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Applications of Programmable Logic Controller (PLC)


The PLC can be used in industrial departments of all the developed countries in industries like chemical industry, automobile industry, steel industry and electricity industry. Based on the development of all these technologies, functionality and application, the scope of the PLC increases dramatically.

1. Application of PLC in Glass Industry


From the year 1980 the Programmable-logic controllers are in use in the glass industry, and they are assembled bit by bit. PLCs are used mainly in every procedure and workshop for controlling the material ratio, processing of flat glasses, etc. With the development of PLC and increasing demand in the real world, the control mode of the programmable-logic controller with an intelligent device is applied in the glass industry. In making of a float glass, PLC itself cannot finish some controlling tasks because of the complexity of the control system and processing of huge data. For the production of glass, we make use of bus technology to construct the control mode of a PLC with a distributed-control system. This control system deals with analog controlling and data recording; the PLC is also used for digital quality control and position control. This type of control mode is a big advantage for PLC and DCS for improving reliability and flexibility of the control system.


2. Applications of PLC in Cement Industry


Along with the best-quality raw materials, the accurate data regarding process variables, especially during mixing processes within the kiln, ensures that the output provided should be of the best possible quality. Nowadays a DCS with bus technology is used in the production and management industry. By using this existing DCS control system, the PLC is in user mode of SCADA. This mode comprises PLC and configuration software. This SCADA mode comprises the PLC and host computer. The host computer consists of slave and master station. The PLC is used for controlling the ball milling, shaft kiln and Kiln of coal. To know more about these programmable-logic controllers’ function, you can go through the following project, which is given as a practical example used mostly for industrial automation. Thus, this article has covered the principle of operation of programmable logic devices or controller and its applications in various industries like glass industry, steel industry and cement industry.


3.Milk Process Automation In Dairy System Using Plc-Scada


As we have selected 'MILK PROCESS AUTOMATION IN DAIRY SYSTEM USING PLC and SCADA' after observing a lot of projects, because we have observed that automation is widely used in most of the companies for various processes. In today's generation it is needed in each field. Thus all the process needs a few operators to control automation. Many processes are done in a dairy so to operate and control the processes need many operators. Our aim is to reduce operators and to save time and money. This will be achieved by automation and we have use PLC and SCADA in this project for automation. SCADA is the software for this process. In dairy process, first of all raw milk will be collected in the tank. Then after filtration and clarification of milk will be done and collect into a balanced tank. After that pasteurization of milk will be done. Further, the process of separation of milk takes place and next standardization of milk will be done. In standardization, milk will standardize in different quality. Now after packing process will take place. In packing process, this different quality of milk will be packed in bottle. This all processes are done with automation using PLC and SCADA. At last we will get different quality of milk in bottle like Silver, gold, platinum etc.Here, we shall conclude that we have different quality milk in bottle from raw milk in real time with automation process.


4.Home Appliances - Energy Saving


This project is designed to control home appliances automatically for energy saving purpose. It is a great application of the PLC in daily life. As in daily routine we normally forget or dont care to switch off the electrical devices at our homes or offices i.e. fans, tubes, bulbs etc when we leave the room. Every device has particular power ratings according to which it consumes electricity, and the working of these devices without any use will lead to wastage of power and ultimately leads to the high electricity bills. This project can be used to avoid this problem. In this project every room will be monitored by a PLC, which will keep the record of the number of persons in every room and when it finds the no of persons in a room to be zero then it automatically cut the power line for that room. We can also make use of SCADA, which will display the status of every room.



5.PLC Working Principle with Industrial Applications


Programmable Logic Controller (PLC) is a special computer device used in industrial control systems. Due to its robust construction, exceptional functional features like sequential control, counters and timers, ease of programming, reliable controlling capabilities and ease of hardware usage – this PLC is used as more than a special-purpose digital computer in industries as well as in other control-system areas. Most of the industries abbreviate these devices as “PC” but it is also used for personal computers; due to this, many manufacturers named these devices as PLCs. The programmable logic controller is used not only for industrial purpose but also in civil applications such as washing machine, elevators working and traffic signals control. Different types of PLCs from a vast number of manufacturers are available in today’s market. Therefore, in the following paragraphs, let us study about programmable logic controller’s basics, principles and applications.

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