Introduction to Digital Control Systems
In the control systems, we have discussed so far, the signal at every point in the system is a continuous function of time. In such control systems analog controllers are used to produce continuous time varying control signals. The controller is the portion of the system that does the controlling operation. The portion of the system that is to be controlled is called the plant or the controlled system.
In analog control system the controller is made up of resistors, capacitors, operational amplifiers, etc. A digital controller is in the form of programmed digital computer. Digital controllers will have analog devices for interfacing with the plant or the control system. As compared ...