October 2003

Special Report: Improving Process Control

Enhance process control performance

Properly incorporating summers into a control configuration can increase benefits for nominal cost

Smith, C. L., Cecil L. Smith, Inc.

When developing control configurations, functions such as signal selectors (auctioneers) and split-range tend to get proper consideration. Simple summers should also fall into this category, but are typically overlooked. With digital controls, summers are readily available and cost nothing. Often they can be applied to improve control performance in multivariable applications. In practice, all process control applications are multivariable. Furthermore, all have some degree of interaction, which means that the following statements apply: A final control element affects two or more of the measured variable inputs to the controllers (the controlled variables). This statement applies to on

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