数控同步现场总线与CAN总线网关的设计

Design a Gateway Linking Numerical Control Synchronous Fieldbus with CAN Bus

众多总线标准的并存与不兼容制约了现场总线的发展与应用,使得各现场总线之间的互联成为当务之急。参考开放式数控系统中有关现场总线的规范,设计了数控同步现场总线与CAN总线的通信网关,其主要包含数控同步现场总线模块、CAN总线模块和数据帧封装转换模块三部分。在对这两种现场总线深入研究的基础上,设计了带优先级的CAN数据帧的缓冲队列,提出了数控同步现场总线应用层封装CAN数据帧的方法,保障了数控同步现场总线与CAN总线之间速率和周期的协调。

The coexistence and incompatibility of many fieldbus standards restricts the development and application of fieldbus,so the connectivity of buses becomes more and more important.Reference to specifications of fieldbuses on Open Numerical Control system,a gateway linking NCSF with CAN bus is designed,which mainly consists of three parts,NCSF module,CAN bus module,the module of packaging and conversing data frames.On the basis of deep study of NCSF and CAN bus,a priority queue of CAN data frames is designed,how to package CAN data frames on NCSF application layer is proposed,the coordination of cycle and rate between NCSF and CAN bus is provided.