In the actual work of the electrical industry, the addition of PLC technology to its development has played a great role in promoting the improvement of the perfect electrical system at the same time more improve the quality of the work of the electrical control, the future development of the electrical industry has a significant impact. The following is my compilation of electrical control and plc technology paper, I hope you can get a sense of it!
Electrical control and plc technology paper aElectrical control and PLC technology research
In today's high-tech level of drive, all the technical equipment is constantly upgrading, the requirements of the electrical control system has become increasingly high. In the actual work of the electrical industry, the addition of PLC technology has played a great role in promoting its development, improving the electrical system while improving the quality of electrical control work, which has a significant impact on the future development of the electrical industry.
Keywords electrical control PLC technology analysis
PLC from the appearance, has a small volume of lightweight features, small PLC bottom size is generally no more than 100mm, the quality of no more than 150g, so in the installation of convenient and easy assembly of the electrical system. Ability to use more widely in the digital control. In addition, the application of anti-interference technology makes the safety and reliability of the electrical control system operation provide a strong guarantee. the PLC external detection system set up for its own internal and external fault detection system provides a good condition. Moreover, the installation and operation of PLC is simple and easy to understand, and it is relatively easy to master for those who are engaged in electrical control. Storage logic is used in the practical application of PLC technology, wiring is relatively simple, so that it is also convenient for future maintenance and renovation, in reducing the workload while improving work efficiency.
1 PLC technology and electrical control after the integration of the workflow
Electrical control is mainly through the primary and secondary circuit control of electrical equipment to ensure the normal operation of the equipment, which has become an indispensable and important role in modern industrial automation, but also to promote the development of industrial automation is an important weapon. The essence of PLC technology is a controller, specialized in professional control, mainly using computers, communication technology, automation and other technologies developed communication controller. PLC technology and electrical control technology integration can generate a strong anti-interference ability and self-diagnostic capabilities, improve the electrical control system at the same time, effectively eliminating the fault in the system.
At present, the application of PLC technology in the electrical control industry is very wide, many companies began to gradually pay attention to the introduction of these foreign technologies, as a modern electrical control industry, the important role of PLC technology will be used to a large extent to promote the development of the electrical control industry. At the same time, want to PLC technology and electrical control reasonable integration must have a certain mastery and understanding of PLC technology, which is the PLC technology can be better utilized in the actual prerequisites and important foundation. In addition, PLC technology in the industrial system also has a wide range of applications, such as petroleum, building materials, iron and steel, chemical, electric power, machinery manufacturing, automotive, transportation and so on.
Combined with the workflow of PLC, according to the actual work experience, the workflow after the integration of PLC technology and electrical control is divided into three stages. The main ones are collecting and inputting raw data, user program execution, and refreshing output.
(1) Take the collection of data is the first step in the PLC work process. By scanning the way to read and store the input status points and data in turn, and at the same time stored in the I / O image area of the corresponding unit. Once this is done, the user program execution and the refreshing phase of the outputs are entered. During this phase, the state and data of the corresponding cells in the I/O image area do not change.
(2) On the basis of the completion of the first step, the user program is scanned in order from top to bottom. The user program is the execution phase, and in the specific implementation, the control line to the left of the user program is scanned first, while still adhering to the top-to-bottom and left-to-right order of the control line consisting of contacts for logical operations. Similarly, the state and data in the cells in the I/O image area do not change, but the state and data of other output points and soft devices in the I/O image cell area or the system RAM storage area may change.
(3) The final stage of the PLC workflow, the output refresh stage. At the end of the user program scan, the PLC enters the output refresh phase. In this phase, the CPU in accordance with the corresponding state of the I / O image area and data refresh all the output latch circuits and then by the output circuit to complete the corresponding device drive settings is the final output of the PLC process.
The workflow of the PLC is similar to most other mechanical devices, is a cyclic process. These three phases of work are cyclic operation, every three phases for a cycle. the integration of PLC technology and electrical control technology to improve the efficiency of work at the same time and save the failure and development of research expenses.
2 PLC technology in the application of electrical control common problems
System control failure. May be due to the aging of the line, the surrounding environment damage and other reasons caused by the control of the failure, and then can not pass the signal to the internal system, can not be completed on the reception of data, loading and conversion, while the system issued by the other executive command is also no way to receive.
Data collection and transmission failures can also be due to switching devices such as operation is not in place, such as opening, closing incomplete, resulting in the inability to receive or receive the wrong information, resulting in errors in the control operation, the system can not run normally, that is, resulting in the PLC can not receive the signal control system failure.
