Estimation to the Time Parameters of PROFIBUS Network System

PROFIBUS luldbus is used widely in many automated systems such as manufacturing industries and process factories. In this paper, some of parameters are analyzed, which have close relationship with the real time performance of system, such as DP cycle time and target token rotation time. Two kinds of formulas of time estimate are given. The variety trend of DP cycle time is analyzed following transmission speed, the amount of data exchange, the number of slave stations etc. As a result, some useful suggestions are presented to improve the real time performance of PROFIBUS network system.