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The current Manufacturing Execution System (MES) has many weaknesses, such as poor generality, weak reconfigurability
and difficult performance analysis. In order to solve these problems, a functional decomposition diagram
was designed based on the functional requirements of MES, and a general petri net model was also established. The complexity
and junction features of the model were analyzed based on Petri nets, and the network core layer and system reliability
were gotten after the model was transformed to the undirected network diagram. Finally, the best system scheme
for different selections was given based on the analysis of reliability.