A Wiley-lnterscience Publication

DIGITAL CONTROL The revolutionary advances in computer technology today have made it possible to replace conventional controllers with digital computers. Digital control thus refers to the control scheme in which the controller is a digital device, generally a digital computer. This means that we can make use of a much more advanced control logic and versatility than those made possible with conventional analog controllers. On the other hand, we also need an interface that connects a computer with real plants. In particular, Measurement is made at discrete instants in time Data must be spatially discretized to allow digital data handling In other words, digital controllers can handle data that are discretized both in time and space. The former discretizatio