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CAN 技术规范包括 A、B 两部分。CAN 2.0A 定义了 CAN 标准格式,CAN 2.0B给出了标准的和扩展的两种格式。在 CAN 2.0A 的基础上,CAN 2.0B 支持的扩展格式,数据块的标识码从11位扩至29位,接收滤波允许“双滤”功能。应用 CAN 2.0B 协议使每一帧报文都包含目标地址和源地址信息,配合 SJA 1000芯片的接收双滤功能,可以实现点对点之间的信息交互,不影响其它节点。本文提出了在变电站综合自动化系统中,采用 CAN 2.0B 协议实现带各间隔层保护测控单元的信息共享,降低装置成本和硬件复杂程度的一种新方法。
CAN technical specifications include A, B two parts. CAN 2.0A defines the CAN standard format, CAN 2.0B gives both standard and extended formats. Based on CAN 2.0A, the extended format supported by CAN 2.0B expands the ID number of the data block from 11 bits to 29 bits. The receive filter allows the “double filter” function. Application of CAN 2.0B protocol so that each frame contains the packet destination address and source address information, with the SJA 1000 chip to receive double-filter function, you can achieve point-to-point information exchange, does not affect other nodes. This paper presents a new method to realize the information sharing with the protection and control unit with each bay layer and reduce the device cost and hardware complexity by using CAN 2.0B protocol in substation integrated automation system.