With the rapid development of economy and society, the existing electrical control technology has been far from meeting the needs of actual production and life. In this paper, aiming at its own problems of poor safety performance, difficult to change and spread, the programmable logic controller is applied to achieve the goal of Mechatronics in industrial control.
Programmable Logic Controller (PLC) is a new type of automatic control device, which can organically combine microelectronics, automatic control and communication technologies. It also has the physical characteristics of small size and light weight.
Because of its simple operation and strong practicability, programmable logic controller (PLC) has been applied in many industrial sites at home and abroad, and has become the best choice to achieve mechatronics. The programmable controller can effectively improve the anti-interference ability of the electrical control system, solve some common faults in the electrical control field, and ensure the long-term safety of the electrical equipment. Therefore, this paper needs to put forward some constructive suggestions on how to better realize the application of the programmable controller in the electrical control.
The traditional electrical control system is composed of relays, contactors, electronic circuits and control switches. It adopts an inherent control mode and is applied in various industrial production. After a series of studies, it is found that this traditional electrical control system generally requires dozens or even hundreds of circuits to work through complex connections, and there are many electronic components involved in the work, which leads to the system being extremely heavy and power-consuming. Most importantly, once a fault occurs, it is necessary to investigate the large and small components in the system and consume a large number of people. Force and material force.
Therefore, in the era of industrial modernization, the traditional electrical control system is no longer suitable for industrial production, and the selection of new technology is the inevitable requirement of historical development. In order to develop a new type of electrical control system, scientists combine the simple relay logic control system with the computer with complete functions and fast response, and carry out the logical operation required by the system in the memory. At the same time, they can simplify the programming method in the computer, so that the technicians with general computer level can also carry out the electrical control system. Operation. The programmable control system is more sensitive than the general manual switch in control performance. It realizes the latest contactless contact between switch and relay, reduces the connection between lines, avoids a series of faults caused by poor line contact, and improves stability and reliability. For different production needs, different types of programmable controllers can be selected to reduce unnecessary troubles in replacement. Programmable controller uses ladder diagram language in programming. It draws the devices needed in the actual production process with corresponding graphic symbols. It is easy to understand, intuitive and readable. It is one of the most commonly used computer languages at present.
The use of timer instead of the original manual timing, can not be affected by external conditions, with high accuracy, easy to control and other characteristics. A programmable logic controller is needed to realize the functions that many original equipments could not achieve in the past. Now it has been successfully applied in the construction process of chemical industry, petroleum, architecture and so on, and has received unanimous praise. In the process of electrical control, there are three main aspects which need to use programmable logic controller, which are in turn embodied in the input of field information, the execution of programs and the control of signals.
The input of field information means that under the control of computer, the programmable controller can scan the required input points in the project according to the order of realization, and read the correct state of the input points; the execution of the program is that the programmable controller scans the instructions of the user program, and then logs according to the state of the just input points and the program instructions read now. Signal control refers to the logical control function in electrical control based on the above results, such as the corresponding output point to transmit signals. The most fundamental application of programmable controller in electrical control is the control of switching logic.
Different from the traditional control method, the switching logic control can realize the dual control of logic control and sequence control, and can complete the switching control in the process of using electrical appliances simply and quickly. This function enables the programmable controller to be widely used in production line, modular machine tools and so on. In the use of electrical appliances, there are often many continuous and dynamic changes in temperature, speed, flow rate and so on. At this time, if the programmable logic controller is used in it, the analog quantity can be converted into D/A or A/D, and then the control of the changing analog quantity can be completed. With a powerful programmable controller, centralized control of electrical appliances can be realized, and multiple devices in the electrical appliances can be controlled at the same time, which reduces the waste of manpower and material resources needed in the use of partial control. At this time, if one of the control objects fails and fails to work properly, the other control objects can only stop running. In addition to the Unified overall control of the electrical components, a special programmable controller is also needed for each control object. These programmable controllers can transmit signals to each other and complete the control of the control object by listening to the response and instructions of the other party. In this case, when one of the programmable controllers fails, it will not affect the normal operation of other programmable controllers. In the aspect of motion control of operating object, programmable controller can not only accomplish the conventional linear motion control, but also perform the circular motion of controlled object, and use special motion control module to accomplish the task with high difficulty coefficient. Programmable controller is widely used in data processing. Not only can the data be collected, analyzed and processed, but also the data can be transmitted and converted. In large scale operating systems, the data processing function of PLC has played an extremely important role. According to the discussion in this paper, many functions of programmable controller can be widely used in electrical control, thermostatic element and the development prospects are very broad. However, in the specific application process, we need to understand the links between the various production links and the detailed requirements for different control systems more clearly. In the aspect of electrical control, the hardware structure of the whole system is simplified, and the operation and control system based on programmable logic controller is realized as soon as possible, so as to reduce energy consumption and improve the utilization rate of electrical components.