描述

組態(tài)中使用了變量輸入監(jiān)視功能塊（PVI）、常規(guī)PID控制功能塊（PID），實現(xiàn)基本的模擬量監(jiān)視及控制功能，這兩個功能塊也是使用較多的功能塊。此外還用到了比率功能塊（RATIO）和計算功能塊（CALCU）等。組態(tài)中FF12002計算實際的回流比，YK12002用于設定回流比。SUM11023用于FI11023累計量的計算，這里需要說明的是在CS3000系統(tǒng)中，PVI、PID等功能塊具有累計功能，具體實現(xiàn)是通過在組態(tài)中把“Totalizer”一項中時間一項設置為“Hour”，而此處根據(jù)工藝要求，只在12-R01進料時累積，回流狀態(tài)時不累積，所以在組態(tài)時通過計算功能塊實現(xiàn)了這項功能，具體做法是在CALCU功能塊中編程，當12-R01進料狀態(tài)（即XV12010.PV=1）時，其結(jié)果（CPV）等于FI11023的累計量，而當12-R01進料狀態(tài)（即XV12010.PV=0）時，使FI11023的累計值（SUM）等于SUM11023的結(jié)果（CPV）的值，SUM11023編程如下：

PROGRAM
IF (XV12010.PV>0) THEN
CPV=FI11023.SUM
END IF
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