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SESK: Stuff Everyone Should Know · sesk.info/eng-setpoint-process-variable-error

In feedback control, what is the setpoint?

The setpoint is the desired value of the process variable.

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  1. The sensor's noise
  2. The actuator's maximum output
  3. The desired process value ✔

Why: The process variable is what the sensor measures, while the setpoint is the target. Their difference is the control error used to calculate corrective action.

Huh, didn't know that: Steady-state error is the final difference between process variable and setpoint after transients settle.

The dad joke
The setpoint had goals, and the process variable had progress reports.
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References

Answer: The desired process value. The process variable is what the sensor measures, while the setpoint is the target. Their difference is the control error used to calculate corrective action.

  1. NI, The PID Controller and Theory Explained www.ni.com/en/shop/labview/pid-theory-explained.html
    The set point is the desired or command value for the process variable
    Checked 2026-10-10.

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