The Assessment of the Quality of Functional Stability of the Automated Control System with Hierarchic Structure

The proposed method of assessment of the quality of functional reliability of automated control system with hierarchic structure. The functional stability of an object means its ability to store for a predetermined time the performance of its basic functions within the limits set by the regulatory requirements, in the conditions of influence of flows of failures, faults, failures. This property is closely related to the properties of stability, reliability, survivability and fault tolerance. This method allows: to determine the advisability of the functionally reliable project of the whole system by comparing the cost of its implementation with the expected positive effect (in terms of avarage work of the object to its complete failure; to find weak points of equipment that is arranged in a hierarchy and provides functional reliability which, on the other hand, reduces general reliability of the object; to use additional resources correctly to make the further work of the object more reliable.