Por que le formula de la desviación estándar (STDEV) no calcula correctamente , inclusive con el ejemplo del manual del process book pag 165 no calcula el valor correctamente , ver archivo adjunto , este valor lo calculamos con el exel y no coincide
Hi, I have a 'flowrate tag' in (Nm3/hr) which I need to be totalized between 6am to 2pm each day only when 'condition tag' is 1. For e.g:- @ 9:00am 'Condition tag' =1 (Totaliser should start) & @9:40am it becomes 0 (Totaliser should stop), (Process-1) @ 10:10am 'Condition tag' =1 (Totaliser should start) & @10:40am it becomes 0 (Totaliser…(Show moreShow less)
Thanks for the reply Mr.Sun. Actually daytime of condition is not fixed. I need to totalize "flowrate tag" only when condition tag=1, it's is independent to time. I need to totalize "flowrate tag" and show as A(6am to 2pm),B(2pm to 10pm) and C(10pm to 6am) shift totalizer value. Can we do this in Pi expression?