Research on Remote Control of CNC System Based on WEB

Zhao Weijun, Yi Hong, Ni Zhonghua, Cao Jie (Department of Mechanical Engineering, Southeast University, Nanjing 210096) and the advantages of WEB technology, made a meaningful exploration of the remote control of CNC system through WEB, and analyzed the used Key technology.

Open CNC; Remote Control: TC659: A 0 With the development of computer, communication and network technology, the manufacturing system is also developing towards integration, network and globalization. Making full use of off-site resources, equipment, knowledge, etc. to respond quickly to market demands, and producing products that meet the needs of users has become an inevitable trend and basic requirement for the development of the manufacturing industry. As the basic equipment for manufacturing system automation, CNC machine tools are remotely controlled by operation, monitoring and fault diagnosis through network connection, which is of great significance for the concrete implementation of networked manufacturing. CNC system is the core part of CNC machine tools. The development of open CNC system provides the possibility for CNC machine tool to realize production management, process design, equipment scheduling and network control.

Based on the research of several methods of remote control of numerical control system, this paper proposes a remote control of numerical control system by WEB technology through the use of WEB technology based on the characteristics of open CNC system based on PC and the advantages of WEB application. The solution lays the foundation for remote network manufacturing and comprehensive automation of enterprises.

1 The method of remote control of CNC system can be used. The communication mode between computer and CNC machining equipment depends on the communication interface and communication protocol of CNC system. The communication interfaces provided by the numerical control system mainly include: asynchronous serial communication interface, DNC interface, field bus interface, MAP interface, Ethernet interface, and the like. Therefore, there are mainly the following solutions for remote control of the numerical control system.

The serial ports commonly used in L1 serial port numerical control systems mainly include RS 232, RS422, RS485 and so on. It is more convenient to use serial port communication, and it is easier to implement, but the communication distance is relatively close.

Fund Project: Jiangsu Science and Technology Research Project--, male, Benxi, Liaoning, Ph.D., Department of Mechanical Engineering, Southeast University, research direction is CAD/CAM, CNC technology.

The interface can realize communication over a long distance, with error feedback and online real-time modification function, which is convenient for remote management, but the structure is complicated and communication software development is difficult.

L3 adopts IVPP network or fieldbus interface to adopt network interface. The communication speed is fast and the reliability is high, which can realize some real-time control requirements.

For the numerical control system providing the above interface, if it is to be remotely controlled through the Internet, it can generally be connected to the remote control PC on the other end of the Internet through the control host located at the site. The remote PC controls the CNC system by controlling this field host as shown.

L4 adopts the TCP/IP protocol network interface. For the CNC system providing such interface, it can directly connect to the Internet and connect with remote computer remotely to realize end-to-end remote control.

Due to the lack of hardware resources of the traditional CNC system, to achieve end-to-end remote control on the Internet, it is necessary to write complex network procedures for the CNC system, which is too difficult for non-professional technicians unless the CNC system has been embedded inside. The hardware and network protocol modules necessary to implement Internet connectivity. The open CNC system based on PC can make full use of the hardware and software resources and networking advantages of the general PC. Therefore, the WEB-based remote CNC system solution proposed in this paper is based on the PC-based open CNC system that provides TCP/IP protocol network interface and DCS operating system.

2 WEB-based remote control options There are two main options for remote control on the WEB: browser/WEB server structure and client/server structure.

21 browser / WEB server structure Generally, most web browsers seen by the browser are static. The client sends a request to the server through the URL address, and then the server returns a previously stored WEB page to the client browser. . Later, the "general gateway interface", CGI, was developed, which is an application development program that resides on the server port. The addition of the CGI function enables the client to interact with the server in the It is the standard interface for the external service of the WEB server. CGI activates the corresponding process according to the HTTP request of the browser side. Similar to CGI, the system structure of ISAPI and NSAPI adopting this control method is as shown.

22 client / server structure remote control software exists in the form of "client / server", including a client program (downloadable through the WEB server and running on the browser side) and a server program (running on the controlled computer side, This article is a CNC system X. This structure can directly send specific request commands to the server by the client, or return information to the client by the server, without having to go through the WEB server, thus achieving end-to-end control, which can meet certain real-time control. Requirements, as shown.

Client software] Server-side software 圄3 Client/server structure control mode 圄3 System-implemented functions and key technologies used to implement the functions of this topic The goal of this topic is to build on the remote client browser. The operation of the CNC machine tool realizes the basic functions on the operation panel of the CNC system. Mainly include: control (such as machine start/stop, automatic machining, homing, coolant on/off, etc.), NC code upload/download, machining simulation, online feedback of machine running status, etc.

The key technology support adopted by Li 2 is an important factor for the rapid development of the Internet.

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