Difference between Setpoint control system and Follow-up control system

Follow-up control: Here the setpoint is constantly changing. Example herefor: Trajectory of a robot

Fixed value control: Here the setpoint is constant over a longer period of time or permanently. Examples: temperature control, compressed air control.

Comparison between Fixed value control and Follow-up control system

In general, fixed value controls are easier to handle than follow-up controls.

Note: What you won't necessarily find in a textbook: With a pure P control, there is always a permanent control difference. In the case of a fixed value control with a pure P controller, it is possible to specify an "incorrect setpoint" for the controller in order to actually achieve the desired value of the controlled variable.

P Control - Achieving the desired Final Value by specifying a tricked setpoint value

Knowledge test

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Which of the following statements about Follow-up control are correct?

 The setpoint is constant permanently or over a longer period of time.

 The time changes of the reference variable w are always planned in advance.

 The reference variable w is continuously variable.

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Which answer is correct about a Setpoint Control System?

 With the Setpoint Control System the reference variable permanent or constant over a longer period of time.

 With the Setpoint Control System temporal changes of the setpoint are always planned in advance.

 With the Setpoint Control System the reference variable is constantly changing.

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