CAN总线在低压变电站通信系统中的应用

文章介绍了CAN总线在变电站综合自动化系统中的应用模式，以及作者设计的一套基于CAN总线通信的低压综合保护测控装置。本装置中的保护插件采用了双CPU结构，其中监控CPU采用了PHILIPS公司生产的内嵌有C-AN控制器的微处理器芯片P51XA—C3，再配以适当的接口器件，本装置可以方便地与采用CAN总线技术的监控网连接。软件上，基于CAN总线通信的部分，采用了P51XA的汇编语言编程，简单高效。文章最后具体绘出了保护插件上P51XA—C3中内嵌CAN控制器应用的硬件接口图和软件设计。

The Application of CAN Field Bus in the Substation Communication System

The pattern of CAN network applied to substation integrated automation system is given and an integrated digital protection device based on CAN field bus which is designed by the author is introduced,too. The protection board in the device adopts double CPUs,of which the monitoring CPU is the microprocessor P51XA-C3 with the build-in CAN controller produced by PHILIPS, so the device can join the monitoring network of CAN field bus with necessary interfaces easily. The software for CAN communication in the device is designed in P51XA assembly language,and it's easy and efficient. In the last part of this paper,the specific hardware and software design of the application of the CAN controller in microprocessor P51XA-C3 on the protection board is provided.