The purpose of this paper is to present an approach for the performance analysis of manufacturing processes based on information gathering in a Factory Information System (FIS). It makes use of the overall equipment efficiency (OEE) index for measuring the efficiency of the process and used resources, such as machines. Information analysis in such a system must be carried out dynamically. With this in mind, colored Petri nets (CPN), which model the information flow for a FIS are used. The CPN models are built on a conceptual architecture of a FIS system, used to explore data integration and manipulation. The obtained models represent the necessary information flow for data acquisition from machines for performance indexes such as OEE to be calculated and stored in a conceptual architecture as described. The proposed model is yet to be implemented in a hardware module in order to test its effectiveness.