October 2013

Special Report: Cyber Security and Process Control

Improve your choice of process control algorithms

This algorithm, when properly tuned, can greatly reduce the quantity of off-spec material made from a process upset. It can be the largest contributor to the benefits captured by improved process control.

King, M. J., Whitehouse Consulting

Within the distributed control systems (DCS), commonly used in the hydrocarbon processing industry (HPI), lies a rarely-used version of the proportional-integral-derivative (PID) control algorithm. This algorithm, when properly tuned, can reduce by a factor of four the quantity of off-spec material made during a process upset. As such, it can be the single largest contributor to the benefits captured by improved process control. Basics Most control engineers are familiar with the conventional form of the PID algorithm, which determines the controller output, M, based on the controller error, E:  (1)The algorithm has tuning constants controller gain, Kc, integral time, Ti, a

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