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Study on the High Speed Digital Communication System Based on SERCOS

Author: QuanNingHui
Tutor: GaoJunLi
School: Guangdong University of Technology
Course: Control Theory and Control Engineering
Keywords: CNC system Fieldbus Design Patterns SERCOS UML
CLC: TP273
Type: Master's thesis
Year: 2011
Downloads: 30
Quote: 0
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Abstract


For high real-time, high-performance requirements of an open control system, one of the key core technology is a high-speed communication between the numerical control (CNC) system and servo drive. The purpose of this topic the SERCOS-Ⅱ bus technology is introduced into the numerical control systems, design and development of the SERCOS-Ⅱ bus-based high-speed main slave network communication module, and makes the numerical control system based on the structure through the master-slave network communication module The digital servo, sensor and PLC-IO real-time data exchange. First, based on the existing problems of the traditional control structures for next-generation communications interface requirements, the proposed the fieldbus technology into the CNC system of high-speed communication interface. Generally have strict synchronization requirements or multi-motor coordination movement needs for high-speed CNC system, combined with the the fieldbus investigation and research, to choose a the SERCOS-Ⅱ bus technology to build high-speed digital communication system commonly used in industrial control. Second, studies the SERCOS-Ⅱ bus protocol features and works, and to investigate the synchronization mechanism. Key technical analysis of the overall system structure, the design of the main station hardware circuit diagram, detailing the various functional modules and hardware schematic design. The key issues on the basis of the study of high-speed PCB design, consider the requirements of industrial environments on the reliability of the communication system, the introduction of the EMC (electromagnetic compatibility) design, to complete the design and development of high-reliability hardware circuit schematic and PCB design. In terms of software design, in order to overcome the limitations of the current development of embedded software static way, the introduction of UML and design patterns of thinking, build UML-based embedded visual modeling program. And from various stages of UML modeling, this paper proposes a universal selection method based on the embedded process design mode. On this basis, given the use of UML modeling of the whole process of the software architecture of the system, and details of one of the key technologies. In addition, the introduction of the technical details SDS9-6CNCH, master and slave drivers developed to determine the program to explore the the parameters calculated SERCON816 initialization and periodically transmit critical period. Finally, the design of system conformance testing program, based on the three-axis CNC the system SDS9-6CNCH SERCOS master network communication module system testing. The test results show that: the independent development of the subject the SERCOS network communication module, in line with the rules on SERCOS-Ⅱ agreement. Support of 6-axis servo system 0.5ms interpolation cycle synchronous operation specified position command control performance.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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