Presented by ModelingAndControl.com's Greg McMillan on January 5, 2011.

1. Interactive Opportunity Assessment Demo and Seminar (Deminar) Series for Web Labs – Feedforward Control Jan 5, 2011 Sponsored by Emerson, Experitec, Monsanto, & Mynah Created by Greg McMillan and Jack Ahlers www.processcontrollab.com Website - Charlie Schliesser (csdesignco.com)

5. Cascade Loop Block Diagram (First Order Approximation)  p1  p2  p2 K p2  p1  m2  m2 K m2  c2  f2 Primary Process K v  v  v K L2  L2  L2 Primary Load Upset  CV p  CO p  MV  PV p2 Delay Lag Delay Delay Delay Delay Delay Lag Lag Lag Lag Lag Gain Gain Gain Gain Local Set Point  DV p2 % % % Delay <=> Dead Time Lag <=>Time Constant K L1  L1  L1 Delay Lag Gain  DV p1 Secondary Load Upset  CO s Secondary PID Cascade Set Point % % K p1 Gain  CV s  m2  m2 K m2 Delay Lag Gain  c2  f2 Delay Lag Secondary Process Primary PID 20 sec Secondary Feedforward Primary Feedforward K c2 T i2 T d2 K c1 T i1 T d1 Primary:  o2  v  p1  p2  m2  c2  f2  v  p1  Secondary:  o1  v  p1  m1  c1  f1  v

7. Bias Correction of Ratio Control http://www.modelingandcontrol.com/2009/04/what_have_i_learned_-_ratio_co_1.html

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