October 2007

Special Report: Process Control and Information Systems

Gage multivariable predictive control motility to guide support

Manipulated variable analysis is much simpler than controlled variable analysis for determining controller health

Kern, A.G., Tesoro Corp.

"Motility" is a biological term that describes cell activity. Cells with high motility are active and productive. Cells with low motility are sluggish and produce little, despite an otherwise healthy appearance. This terminology can be applied to multivariable predictive controllers (MPCs). MPCs with active manipulated variables (MVs) are healthy and productive. But MPCs with MVs that rest idly against limits are of limited value, despite giving the appearance of productive MPCs. Gaging MPC motility is easy and helps clarify the best course of action with regard to MPC. High motility indicates a healthy MPC that is busy controlling the process and capturing earnings, and that is fit to s

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