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The paper presents a case study regarding a real PROFINET IO network for factory automation. The aim of the study is the evaluation of the time related parameter of a real network. A large factory automation plant has been chosen as testbed since PROFINET IO RT Class 1 and 2 (unsynchronized) are mainly used in those applications. The analyzed network has a high number of distributed IO, actuators and sensors; its topology is complex (star and ring); and it is fully operative (in-production). The considered implementation stresses the PROFINET IO communication as no laboratory setup can do, giving meaningful information about real operative conditions on short-term. The results of this case study can be used both to improve simulation models of devices and to verify critical situations in real plants.