廈門仲鑫達自動化設備有限公司
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廈門仲鑫達自動化設備有限公司
主營產品: AB ABB GE 西門子 施耐德 ??怂共_ 英維斯 西屋 |
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:柯麗梅
在PID中有不同的物理量,例如溫度、壓力及閥門開度等,它們的量綱單位均不同,所以要進行規格化工作。
規格化概念及方法:
PID參數中重要的幾個變量,給定值,反饋值和輸出值都是用0.0~1.0之間的實數表示,
而這幾個變量在實際中都是來自與模擬輸入,或者輸出控制模擬量的
因此,需要將模擬輸入轉換為0.0~1.0的數據,或將0.0~1.0的數據轉換為模擬輸出,這個過程稱為規格化
規格化的方法:(即變量相對所占整個值域范圍內的百分比 對應與27648數字量范圍內的量)
對于輸入和反饋,執行:變量*100/27648,然后將結果傳送到PV-IN和SP-INT
對于輸出變量 ,執行:LMN*27648/100,然后將結果取整傳送給PQW即可;
現有一個檢測0—3KPa的壓力傳感器用來檢測水箱的液位高度,而水箱的高度 只有300mm,那怎樣在程序里實現標度變換?
答:用差壓變送器測液位,那是就是根據phg 1Kpa對應100MM==0.1M
3KPA 對應300MM 懂?
用PID換算就是
可以外設(I/O)或以浮點格式輸入過程變量。CRP_IN功能根據以下公式將PV_PER外設值轉換為介于 -100和 +100 %間的浮點格式值:
PV_NORM功能根據以下公式統一CRP_IN輸出的格式:
PV_NORM的輸出 = (CPR_IN的輸出) * PV_FAC + PV_OFF
PV_FAC的默認值為1,PV_OFF的默認值為0。
PV_FAC設置為300,PV_OFF為0即可,那么輸出PV即為實際值(單位為MM)
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