Discussion
What is the name of control system of CNC in which actual position is compared with input value
Answer: C
It is Servo Control.
In a closed-loop servo system, a feedback device such as an encoder or linear scale measures the actual position of the slide and sends it back to the controller, which compares it with the commanded (input) value. Any difference, the error signal, drives the servo motor until the slide is in the correct position.
Hydraulic and pneumatic describe the power medium used to drive a machine, not whether its position is compared with the input; either could be used with or without feedback. An open-loop system, as with stepper motors, sends commands without checking the result.
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