Synchronisation of a multi-motor speed control system

Purpose - The purpose of this research is to compare an industrial ethernet based network (PROFINET Class 1) with a traditional fieldbus network (PROFIBUS). Design/methodology/approach - Two sets of identical motors were used in the experimental set-up. The speed synchronisation of a lead and follower motors was compared using both PROFINET Class 1 and a PROFIBUS DP network. The level of synchronising achievable was used as a measure of performance for each network. Findings - It was found that PROFIBUS DP produces a better performance for set point and load changes than PROFINET Class 1 network. Research limitations/implications - PROFINET Class 2 and higher could not be used in the experiment due to availability of equipment and funding. Practical implications - This research provides a comparative study of two very popular industrial networks. The results can be used as reference by industry for selection of industrial networks. Originality/value - The paper provides a manufacturer independent practical comparison of two industrial networks. The application area of speed synchronisation is demanding, and should inform the user on the performance and limitation of industrial networks.