铁路信号中的可编程电子系统（PES）是一种安全相关系统。 这类系统更注重失效-安全，而不仅仅是可靠性或可用性。
Programmable electronic system (PES) used in railway signaling is a safety related system, which lays more stress on the ability of fail safe, not merely on the reliability or availability.
该系统将可编程控制器用于铁路信号系统中并作为系统的核心控制器，取代了传统的电气集中控制方式，克服了其系统庞大，可靠性低的缺点。
This system USES PLC in railway signal system as the core controller and it replaces the additional electric centralized control mode, overcomes the disadvantages such as hugeness, low reliability.
针对铁路信号中常用的双机热备结构进行了可靠性和安全性分析。
This paper analyzes the reliability and safety of dual module hot spare architecture which is widely used in railway signalling system to achieve high reliability and safety.
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