Equipment switches and field transmitters of their own failure is also so that the PLC technology can not work properly, triggered by the cause of the failure may be poor wiring contact, breakage, etc., the same will cause the above PLC control and analysis system can not receive data and further processing. In addition, human error is also one of the causes of system failure.
3 PLC technical problems corresponding to the solution
The reliability of the input PLC control system signal to strengthen attention. Ensure that all the field equipment and related components of the performance is intact, to eliminate the equipment itself due to parts and components of the problem caused by the signal can not be properly transmitted and received phenomenon. In addition, update and improve the main interface function module settings are also conducive to reducing control errors.
Improve the system settings to make it more reliable, automation, network integration. In the PLC electrical control system suffered damage or error, play the role of early warning system alarm, this function is very important in the PLC system control, can effectively monitor the work situation, reduce the loss of the system due to errors in the instructions. Ensure that the operating environment around the PLC, timely elimination of interfering factors, the implementation of 24-hour monitoring.
Strengthen the technical training of personnel, improve business capacity and quality of their own cultivation, encourage employees to learn new technologies, new methods and techniques to improve the quality of work.
4 Summary
In the face of today's rapid development of high-tech situation, in any field if you want to healthy long-term development, you must continue to learn to master the new technology, only to do a good job on the new technology and equipment to fully understand and learn and rationally apply it, it will be really rewarding. PLC in the electrical control plays a huge role in promoting the fusion of the two will be largely promote the progress of the electrical control industry to a large extent. To a large extent to promote the progress and development of the electrical control industry.
References
[1] Niu Yun. Advanced aircraft electrical system computer control and management system main processor key technology research [D]. Northwestern Polytechnical University, 2006.
[2]Chen Shi. Research on electrical control technology of single machine of MW-class wind power generation system--reactive power compensation and yaw control system [D]. Nanjing University of Aeronautics and Astronautics, 2004.
[3]Zhou Shiqiang, Guo Qiang, Zhu Tao, Liu Xudong. Analysis and research on electrical control and PLC application technology [J]. Zhonghua Minzhu (Lower Decade), 2014, 01: 199.
[4]Fu Huansen, Li Yuangui. Project-driven teaching and research based on the cultivation of engineering applied talents--Taking the project course of electrical control and PLC technology as an example[J]. Popular Science and Technology, 2012.
Author Introduction
Zhang Che (1981-), male, Zhangjiagang City, Jiangsu Province. Undergraduate degree. Intermediate engineer. Research direction is electrical automation control.
Author Unit
Zhangjiagang Shagang Group Zhangjiagang City, Jiangsu Province 215600
Electrical control and plc technology thesis twoElectrical control and PLC technology application
Abstract: For the traditional CNC lathe in the automation of the control function of the weakness of the CK6140 ordinary CNC lathe as the object, a detailed discussion of the CNC lathe Electrical control, based on PLC to achieve the automation of CNC lathe transformation function, gives a detailed electrification, automation transformation of the program and control structure, for further improving the application of PLC automation control technology in the field of electrical control has a good reference significance.
Keywords: electrical control; PLC technology; automation; unattended
1 Introduction
With the gradual development of Programmable Logic Controller (PLC) technology, a lot of industrial production requirements to achieve the function of automation control, are used to build an automation control system using PLC, especially for some of the electrical control of the more complicated electrical equipment and large-scale Electromechanical equipment, PLC has unique advantages in electrification and automation control, such as sequential control, high reliability, good stability, easy to build network and remote control, as well as unattended and many other advantages. Based on this, PLC technology has gradually become the main application technology of industrial electrical automation control.
This thesis is mainly combined with the transformation of the electrification function of CNC machine tools, detailed discussion of CNC machine tools electrification transformation process based on the application of PLC technology, as well as PLC technology in the realization of the automation control function of CNC machine tools, in order to share with the majority of counterparts.
2 Overview of the electrification of CNC machine tools
2.1 The main functions of CNC machine tools
CNC machine tools are the most widely used class of electromechanical equipment for machining, manufacturing and production. CNC machine tools rely on CNC programs to achieve automatic cutting and processing of parts. However, at present, there are still more than nearly 10 million CNC machine tools in China, mainly relying on manual control to complete cutting and processing, unable to realize the basic electrification and automation control. For this reason, the main purpose of this thesis is to realize the electrification of CNC machine tools based on PLC control technology, mainly to realize the following functions:
(1) All motors, contactors, etc. of the CNC machine tools to realize PLC-based automation control;
(2) The feed movement of the CNC machine tools is automatically completed by the PLC control, without manual intervention;
( 3) Automatically detect the relevant parameters in the cutting process of parts, such as processing parameters, state parameters and so on;
(4) Combined with the host computer can realize the remote control of the CNC machine tool to achieve the purpose of unattended.
