Two types of special resources in Petri nets models of flexible manufacturing systems
柔性制造系统Petri网模型中的两类特殊资源*

This paper concerned two types of resources with special location in a class of flexible manufacturing systems(FMS) Petri nets models N named S3PR. These two types of resources were defined as the first type and the second type of special location resources,respectively.It was proved that neither these resources would be contained in each arbitrary strict minimal siphon(SMS) or elementary siphon of S3PR,nor those operation places that used these resources.The conclusion illustrates that there might be some resources which have nothing to do with the occurrence of system deadlock. Finally,briefly introduced the application perspective of the two types of special resources.