由于輸人設(shè)置點(diǎn)(Set Point).過程變量(Process Variable)和輸出控制變量(Control Variable)使用頻繁,故以縮寫SP、PV.CV代替。因均為16位整數(shù),所以許多參數(shù)必須定義成PV計(jì)量或單位或CV計(jì)量單位。例如,SP輸人應(yīng)與PV范圍統(tǒng)一,這樣PID模塊在計(jì)算誤差時(shí)可減去這兩個(gè)輸人。PV和CV值可從-3200或0’至匹配的模擬換算值32000,或從0至1000,顯示變量為0.0%至100,00%PV和CV值可有不同的定標(biāo),此時(shí)換算因子已包含在PID增益當(dāng)中。

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