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The automation architecture consists of actuators, sensors, programmable logic controllers (PLC) and monitoring systems. Some research focuses on how to replace the communication between those entities from wired to wireless communication taking in consideration the industrial constraints, given the advantages of this kind of communication. To study the performance of the wireless network system, this paper presents an approach for estimating the maximum and minimum delays for each traffic of a wireless network in the worst case. Influence of the maximum number of retransmission parameter is studied on the estimated delay and on the packet loss rate. Our results are compared and analyzed with simulated ones obtained with the tool OPNET.