Introduction to Feedback and Control System

An interconnection of elements and devices for a desired purpose.

• System

• Control

• Manipulated Variable

• Controlled Variable

It is the actual response obtained from the control system.

• Output

• Input

• Feedback

• Controlled Variable

It is the quantity or condition that is varied by the controller so as to affect the value of the controlled variable.

• Manipulated Variable

• Input

• Feedback

• Controlled Variable

It may be a piece of equipment, perhaps just a set of machine functioning together, the purpose of which is to perform a particular operation.

• Plants

• Input

• Output

• Control System

The control action is independent of the output.

• Open-Loop Control System

• Closed-Loop Control System

• Feedback Control System

• Control System

The control action is somehow dependent on the output.

• Closed-Loop Control System

• Open-Loop Control System

• Process

• Input

It is the property of a closed loop system which permits the output (or some other controlled variable) to be compared with the input to the system (or an input to some other internally situated component or subsystem) so that the appropriate control action may be performed as some function of the output and input.

• Feedback

• Output

• Process

• Input

It is also known as a continuous-time signal or, more generally, a continuous-data signal.

• Analog Signal

• Digital Signal

• Process Signal

• Input Signal

It is the choice and arrangement of system components to perform a specific task.

• Design

• Analysis

• Control System

• System

In its simplest form, a control system provides an output or response for a given input or stimulus.

• Control System

• Analysis

• Output

• System