Abstract
This chapter discusses specific techniques used to enhance the performance of data acquisition and control systems. In an industrial environment, the methods and techniques used to calculate and perform the appropriate actions at any given time are often extremely critical. Large or incorrect control actions can adversely affect the performance of the system, and can indeed prove to be extremely costly. Closed-loop control is a well-used method of controlling a system or a process. A closed loop control system is one in which the control action is dependent on the output. In this type of control system, there is continuous feedback from the process on the results of a given control action taking place. The most important features of a closed-loop control system are: increased accuracy, the sensitivity of the output/input relationship (transfer characteristic) to variations in system characteristics being reduced, reduced effects of nonlinearities, increased bandwidth, and tendency toward oscillation and instability. This chapter presents example of fluid level closed loop control system to elaborate the concept of closed loop control systems. Different terms and definitions associated with closed-loop control are also explained.
Published Version
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