This paper deals with the overload caused by excessive service requests from the environment for dynamic control systems. A method of providing gracefully degraded solutions is proposed, based on the previous work on the project dealing with the design for consistent embedded real-time control system with the goal of increasing its dependability. A syntax is defined as an enhancement of the object oriented extension of a standard real-time programming language. Further, the task program execution times are estimated for possible execution paths, providing the necessary basis for schedulability analysis in both normal and critical operation modes.