2.2 Overall scheme of electrification transformation
Combined with the above functional requirements for the electrification and automation transformation of CNC lathes, the automation transformation scheme combining the upper computer and the lower computer is determined. The overall structure of the program is analyzed as follows:
(1) The upper computer with the help of the industrial computer, the use of industrial computer powerful image processing capabilities, focusing on completing the production of CNC lathe configuration screen display, as well as the necessary transmission of production data, save, output, but also to be able to realize the relevant control commands, to ensure that the CNC lathe can automatically complete all the cutting and processing of production tasks.
( 2) The lower computer adopts the electrical control mode based on PLC technology, which is responsible for collecting the production data, environmental data, status data and other parameters of the CNC lathe by the sensor and data acquisition board, and the PLC realizes the calculation of the relevant data and transmits them to the upper computer for the graphical display and preservation of the relevant data; on the other hand, the PLC control system receives control instructions from the upper computer to realize the control of the CNC lathe and to realize the control of the CNC lathe. On the other hand, the PLC control system also receives the control instructions from the host computer to realize the remote control of the CNC lathe.
(3) For the most critical control of CNC lathe - feed movement control, using PLC + motion control board mode to achieve electrification and automation control. Specific realization is: choose the appropriate motion control board, with PLC sequence control, the feed axis motor to achieve servo motion control, so as to realize the automation of CNC lathe feed movement control.
3 CNC lathe electrification automatic control transformation realization
3.1 System transformation structure design
CNC lathe electrification automatic control transformation, its overall structure is shown in Figure 1 below, and its overall structure is mainly composed of the following parts:
3.1.1 Bottom equipment
Bottom equipment mainly includes two aspects. First of all, the realization of CNC lathe automatic cutting and processing operation and other basic functions of the necessary electrical and electromechanical equipment, such as power modules, motor modules, etc., these electromechanical equipment to ensure that the basic functions of CNC lathe stable and reliable realization; Secondly, the bottom equipment also includes various types of sensors, such as monitoring the speed of motor speed, temperature speed sensors and temperature sensors, monitoring the feed axis movement feed amount of the scale, etc., these sensing and data acquisition type of equipment, the bottom equipment is mainly composed of two aspects. These sensing and data acquisition equipment for the realization of CNC lathe automation control provides a basic data source.
3.1.2 Local PLC station
The local PLC station is mainly responsible for receiving the sensing parameters, state parameters and other detection parameters transmitted by the underlying sensing devices, and judging the working status of the whole CNC lathe through the internal program operation, and uploading the key parameters to the remote control terminal for graphical display, storage, output printing and other operations. On the other hand, the local PLC station also receives control commands from the remote control terminal, such as stop, start and other control commands, the PLC station through the control of the corresponding actuators (such as motors), so as to realize the function of automation control.
3.1.3 Remote Control Terminal
The remote control terminal mainly relies on the upper computer data management and status monitoring realized by the industrial control computer, and needs to specially develop a set of software programs for the processing, production and automatic control of CNC lathes, in order to realize remote, networked and automated control of CNC lathes, and to truly realize the function of unattended operation.
3.2 PLC electrical control system design and implementation
This research paper takes CK6140 general quantity machine tool as the specific research object, and discusses in detail the transformation of its electrification and automation control. Through the above analysis of the machine tool transformation program and structure and function, it can be determined that the entire machine tool electrification, automation transformation, a **** need to achieve 14 system inputs, 9 system outputs. Combined with the control requirements, here the selection of Japan's Mitsubishi Corporation's FX2N-48MR PLC, the input loop using 24V DC power supply mode. According to the analysis of the control function of each module of the CNC machine tool, the selection of suitable contactors, relays, switches, auxiliary contacts and other electrical control components, and PLC *** with the realization of the control of electrical equipment, such as PLC through the contactor control motor module, PLC through the relay control solenoid valves and other components, so as to complete the transformation of the electrification of the CNC lathe based on PLC control.
4 Conclusion
With the increasing complexity of electrical equipment, industrial production for the requirements of electrical control is also higher and higher, based on the PLC automation control technology has been widely used, and has gradually become one of the mainstream technologies in the current industrial automation production control. The biggest advantage of using PLC technology is to realize automation control at the same time has a high degree of reliability and anti-interference ability, greatly avoided due to the use of microcontroller technology caused by the phenomenon of system instability. This thesis combines the electrical control to discuss in detail the application of PLC automation technology, gives a specific system design examples, for further improving the industrialization of PLC automation technology has a good guidance and reference significance.
References.