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.
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.
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。
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