METHODS OF FUNCTIONAL DIAGNOSTICS AND MAINTENANCE OF INDUSTRIAL AUTOMATED SYSTEMS
Authors:   Karat ltd., VITALII LIUBCHYK  , MAZUR MYKOLA , MAKARYSHKIN DENYS ,   Khmelnytskyi National University
Published: April 2022

The paper considers the development of methods to increase the functional reliability of automated control systems of technological equipment. In automation systems, it is important to ensure a balance between reliability and safety. The introduction of additional units that increase the security of the system can reduce reliability, and vice versa. The object of research is the process of improving the functional safety and reliability of the automated equipment control circuit. Subject of research: methods of increasing the functional safety and reliability of the automated equipment control circuit. During the implementation of the stages to increase the reliability and safety of the structure of the ACS TP structure and algorithms are complicated. However, while ensuring reliability, the circuit elements and additional steps of the algorithm increase the reliability more than it decreases due to the complexity of the circuit, because these elements of the circuit and the algorithm are aimed at improving reliability. On the other hand, when the scheme and algorithms are complicated at the stage of security, all the additional elements of the scheme and algorithm, only reduce the reliability. An improved method for increasing the functional reliability of automated control systems is proposed. As a result of the research, the development of the ACS TP system is proposed, which applies graph theory to the control of equipment for sewing and gluing carpet products. The technological scheme of the equipment provides supply of a carpet to sewing machines from each party and sizing machines. The sequence of activation of each element of the scheme must be carried out in a certain sequence and sequence in accordance with the technological process of manufacturing finished products. The sequence of each circuit element and the relationship between their activation can be represented as a graph. The graph of states and transitions implements the device depending on the state of the sensors of the presence of goods on one side or the other of the conveyor belt. But this graph does not take into account the initial stage of turning on the equipment. In accordance with the maintenance strategies, you need to monitor the status of the individual elements of the circuit in a given sequence. To take into account all these features of technical diagnostics and the needs of improvement, it is necessary to analyze the sequence of activation of individual elements of the circuit and develop a graph of the subsystem of functional diagnostics ACS TP. On the other hand, it is necessary to ensure the safe operation of the device. To determine the units required for commissioning, it is necessary to analyze the technological scheme of the device and the graph of states and transitions for the occurrence of conditions that threaten human health or life. In each case, it is necessary to use different methods to increase security, their selection and justification will need to be carried out at the design stage of the device. But in general, the schedule of equipment needs to be improved taking into account these negative factors in order to improve safety. In the event of any of the life-threatening conditions, the chain of the graph is broken and the system can not go into a state of readiness to turn on. Thus, there is an unconditional cessation of equipment.