Control in Systems - Feedback and Input, Process & Output Control

Control in Systems
Feedback
Definition
Mechanism of Feedback
Negative Feedback Control
Input, Process and Output Control
Positive Feedback
Negative Feedback
Input, Process and Output Control

1. Management Information Systems Control in Systems Feedback (Positive & Negative) Input, Process and Output Control Prepared By: Mohammed Jasir PV Asst. Professor NBS, Koratty Contact: 9605 69 32 66

2. Control in Systems Feedback (Positive & Negative) Input, Process and Output C ontrol

3. Feedback The mechanism of feedback has a very simple definition: "the return to the input of a part of the output" It is data about the performance of a system The information measuring the goals and providing control to the system It provides a perfect regulatory mechanism

4. Definition Feedback generally as "information about the gap between the actual level and the reference level of a system parameter which is used to alter the gap in some way",

5. Mechanism of Feedback

6. Types of feedback Positive feedback Negative feedback

7. Positive Feedback P ositive feedback is defined as a positive loop gain around a feedback loop Positive feedback is in phase with the input, in the sense that it adds to make the input larger Positive feedback tends to cause system instability Positive feedback is also known as regenerative feedback

8. Negative feedback is also known as degenerative feedback Feedback that reduces the output of a system Negative feedback tends to make a system self-regulating I t can produce stability and reduce the effect of fluctuations Negative Feedback

9. Negative Feedback Control Negative feedback control is system means keeping the system operating within certain limit of performance

10. Input, Process and Output Control

11. Input, Process and Output Control Input Process Output Storage Feedback

12. Input Taking data from an external source and entering it into the system. Can be done either Manually / Automatically Manually: - Keyboards are often used to enter data into a system Automatically: - Data is sometimes fed into a system using hardware such as OMR and Sensors Process An action performed on the data such as: Search Sort Calculations Processing data is important as it leads to useful output from the system

13. Data can be outputted from a system in a variety of ways: Printed, On Screen, Sound, Light Output essentially deals with any data that is leaving the system Output If data doesn’t need to be output immediately after processing it may be saved for later use Stored data may use to process new – the combination of data forming new outputs It is often kept on a storage medium such as a hard drive If data is saved to a disk then it becomes an output Stored data on a disk and using it later then it becomes an input Storage

14. When data is processes and output it is sometimes fed back into the system These are often used in real-time systems such as autopilot systems If no user interaction is required when data is fed back into the system then this is an open loop If a user is prompted to do something when data is fed back into the system then this is known as a closed loop Feedback

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