INCREASING THE FUNCTIONAL SECURITY OF THE FIRE PROTECTION CIRCUIT OF THE AUTOMATED SYSTEM

Abstract

The use of automated systems allows to increase productivity and efficiency of technological processes, to optimize work at the enterprise. The efficiency of using automated systems is affected by reliability. There are a number of principles to maintain reliability at the required level. One of these is the reliability analysis in the form of an assessment of the fault-free operation of the automated system. However, reliability is determined by other parameters that relate to the functional safety of the automated system. The main indicator of the functional safety of an automated system is the probability of its error-free operation, the value of which can be increased in several ways. In particular, this is redundancy, duplication of some elements, circuits, or even the entire system as a whole. One or another redundancy method is used depending on the goals, economic opportunities, type of industry, and the required value of the safety integrity level SIL. The main tools for assessing the safety integrity level are the established norms of functional safety in the international standards IEC 61508, IEC 61511. Depending on the established safety integrity level SIL, the enterprise implements the necessary measures to protect employees, society, equipment and products, and the environment. This paper analyzes the risks associated with the failure of elements of the fire safety circuit of the automated system. An approach to increasing the functional safety of the fire circuit has been developed, which consists in the possibility of reserving elements of the sensor subsystem, a design evaluation of the proposed redundant system has been carried out, the result of which is a reduction in the risks of failure of the automated system and an increase in the probability of its trouble-free operation.