Research on Network Communication and Control Technology of Economic CNC Machine Tools
Abstract
With the rapid development of modern industry, the use of CNC machine tools has been more and more extensive. In order to satisfy the demand of machining accuracy and quantity in modern industrial production, machine tools equipped with numerical control system are used. In order to make the numerical control system more efficiently control the machine tool, it is necessary to carry out network communication to realize the remote control and monitoring. This article focuses on economic numerically controlled machine tools, and systematically studies the current main network communication and control technology used in economic numerical control machine tools.
1 Introduction
Modern manufacturing industry highly values the improvement of advanced production technology and equipment, and the use of numerical control has become the trend. As the application of numerically controlled machine tools has become more and more extensive, the requirements for network communication are higher. In modern factories, numerical control systems are required to complete their tasks through network communication with external equipment, including computers, PLCs and automatic programming systems. In order to achieve this goal, a variety of network communication technologies must be adopted. The development of network communication technology has made it possible for numerical control systems to realize remote monitoring and control, communication between numerical control systems, and a variety of information acquisition and processing.
2 Network Communication and Control Technology of Economic Numerically Controlled Machine Tools
2.1 Overview
Modern numerically controlled machine tools must use the advanced network control technology in order to ensure that the machine tool processing accuracy and quantity of industrial production. At present, economic numerical control machine tools mainly adopt IEC687 network communication, M17/176-LX digital differential line communication and Ethernet communication, etc.
2.2 IEC687 Networking Technology
IEC687, which is also called IEC871, is a bus-based distributed control system bus, which was originally developed by Intermat in Sweden in the early 1980s. In the early 1990s, this system was adopted and standardized by the International Electrotechnical Commission (IEC).
IEC687 adopts the master-slave structure of the network communication system. Within the network segment, each node can be added, deleted or changed. Different communication networks can be connected within the same network segment. The IEC687 network is divided into two levels: the physical layer, the data link layer and the application layer. In the physical layer, a transmission rate of 9600, 19200, 28800, 38400, 57600, 115200 and 230400bps can be used for communication.
2.3 M17/176-LX Digital Differential Line Communication
M17/176-LX is a digital differential line communication technology developed by Bosch and Siemens. This technology uses a special two-wire digital differential line as the medium of communication. It is widely used in environment with high electromagnetic interference. The length of the line bus can reach 2000m, and moreover, a maximum of 64 nodes can be connected on the same line.
The communication protocol used in M17/176-LX consists of two parts: the low-level communication protocol (LLCP), and the high-level communication protocol (HLCP). The LLCP implements the transmission, reception and addressing of data between the master and slave through a specific communication model. HLCP realizes multi-point communication, and provides an absolute address above the physical address as the data transfer address.
2.4 Ethernet Technology
Ethernet is one of the most widely used communication technologies. The communication protocol of Ethernet is divided into three layers: the physical layer, the data link layer, and the network layer. The physical layer is responsible for the physical connection, while the data link layer is responsible for the data transmission and reception of the data link. The network layer protocol is responsible for the routing of data packets and delivery. The protocol used in Ethernet is TCP/IP protocol. In addition, Ethernet also provides system services for unified access to different types of resource sharing. It can create multiple virtual local area networks for different departments for a unified networking system.
3 Conclusion
In summary, the application of network communication and control technology of economic numerical control machine tools is increasing. At present, the main network communication and control technologies used in economic numerical control machine tools are terminal ECC687 network communication, M17/176-LX digital differential line communication and Ethernet communication. These technologies ensure that economic numerical control machine tool can realize the remote supervision, quantification and remote control. In the future, with the development of science and technology, the application of economic numerical control machine tools in production will become more and more popular.
