Applications for Small DMC controllers

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: We often times think about DMC controlling a significantly large process area.  However, there may be times when there is no advantage to controlling the entire process with DMC, but there is an advantage to control just a small section of the process.  One example I've seen is a DMC controller running at a high execution frequency doing combustion control on a furnace.  (Yes, there are PID overrides just in case DMC is not quick enough.)  

: Do you folks have any other examples of applications for DMC technology on a small problem?  


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