This paper studies the application of Programmable Logic Controller (PLC) in electrical control, and makes some simple introduction to the advantages, working principle and programming method of Programmable Logic Controller (PLC), so that people can know more about Programmable Logic Controller (PLC) and Programmable Logic Controller (PLC) in electrical control system. The application provides some useful reference. As a modern automatic control device, the structure of programmable controller is complex and changeable. It includes computer technology, automation technology, intelligent technology, communication technology and other technologies. It can not only improve the efficiency and safety of the equipment, but also be applied by operating and controlling the program with a computer processor. In the development and construction of new products. Programmable Programming Controller (PLC) adopts a digital electronic operation control system, which has the advantages of simple operation, high reliability and strong anti-interference. Therefore, it is widely used in electrical control system, and its advantages are mainly reflected in the following aspects. As the basic programming language of PLC, ladder diagram language has the advantages of high recognition, specific image and convenient use, which reduces the operation difficulty of staff. The electrical control system in industrial production has been improved and improved, and the work efficiency has been improved. With the continuous development of science and technology and society, the functions of programmable logic controller (PLC) are becoming more and more perfect. Besides the basic functions, it also has the functions of automatic diagnosis, intellectualization, remote input and output, timing, calculation, graphics display and dynamic combination display. The system control changes from discrete to continuous flow mode, and improves the control level and quality of equipment.
。 Compared with the traditional electrical controller, the anti-interference system is embedded in the PLC system, which can filter the radio wave, interfere with the radio wave, isolate the photoelectricity and so on. In the adverse environment, it can also be centralized sampling and output, improve the adaptability of the equipment to the harsh environment, enhance its anti-interference ability, and provide guarantee for the stable operation of the system.
When the equipment fails, the programmable logic controller can start the self-diagnosis system and locate the location of the fault accurately, which is beneficial to the development of electrical maintenance work. PLC fault handling process, as shown in Figure 1. The volume of the control panel of the programmable logic controller is reduced by nearly half compared with the traditional relay, the use of wiring is reduced, not only the volume is greatly reduced, but also the cost of production is reduced, the economic benefits are greatly improved, and the development process of modern industrial automation is promoted. Now the programmable logic controller (PLC) has a relatively perfect product system. There are different types of products for users to choose. It has a strong versatility and enlarges the application scope of the programmable logic controller. As one of the pillars of modern electrical control system, the programmable controller has strong anti-interference function and accurate fault self-diagnosis and repair function, which not only ensures the safety and reliability of equipment operation, but also improves the technical level of electrical control. In order to better adapt to the electrical control system, the programmable controller greatly improves the universality of the equipment in its design. Firstly, input function is used to input information. The system of PLC makes instructions, and records and reads them accurately and in real time according to the actual situation of the scene. Secondly, the operation of the operation system. PLC enters the logic and arithmetic program according to the instructions issued by the operator, and calculates the specified input instructions. Finally, the operation of logic control function. According to the logical operation results given above, the system is designated to communicate, so that the corresponding system can make the functional response required by the user, and complete the whole workflow of the controller. The programmable logic controller operates the instructions step by step according to the continuous scanning mode in the working process.
The whole scanning work includes sample input, system processing, communication processing, result output, etc. It has the advantages of fast running speed and high accuracy of data processing, and greatly improves the working efficiency. Programmable Programming Controller (PLC) plays an important role in electrical control system. Therefore, we should strengthen the system equipment of programmable logic controller, ensure that the electrical control system is in a safe and efficient working state, and better serve the society and the people. Practice shows that programmable logic controller (PLC) has many advantages, such as perfect system, excellent technology and high reliability, so that it can quickly occupy the market in electrical control. Different from the traditional relay circuit, the switch control mode of programmable logic controller (PLC) has changed from the original single equipment to the whole production line, such as modular machine tools and production lines, which greatly reduces the investment of industrial production costs, improves the work efficiency and is conducive to maximizing the economic efficiency.
Benefit. Programmable Programming Controller (PLC) has the ability to control the electrical equipment of circular and linear trajectories.
According to the object’s trajectory, PLC starts the sensor operating system to control the trajectory’s speed and direction, such as elevator, robot and machine tool. The production of most modern products depends on the electrical control system.
In the production process, the changes of temperature, humidity, pressure, speed, liquid flow rate and height and other main parameters need to be recorded and monitored in time. This link has a large workload and is very complex, but the programmable controller can be implemented by D/A converter. Timely processing improves the accuracy and efficiency of the programmable controller.
This electrical control method is to set up a main programmable controller, through which the centralized monitoring operation of each device is carried out, responsible for the information connection and transmission between the various devices. The total fractional control system has clear division of labor and unified command operation issued by programmable logic controller, which can make each equipment perform its own duties and avoid the shortcomings of inaccurate information transmission and complex operation among single equipment. At the same time, when one of the program control requirements changes, the programmable controller can give instructions to the equipment in time, so that all the equipment can stop running, and improve work efficiency. This electrical control mode is that each control object is equipped with a programmable controller, which transmits information and transmits instructions through multi-level programmable controller. The multi-level control mode of independent electrical appliances can grasp the information of each control object in detail and improve the accuracy of control. In addition, when a PLC equipment fails, it will not affect other control objects, and the damage loss can be minimized. Today, thermostatic element with the rapid development of science and technology, people should improve their understanding of the programmable controller, explore and research constantly, find out better control measures to improve the programmable controller, and improve the stability, safety and efficiency of the programmable controller to the greatest extent. Improving the application level of programmable logic controller provides guarantee for the quality of electrical control in our country, and constantly improves the pace of development in the field of electrical control in our country.