Liquid Waste Tank Farm Management with Programmable Logic Controller

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Dr. Takács Gábor
Department of Electron Devices

The thesis is about the planning, development and execution of the automation of the generated liquid waste management in the chemical industry.

The first chapter of the thesis presents the modern industrial control systems. The presentation addresses the two most widely used systems, the PLC and the DCS. In short, we get an insight into the structure and peculiarites of these two systems. With a brief comparison we can get an idea about what steps we should go through, while planning a new project, to choose the most appropriate control device.

The second chapter shows the design and construction phases of the work. It starts by presenting the used devices. It is important to note that some of these were already in use before the development, so the new choices are influenced by them. It is followed by the presentation of the tanks and the architecture of the system. This section also shows the development of the MODBUS TCP connection. The presentation of the functions of tanks finish the chapter.

The thesis is finished by presenting the installation process. First thing to do is to configure the PLC, and then download the configuration and the program into it. It is followed with the configuration of the Remote IO units. After the configuration processes, we are able to start the validation tests. That means that the instrument or device is subjected to two tests. First, we have to make sure that they meet the manufacturers specifications, secondly that they function properly. In addition to the validation procedure we have to test the communication between the PLC and the SCADA system, so we can ensure that the display is in line with the program.

Finally, the development opportunities are discussed, which includes automation and also both hardware and software development capabilities.


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