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Research of the Higher Layer Protocol CANopen and Its Implementation on the Modularized CAN Bus Controller

Author: SongXiaoQiang
Tutor: WuAiGuo
School: Tianjin University
Course: Control Theory and Control Engineering
Keywords: Fieldbus CAN bus CAN bus controller CANopen application layer protocol
CLC: TP273.5
Type: Master's thesis
Year: 2004
Downloads: 1032
Quote: 9
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Abstract


Universal effective , reliable and economic platform , CAN bus has widely been welcomed . It can be used in almost any type of data communication in automotive systems , machinery, equipment and industrial automation . However , CAN chip only provides the OSI Reference Model (OSI) physical layer and link layer functions , general user must directly link layer driver operation can not directly meet the needs of industrial control network configuration and product interoperability even requirements. Must develop appropriate to CAN chip based on a complete industrial control fieldbus systems , application-layer protocol , system configuration , equipment interconnection and compatible functions . For this purpose, established in Germany Automation CAN users and to develop supplier associations \CANopen protocol has been submitted to the European Standards Committee for discussion , as a new industrial fieldbus standard . The detailed analysis of the CANopen application layer ( CiA DS -301 ) . Explain the CANopen core - object dictionary , all kinds of communication object identifier assignment , as well as some of the equipment sub-protocol (Device Profiles ) . In addition , independent development and design of the modular CAN bus controller with strong versatility . Two bus structure of the CAN bus controller , the system bus and I / O bus separation , will be divided into a CAN node control module and the I / O module two independent parts , data communications through 485 . The user may need a flexible combination of I / O modules to the formation of I / O ports to form a complete CAN node , its structural flexibility , versatility, each CAN node with the I / O ports increased , making the the CAN node relative reduction system real-time nature of the system is greatly enhanced. Finally, the CANopen protocol on the the modular CAN bus controller node communications and network management functions . And improvements have been made to explore further on the real-time scheduling of the CAN bus data .

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