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A servo control loop is one which responds to a change in setpoint. The setpoint may be changed as a function of time (typical of this are batch processes), and therefore the controlled variable must follow the setpoint.

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A regulatory control loop is one which responds to a change in some input value, bringing the system back to steady state. Regulatory control is by far more common than servo control in the process industries.

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Jayanta Pegha

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4y ago
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10y ago

When setpoint is changed and PV moves to SP, this is servo controls. When the disturnbances are rejected by the control system , then it is regulatory controls.

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Anonymous

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4y ago

A servo control loop is one which responds to a change in setpoint. The setpoint may be changed as a function of time (typical of this are batch processes), and therefore the controlled variable must follow the setpoint.

and,

A regulatory control loop is one which responds to a change in some input value, bringing the system back to steady state. Regulatory control is by far more common than servo control in the process industries.

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Q: What is the difference between regulatory control system and servo system?
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