The Free On-line Dictionary of Computing (30 December 2018):

Digital Control System

    (DCS) A digital computer used for real-time control
   of a dynamic system, usually in an industrial environment,
   possibly as part of a Supervisory Control and Data Acquisition
   (SCADA) system.

   A DCS samples feedback from the system under control and
   modifies the control signals in an attempt to achieve some
   desired behaviour.

   Analysis of such digital-analogue feedback systems can involve
   mathematical methods such as difference equations, Laplace
   transforms, z transfer functions, state space models and
   state transition matrices.

   (2004-08-22)