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When speaking about industrial networks with cyclic transactions of data exchange, one should take into consideration the FIP network and the master-slave access network characterised by a determined medium access time that enables the construction of a scenario of cyclic data exchanges in a selected user station. The network data exchange protocols supports the realization of data exchanges that can be forced either by master unit (master-slave access networks) or by any user, as it is the case of FIP networks. To build an efficient communication system, it is necessary to determine a number of factors such as the number of cyclic exchanges, time realization of cyclic exchanges, number of message transactions, and the number of aperiodic exchanges. This paper explains how to improve and optimise the cycle of exchanges.