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。
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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