Feedback Control System

Feedback control Block diagram

Feedback control Block diagram


Figure 8 shows basic elements of a feedback control system as represented by a block diagram. The functional relationships between these elements are easily seen. An important factor to remember is that the block diagram represents flowpaths of control signals, but does not represent flow of energy through the system or process. Below are several terms associated with the closed-loop…


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Feedback control system Block diagram

Feedback control system Block diagram


The block diagram is to represent a control system in diagram form. In other words practical representation of a control system is its block diagram. It is not always convenient to derive the entire transfer function of a complex control system in a single function. It is easier and better to derive transfer function of control element connected to the system, separately. The…


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Feedback Controllers

Feedback Controllers


A feedback controller measures the output of a process and then manipulates the input as needed to drive the process variable toward the desired setpoint. A controller reacts to setpoint changes initiated by the operators as well as random disturbances to the process variable caused by external forces. It repeats this measure-decide-actuate sequence over and over until the…


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Control as a feedback system

Control as a feedback system


How a Process Control Loop Works in Automatic Control Systems


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Feedback control diagram

Feedback control diagram


Components of a Control Loop A controller seeks to maintain the measured process variable (PV) at set point (SP) in spite of unmeasured disturbances (D). The major components of a control system include a sensor, a controller and a final control element. To design and implement a controller, we must: 1) have identified a process variable we seek to regulate, be able to measure…


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