![]() The rest of the system can either be digital or analog. ![]() A digital controller is usually cascaded with the plant in a feedback system. Since the creation of the first digital computer in the early 1940s the price of digital computers has dropped considerably, which has made them key pieces to control systems for several reasons: Inexpensive Flexible Scalable Adaptable Static operation. The application of digital control can readily be understood in the use of feedback. are not producing undesired or unplanned effects. Also since a digital computer has finite precision (See quantization), extra care is needed to ensure the error in coefficients, A/D conversion, D/A conversion, etc. Since a digital computer is a discrete system, the Laplace transform is replaced with the Z-transform. Depending on the requirements, a digital control system can take the form of a microcontroller to an ASIC to a standard desktop computer. Digital control is a branch of control theory that uses digital computers to act as system controllers.
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