV_PER即簡(jiǎn)單又減少轉(zhuǎn)化控制程序的編寫,在控制功能塊中,一般常輸入PV_PER在功能塊中將PV_PER轉(zhuǎn)化為浮點(diǎn)數(shù)PV_IN,用設(shè)定值SP_INT減去PV_IN就是誤差。在系統(tǒng)中參與PID控制。
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