Thursday, January 17, 2013

SAMA Diagrams- II


A cascaded control system, where the output of one controller acts as the setpoint for another
controller to follow, appears in SAMA diagram form like this:

In this case, the primary controller senses the level in a vessel, commanding the secondary (flow)
controller to maintain the necessary amount of flow either in or out of the vessel as needed to
maintain level at some setpoint.

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