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  • A comprehensive criterion for evaluating the effectiveness of programmable logic controllers

    The choice of equipment of technological enterprises, especially when the characteristics of the equipment are close in values, remains an urgent task. In our work, to evaluate the effectiveness of programmable logic controllers (PLCs), a comprehensive criterion for evaluating efficiency is proposed, as well as a method for calculating it using numerical methods. To calculate the complex efficiency criterion, the values of the significant characteristics of the controllers selected by us are converted into points on a linear scale. To refine the calculation results, we applied one of the Newton-Cotes numerical methods, namely the trapezoid method. Next, we used the method of cubic interpolation of the obtained curves to increase the accuracy of calculations. The proposed method is simple and does not require a lot of calculations. At the same time, its application makes it possible to calculate complex PLC efficiency criteria based on characteristics relevant to a particular control process.

    Keywords: programmable logic controller, characteristics, numerical methods, trapezoid method, cubic interpolation method, aggregation of characteristics, ABAK PLC, Siemens PLC, OWEN PLC

  • Evaluation of the total efficiency of programmable logic controllers in order to implement the import substitution policy

    In this paper we proposed a method for quantifying the total efficiency of programmable logic controllers from various manufacturers. The correct assessment makes it possible to select a programmable logic controller (PLC) as part of the implementation of the import substitution policy with a domestic product of devices from competing companies that have left the Russian market. The solution of the problem is carried out by the introduction of a linear rating scale for the selected characteristics of the PLC. Quantitative assessment of the qualitative characteristics of PLCs made it possible to obtain the value of the total efficiency for the PLCs considered in the work. Total efficiency is understood as a comprehensive assessment of the effectiveness of a programmable logic controller according to the selected characteristics. In this case, the characteristics may be of a different nature. We evaluated programmable logic controllers of four manufacturers: Siemens, Yokogawa, OWEN, ABAK. Seven characteristics of the PLC were selected for evaluation: mean time between failures, number of interfaces and plug-ins, power consumption, temperature range, number of protocols used, and response speed. The possibility of implementing the import substitution policy is considered. The assessment of the total efficiency confirmed the competitiveness of domestic PLCs in relation to foreign ones. The development of the presented evaluation method will make it possible to analyze the effectiveness of complex, large control systems made up of different types of equipment. The presented method can be used over time to obtain up-to-date information about the total efficiency.

    Keywords: programmable logic controller, evaluation parameters, qualimetry, total efficiency, import substitution

  • Calculation of optimal DCS parameters using graph theory methods

    The article discusses the use of graph theory to calculate the location of elements and ways of laying information cables in a distributed control system. It describes how the use of graph theory can help improve system performance, reduce maintenance costs, and increase reliability and security. The article presents the general principles of using graph theory to solve problems related to the location of elements and paths for laying information cables in distributed control systems. The authors conclude that the use of graph theory is a powerful tool for solving problems associated with distributed control systems, and can be effectively applied to improve the efficiency of the system, reduce costs and increase reliability and security.

    Keywords: graph theory, distributed control system, Python, Matplotlib, production process optimization, automatic analysis, control system, data cable, automation

  • Automation of the pedestrian crossing control system using a motion sensor

    The article presents a study of accidents on the roads involving children and persons under the age of majority. An analysis was made of the legal norms for the protection of the rights of the child on the roadway. In addition, an additional means of reducing accidents on the roads, as well as its location relative to the pedestrian, was identified.

    Keywords: accident, traffic accident, child, children, incident, road, section, pedestrian

  • The prospect of using automated process control systems with plasma coal burning in the Far North

    To consider the possibility of saving resources from the introduction of an automated process control system (APCS) of a boiler plant with plasma ignition of coal for increased efficiency in the conditions of the Far North. To investigate automated control systems for boiler installations with various options for preparing coal for plasma ignition of the boiler, to consider their main advantages and disadvantages. To substantiate the need for the introduction of automated process control systems of a boiler plant of increased efficiency. Based on the literature review and the results of the calculation of economic efficiency, to develop a plan for the implementation of an automated control system of a boiler plant of increased efficiency for the conditions of the far north.

