The term “plant-wide control” is used here to describe the use of advanced software that sits above (or on top of) the individual PID controllers running a number of process units in a plant.

Depending on the technology employed, this advanced process control software can perform a variety of predictive, scheduling, supervisory and/or optimizing computations. The most common architecture in industrial practice has the plant-wide software compute and transmit set point updates to a traditional platform of individual PID controllers.

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