以工程实例为基础，对使用外部定时器时给P LC系统带来的时间竞争问题进行分析，并提出解决措施。

Based on instances, the paper analyses the time conflict of PLC system caused by exterior timer, and provides the solution to the problem.

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在分析现有供应链计划模式不足的基础上，为实现基于时间竞争的目的，提出了基于预订单思想的计划模式。

Based on analysis of the insufficient plan modes which are widely used now, a new plan mode, Predict-order mode in supply chain was proposed for Time Competition.

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