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子实时系统往往存在于某些工业环境中,如集散控制DCS(distributed control system)、现场总线控制系统FCS(Fieldbus Control System)以及工业以太网EPA(Ethernet for Plant Automation)就是典型代表。但是,这些例证多有自己特定的网络结构和模式,关于实时网络更一般的结构和特征仍需研究。本文则主要就交换式实时网络,讨论并证明了实时任务起点不一致时的准入条件,并就网络中多任务集的调度提出一个基于缓冲的调度方案。
Sub-real-time systems are often found in some industrial environments, such as Distributed Control System (DCS), Fieldbus Control System (FCS) and Ethernet for Plant Automation (EPA). However, these examples have their own specific network structure and mode, and more general structure and characteristics of real-time network still need to be studied. In this paper, the exchange real-time network is mainly discussed and proven when the starting point of real-time tasks inconsistent access conditions, and the scheduling of multi-task set in the network to propose a buffer-based scheduling scheme.