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I tried to calculate manually the O/P of PI controller in our Experion DCS, the equation is:
CV (t) = CV(t- l) + Del_CVt, where
CV (t) is the current CV value
CV(t- l) is the CV at the end of previous execution cycle
Del_CVt is the incremental output in the current cycle.
Del_CVt = Kc(Et-Et-1)+ (Kc*ts)*Et/Ti,
Ti : integer time in seconds as ts ,sampling time of controller (1S) in DCS., En = Pv-Sp at this time t.
But the results not coming as the actual I got from DCS. Is there any expected reason for this different in manual calculations and DCS calculations??
CV (t) = CV(t- l) + Del_CVt, where
CV (t) is the current CV value
CV(t- l) is the CV at the end of previous execution cycle
Del_CVt is the incremental output in the current cycle.
Del_CVt = Kc(Et-Et-1)+ (Kc*ts)*Et/Ti,
Ti : integer time in seconds as ts ,sampling time of controller (1S) in DCS., En = Pv-Sp at this time t.
But the results not coming as the actual I got from DCS. Is there any expected reason for this different in manual calculations and DCS calculations??