铁路信号用现场总线的基本研究

A Basic Study of Fieldbuses Used for Railway Signalling Control

铁路信号用现场总线的基本要求有两个：（１）支持高可靠性；（２）支持冗余和容错。本文围绕上述两个要求叙述了选择铁路信号用现场总线时应注意的几个方面；引入了铁路信号用现场总线的准故障安全概念；详细地描述了现场总线为支撑控制端机故障安全性所应采取的协议结构。

A fieldbus used for railway signalling control must (1)support high reliability and(2)support redundancy and fault tolerance required by railway signalling devices. Based on the above two principles, the paper elaborates on several facets related to selecting fieldbuses used for railway signalling control.The paper also defines the concept of quasi fail safety, describes the protocol structure which must be adopted and the requirements and constraints which must be satisfied by a fieldbus for supporting the fail safety of railway signalling control.