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本文介绍故障安全的现场总线（FSbus）协议设计中所考虑的一些基本问题，给出实现消息故障安全传输的一种FSbus:令牌双总线的硬连接主体结构．
This paper introduces some basic issues considered in the design of the fail-safe field bus (FSbus) protocol and presents a kind of FSbus which is used to realize the fail-safe transmission of messages: the structure of the hard-wired main body of the token dual bus.