    Keywords: energy resources, power engineering, boiler plant, automated control system

  • The state of the automation level of energy facilities and solutions aimed at its improvement

    This paper analyzes the state of the automation level of energy facilities. The most rational method of assessing the level of automation is given: consideration of each energy facility (generating enterprises, transport companies, consumers) separately for the most effective assessment. The analysis of the level of automation of generating companies on the example of thermal power plants is given. A solution aimed at increasing the level of automation is proposed. The analysis of the level of automation of transport companies and consumers on the example of thermal energy is also given. The ways of increasing the level of their automation aimed at improving the efficiency of transmission and use of energy are proposed. The article presents a number of advantages of the introduction of automated systems at energy facilities on the example of an automated dispatch control system at power plants and substations. A number of the most promising solutions for increasing the level of automation of energy facilities are also presented.

    Keywords: automation, energy facilities, automated dispatch control, energy complex

  • Conrol system of "Smart house" by concept of "Internet of things"

    The goal of document is to develop a system which will allow user to control connected home appliances remotely using an android app. The advantages of this project are safety of using and saving human’s and electric energy. This system is separated to software and hardware module. MCU is the central device in this project, by which we can control: fan, a/c , lights and e.t.c , depending on we connect. Discussing a lot about safety of using home automation system by internet of things. Making conclusions by example Fibaro house center and his weakness of safety information. Review an app on Android and create a simple script on Lua ,so that when accessing the module via HTTP, information is displayed from it.

    Keywords: Home automation system, Internet of things, smart home, cybersafety, android, server cloud, Lua script, Web-server,serial number and key, HTTP

  • Direct synthesis PID controller design for unstable processes

    This article discusses a proportional-integral-derivative controller circuit for an unstable system with a delay in a parallel control structure. The parallel control structure has two separate controllers for tracking tasks and suppressing load disturbances. The considered controller is developed on the basis of a direct synthesis approach by choosing a separate reference model with feedback. The proposed design method is applicable to both the lower and the high-level unstable process without model reduction in the higher order process. The effectiveness of the proposed method is demonstrated through example modeling and comparison with methods published in the literature.

    Keywords: proportional-integral-derivative regulator circuit, direct synthesis, reference model, design method

  • Automation of automatic control system transfer functions calculation using the non-canceling contour method

    When presenting modern automatic control systems in the form of structural diagrams, they become bulky and unreadable, and their study requires a large number of calculations that are difficult for humans. In addition, many students studying in the field of Automation of Technological Processes and Production do not understand modern methods of calculating the transfer functions of control systems. This article discusses a method for representing structural schemes in the form of oriented graphs, which greatly simplifies the readability of schemes, and also makes it possible to write algorithms for processing automatic control systems presented in the form of graphs. The article suggests algorithms for finding transfer functions written in the C # programming language, which can become the basis for their own program for researching self-propelled guns, as well as students to check the correctness of the found transfer function.

    Keywords: graph, digraph, theory of automatic control, automatic control system, transfer function

  • System of automatic control of heat supply of industrial enterprises with the possibility of remote access

    The article proposes a system for automatic control of coolant parameters in the heating system of industrial enterprises. The system is based on PLC 150 series of OWEN industrial controllers.

    Keywords: shut-off and control valves, CoDeSys, shut-off and control valve, proportional-integral-differential controller

  • Realization of final automatic systems in scale automation projects

    Despite the rapid arrival of technology, technology development is slow. This is an effective programming. This research paper presents an example of the state of finite automata on the example of vending machines.

    Keywords: State machine, Structured text, IEC 61131-3, CoDeSys, object-oriented programming, CASE, inheritance, interfaces, methods, state

  • Designing automated process control systems using graph theory methods

    The objectives of improving production efficiency and product quality are relevant for any enterprise. One solution to this issue may be to optimize the processes of automation of production processes in enterprises. This article proposes a solution that will allow you to design the most optimal routes for network connections at all levels of the process control system, which in turn will provide significant resource savings and thus increase the efficiency of automation processes in enterprises.

    Keywords: efficiency improvement, graph theory, automated process control system (APCS), graph frame, optimization methods

  • Automated control system for the parameters of the coolant with remote access

    The use of modern innovative control systems for heat supply in the housing and communal services is the task of today. Within the framework of the program of energy-saving technologies, an automated system for monitoring and controlling the parameters of the coolant in the housing and communal services is proposed. The proposed system is based on industrial controllers with Ethernet 100 Base-T, RS-232 and RS-485 interfaces and software created in the freely distributed version of the Owen CoDeSys package.

    Keywords: shut-off valve, shut-off and control valves, CoDeSys, proportional-integral-differentiating controller, pipeline fittings