With the continuous development of science and technology, in the context of the information age, the performance indicators and functions of programmable controllers have been further improved and enriched, breaking the traditional concept of programmable control, making it more and more widely used in the field of electrical control, thermostatic element even beyond the application in the industrial field, and gradually extended to building automation.
In the fields of industrialization, household automation, commerce and so on, there are also good applications in agriculture. Mechanical and electrical automation is a main direction for the development of the whole industry in the future.
Realizing industrial modernization is an important policy to conform to the four modernizations of the country. In order to achieve a good development of industrial modernization, it is necessary to lay the groundwork for electrical automation.
In the process of industrial development at this stage, programmable controller is the most important one.
The representative control equipment has played an important role in promoting the whole industrial development. To fully understand and apply the specific equipment is the necessary course to achieve the practice of electrical automation. This paper focuses on the analysis of the structure and working principle of programmable controller, the scope and advantages of its application in the process of electrical control, its role in electrical control and its specific application in electrical control, so as to improve the working efficiency of electrical control in an all-round way.
Programmable controller is a general controller, which can input the program into the central processing unit through computer programming, and use the established program to realize the automatic control of the equipment. At present, the programmable controller combines the technology of machinery, communication, automation control and computer to control the equipment automatically, which has become a special subject with ultra-high competitiveness in the automation industry.
The price of microprocessor chip decreases with the development of science and technology, so the cost of programmable controllers also decreases. Therefore, the development and application of programmable controllers are more and more close to people’s production and life. Now, programmable controllers can be used in factories, schools and even at home.
The programmable controller consists of power supply, central processing unit, memory, interface circuit of input and output, function module and communication module. Its working principle is to read the user’s programmed program one time by scanning, store these input states and data into the corresponding units in the I/O image area, then enter the user program execution stage, scan according to the trapezoidal figure we are familiar with, and then enter the output refresh stage and the central processing unit root. According to the corresponding state and data in the image area, all the output latch circuits are refreshed, and then the corresponding external devices are controlled by the circuits. Programmable controllers are characterized by simple and rapid programming, simple operation, simple installation and maintenance, stable operation, long service life, low investment and little impact on current operation. For these characteristics, traditional control can not achieve.
The following table compares the advantages and disadvantages of general switching control with relay control, single chip empty box and programmable controller control as shown in Table 1. In the process of using, the memory of the programmable controller, the central processing unit and the input-output interface circuit play an important role in controlling and communicating. The programmable controller programms mainly by scanning the information needed by the received user, then inputs the data needed by the user and connects it to the data, then stores it in the phase mapping area controlled by I/O for specific operation, and then processes and executes the functions needed by the user. Electrical equipment failure can generally be divided into two types according to its performance. The first is that the electrical equipment can not work properly because of the insufficient functional control; the second is the control imbalance caused by the non-functional fault II. Because the causes of the two kinds of faults are different, we should analyze the specific situation and give the corresponding treatment. Once problems occur in electrical equipment, we must not ignore the emergence of problems. If we do not pay attention to them, timely solutions can easily lead to further problems, thereby increasing losses. Therefore, in the case of problems, we must specifically analyze the causes, then put forward the corresponding measures to solve the problems in time, we must make specific analysis of specific problems, and formulate different solutions for different reasons.
In the actual operation, the programmable controller stores the basic information. In the control improvement work of the equipment, it is necessary to test on the spot, find out the effective improvement method in a short time, and improve the control function. Only by continuous on-the-spot investigation can we timely and accurately solve the deficiencies of the programmable controller, diagnose the problems in the equipment in time, and thoroughly analyze the causes of the problems, so as to avoid similar problems in the next work. Inspection work should also be strengthened for parts that do not often show problems in the equipment, so that the next part that may cause problems should not be omitted.
In addition, if we want to do a good job of electrical maintenance, we should check every link of the programmable controller in all aspects, carefully check every part, and make a comprehensive preparatory work to prevent some unnecessary problems.
In the stage of purchasing electrical equipment, we must study the characteristics of the products, and the purchased equipment must meet the requirements of the project. We should update and improve the electrical equipment to avoid some problems that have a huge negative impact on people’s lives because of the obsolete equipment. With the development of economy and society, electrical equipment has also been greatly improved.
The use of electrical equipment is more and more frequent in our daily life. At the same time, there are many problems in the process of use. In the renewal and development of electrical equipment, the quality and performance of equipment have been improved, which greatly facilitates people’s lives. This paper emphatically discusses the application of programmable controller in electrical control, analyses the working principle and characteristics of programmable controller and its specific application in general electrical control, and investigates and studies the problems in electrical equipment, combining with the management of electrical equipment maintenance, puts forward some references for relevant staff.
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