# What are the necessary components of a feedback control system?

**URL:** <https://forumautomation.com/t/what-are-the-necessary-components-of-a-feedback-control-system/12725>\
**Category:** Electrical\
**Tags:** controlsystem\
**Created:** [October 21, 2024, 3:11pm UTC](https://forumautomation.com/t/what-are-the-necessary-components-of-a-feedback-control-system/12725 "2024-10-21T15:11:59Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Rabert](https://forumautomation.com/user_avatar/forumautomation.com/rabert/32/6784_2.png) [@Rabert](https://forumautomation.com/u/Rabert)\
**Post date:** [October 21, 2024, 3:12pm UTC](https://forumautomation.com/t/what-are-the-necessary-components-of-a-feedback-control-system/12725/1 "2024-10-21T15:12:00Z")

</div>

A feedback control system is an essential system used in many engineering applications to sustain desired outputs by constantly modifying inputs based on feedback.

The essential elements of such a system can be described as follows:

 ![image](https://cdn.forumautomation.com/original/2X/d/d1fadef580a79bc0b6f38ba8541faf26a29e20fe.jpeg)

> # Key Components of a Feedback Control System

> # Input (Setpoint)

This is the targeted value for the controlled variable. It represents the system’s desired outcome, such as a specified temperature or speed.

> # Process (Plant)

The process (plant) is the system being controlled, which could range from a heating unit to a production line. It produces the production that must be regulated.

> # Output (Process Variable)

The actual value of the variable under control, such as current temperature or speed, is measured and compared to the setpoint.

> # Sensing Elements (Sensors/Transducers)

These devices measure the output variable and transform it into a signal that can be manipulated. They offer real-time information about the current condition of the output variable.

> # Controller

The controller compare the measured output to setpoint, determines the error (the difference between desired & actual values), and determines the corrective action required to reduce this error.

> # Actuator

This component carries out the remedial action specified by the controller. It changes the process based on the controller’s output, affecting the process variable to reach the setpoint.

> # Feedback Loop

This mechanism sends information about the output back to the controller, allowing for continual system monitoring and adjustment to ensure stability and accuracy.

> # Functionality Overview

The feedback control system works by continuously monitoring the output variable with sensors, comparing it to the setpoint utilizing a controller, & making modifications with actuators to eliminate any disparities. This closed-loop technique stabilizes operations and improves performance by responding dynamically to system changes or disturbances.

> # Example

An air conditioning unit is a typical example of a feedback control system.

Input: The desired room temperature is set via a remote.

Output: A sensor measures the actual room temperature.

Process: The process involves the air conditioning system itself.

Sensing Element: Temperature sensor that measures the current temperature.

Controller: Compares the actual temperature to the setpoint and determines necessary modifications.

Actuator: A compressor that modulates cooling in response to controller signals.

This regular interaction ensures that any variation from the appropriate temperature is quickly rectified, keeping comfort within a specific range.

> ## You can also follow us on [**AutomationForum.co**](https://automationforum.co/), [**Facebook**](https://www.facebook.com/instrumentation.control) and [**Linkedin**](https://www.linkedin.com/showcase/81532759/feed/posts/) to receive daily Instrumentation updates.

> ## You can also follow us on [**ForumElectrical.com**](https://forumelectrical.com/), [**Facebook**](https://www.facebook.com/profile.php?id=100091841583670) and [**Linkedin**](https://www.linkedin.com/showcase/91130242/feed/posts/) to receive daily Electrical updates.