| Field bus has the advantages of simple protocol, strong fault-tolerant, low cost.Field-bus based CNC system has become the future development trend of CNC system.Now, the blue sky CNC system has support MECHATROLINK-Ⅲ (hereinafter referredto as M-Ⅲ) and SSB-Ⅲ communication protocol. In order to test the communicationreliability of existing bus-based CNC system and measure the bus transfer data inreal-time and accuracy and provide the basic for the system's reliable operation, weneed to develop a bus testing system oriented research and production. The maincontent of this paper is as follows.First of all, this paper introduces development of the bus-based CNC system, theapplication of field bus in CNC system, the M-Ⅲ bus technology and SSB-Ⅲ bustechnology. Then this paper gives the whole structure and working principle of bustesting system, and presents its design proposal.Secondly, on the ground of studying the three-layer architecture ofMECHATROLINK-Ⅲ bus, this paper designs and realizes test card based on M-Ⅲ bus.In this section, we analysis the functions of the test card, and then complete theinterconnection of physical layer and data link layer to realize the communicationbetween master station and slave station. We design the SOPC system in the FPGA anddeal with M-Ⅲ drivers and application layer protocol software in the NIOS processor.Thirdly, this paper design and implement the test card based on SSB-Ⅲ bus.According to the functions of test card, we need to realize the function of data link layerand complete the physical layer and link layer connection in the hardware, and also weneed to complete SSB-Ⅲ driver and application layer in the software.Finally, in order to visually display the motion state of slave station (speed andposition information and so on) and determine the information of the commandexecution results, and then test the correctness of the bus communication,human-computer interface is designed in this paper which use QT technology. |
PDF Full Text Request