State based control design of MACE console system

State Based Control is a method for designing plant automation based on the principle that all process facilities operate in recognized, definable Process States. These cover normal and abnormal conditions of the process. State Based Control provides an environment for knowledge capture directly into the control design. Electronics Division, BARC is involved in the software design for the console of Major Atmospheric Cerenkov Experiment (MACE) telescope which will be set up at Hanle, India to collect the Cerenkov light associated with an extensive air shower, which develops as a result of a primary γ-ray (or cosmic ray) propagating in the upper atmosphere. The MACE console is the central control which co-ordinates the MACE telescope's subsystems like, Drive Control System, Mirror Alignment System, Camera System, MACE Console System, Data Archiving System, Sky and Weather Monitoring System, synchronously for a successful observation run. To define the real time interaction and control between all these subsystems (defined as subsystem objects in MACE console object model), state based design pattern approach has been followed. Details of the object oriented design as per the state based control of the MACE console software are presented in this paper. (author)