Description: The problems of the computerized fire alrm system structure formation based on functional-structural approach proposed by E.P. Balashov are considered. In accordance to the functional-structural approach "... the structure is defined by the function...", ie structure of a computerized fire alarm system is determined by the functions of the system. The functions tree definition is the basis for the computerized fire alarm system structure development. As a result of decomposition of the objective function of the system the functions tree formed. Basic and advanced functions are distinguished. The basic parameters of a computerized fire alarm system, such as performance, reliability, functionality the 1st level functions are defined and priority influence on the structure of the system are had. The functionality of computerized fire alarm system the 2nd level additional functions are extended, and on the quality of the system as a whole are affected. To implement the proposed functions tree the computerized fire alarm system structure shall consist of the following elements: information exchange subsystem; environment parameters measurement subsystem; information processing and management subsystem; control actuators subsystem; diagnostics subsystem; power supply subsystem. The proposed structure can be changed easily to upward functionality, expands the capabilities of the system, or downward functionality, which will allow the customer to determine the necessary system functionality and the system cost.
Keywords: functions tree, structure, functional-structural approach, the computerized fire alarm system