Existing design methods for discrete event control system (DECS) implemented with programmable logical controller (PLC) have disadvantages in efficiency and ease of use.

对于采用可编程逻辑控制器(PLC)实现的复杂离散事件控制系统(DECS)，现有设计方法在效率和易用性等方面存在不足。

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The state evolution of low-level controlled plant conduces to event occurrence, whenever high-level discrete event system controller issues corresponding control commands and makes decision.

下层受控对象的状态演化导致事件的发生，并由上层的离散事件系统控制器做出监督决策，发出相应的控制命令。

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Discrete event systems are one of the frontiers of research in the control system theory and a new branch in the field, to which increasing attention has been paid.

离散事件系统作为系统与控制理论的一个新兴分支和前沿方向，其研究日益受到人们的重视。

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