【摘要】 在面向对象的Ｐｅｔｒｉ网基础上，引入依赖消息，提出了一种扩充的面向对象Ｐｅｔｒｉ网（ＥＯＰＮ）模型，并以企业中的一项生产活动——ＰＣＢ元件贴装为实例，建立了描述这一活动系统的完整的ＥＯＰＮ模型，据此实现了物料分配的优化调度，构成了ＣＡＤ／ＣＡＭ集成系统中重要的一环更多还原

【Abstract】 By the introduction of dependence information, a model for the expanded object oriented Petri net (EOPN) is developed on the basis of OPN. With the job of SMT of PCB in an enterprise as an example, a complete EOPN model for describing such a job system is developed. An optimal scheduling system for material distribution is accomplished, which forms an important part in CAD/CAM integrated systems.更多还原