NC machine tool network control system on the basis of industrial Ethernet
The numerical control equipment that will make the workshop links with computer and forms DNC( DistributedNumericalContro1) The system, have already become and realized integrating and one of the integrated urgent key technology to be solved of computer-aided production management CAD/ CAM. And the realization of communication network is to construct the most key technology of the integrated DNC system, it generally includes two levels, the upper strata are the communication of the server among DNC host computer and CAD/ CAM/ CAPP, MRPII systematic coin Pi, the lower floor is guided by a lot methods that DNC host computer links with communication NC machine tools of different numerical control equipment of the workshop, such as serial communication method mouth, MAP communication, field bus, Ethernet,etc.. Though these communication methods have realized the networking of the NC machine tool to a certain extent, but they exist more or less some is insufficient in employing. In order to improve the can be integratedding that the NC machine tool networks the control system and meet the real-time scheduling function, I have proposed the NC machine tool based on industrial Ethernet and networked the control system.
A system architecture
The systematic structure is selected on the basis of actual need mainly, the factor needing considering mainly has environment, automaticity and managerial information integration of factory of the workshop,etc.. The system adopts industrial Ethernet as the network platform, designs guaranteeing the communication noncongestion and real-time nature under the environment of the workshop abominable and of low quality in anti-interference of industrial Ethernet, and easy to integrate with administration and supervision authorities. The system adopts the bus line + star topological structure. The backbone adopts the bus structure, it is apt to make up the redundancy loop network. The part adopts the star structure, has prevented the trouble of a certain apparatus from influencing other apparatuses. If systematic topological structure such as Fig. 1 shows.
The protocol converter essence of realizing NC machine tool and industrial Ethernet connection is the converters of industrial Ethernet data packets and RS232 data packets. It meets people industrial Ethernet up, adopts the technical grade RJ45 interface form, connect the NC machine tool with RS232 serial port downward. The protocol converter can be installed on lathe as a part of the NC machine tool. [1][2][3]
Tags: communication, Ethernet, host computer, MAP, NC machine tool
