Programmable controller is a general controller, which can input the program into the central processing unit through computer programming, and realize the automatic control of the equipment by using the established program.
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.
Programmable logic controller, or PLC, is a general controller in modern industrial production. In the process of operation of the system, it is mainly based on the micro-processing function of the computer itself, in order to realize the calculation, control and timing of the operation of related machinery and equipment, and to meet the basic requirements of production for its operation. At the initial stage, the main functions of the PLC system are logic operation, sequence control and calculation. With the continuous progress of Electronic Science and technology, the PLC system is gradually developing towards comprehensive functions, and has been further applied in a wider range of fields, such as home automation, business and public utilities. The application of domain provides certain impetus for the development of social automation. 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 unit of I/O image Ix, then enter the user program execution stage, scan according to the trapezoidal figure we are familiar with, thermostatic element and then enter the output refresh stage and the central processing unit root. According to the corresponding state and data in the image Ix, all 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. 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. 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. The system developed in this paper will use S7-200 series PLC produced by German Siemens Company. Because the control core of the system is programmable controller, it needs powerful instruction set and abundant communication functions.
The German Siemens PLC selected in this paper will be able to meet the above needs. The wireless communication CP243-1 module realizes the remote configuration, programming and diagnosis of PLC. The Siemens PLC used in this system has only two serial ports.
The main station of PLC will use serial communication mode to connect with wireless communication module, current transmitter and touch screen module. The extension module of Dalian Dejia PPI is added to connect with the touch screen in Kunlun. The sensor can detect and control the conveyor. According to the field control environment, the system will adopt the following types of sensors: OMRON E3S-BT61 photoelectric sensor for product counting module; OMRON E3S-BT21 photoelectric sensor for blocking alarm and anti-collision system; and new force GE for belt deflection.
J15/30 (D) type two-stage alarm sensor; current transmitter will adopt honest PKG series; current transformer will adopt Zhengtai NLH1-0.6635 type. The traditional industrial communication mode is wired communication, but because the palletizing opportunity of this system is always moving, the electric line will adopt sliding wire or towing cable.
If the communication between the master and slave of PLC also adopts this mode, the communication will not be smooth and the maintenance will be difficult. Therefore, based on the above problems, according to the actual situation on the spot, the communication between the master and slave of the PLC in this system will adopt the wireless communication mode. The system will consist of two wireless communication modules, model KYL-1020L, working voltage of communication system is DC 5V, working current is less than 600 mA, remote control distance can exceed 600 m.
Data format: 8N1/8E1/8O1; low power, with sleep function. 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 field investigation, Diaoyi can timely and accurately solve the inadequacies of the programmable controller, diagnose the problems in the equipment in time, and thoroughly analyze the causes, 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. Moreover, if you want to do a good job in electrical maintenance, you need to inspect all aspects of the programmable controller, carefully inspect a part of the insult, and make comprehensive preparations for prevention. In the stage of purchasing electrical equipment, you must study the characteristics of the products, and the purchased equipment must conform to the requirements. Engineering requirements. We should also update and improve the electrical equipment to avoid some problems which bring great negative impact to 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 reviews 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, investigates and studies the problems in electrical equipment, and puts forward some references for relevant staff in connection with the management of electrical equipment maintenance. Examination suggestions, hoping to give effective help.