Improved architecture for Profinet IRT devices

This paper deals with Real-Time applications based on Profinet IO Real-Time Class 3. The industrial automation in some cases requires the precision of IO data timing well below the delivered cycle time on the bus. When using the Isochronous Real-Time protocol of Profinet, one single predefined time within a cycle time can be chosen for the inputs- and outputs. The work presented here, shows how the architecture of a Profinet device can be improved. The user can define the time of an input or output within the given time slot with an accuracy of 65 nanoseconds. Furthermore the feasibility of the proposed design is proven with several measurements and simulations.

[1]  Daniele Marioli,et al.  Evaluation of timing characteristics of a prototype system based on PROFINET IO RT_Class 3 , 2007, 2007 IEEE Conference on Emerging Technologies and Factory Automation (EFTA 2007).

[2]  Max Felser,et al.  Real-Time Ethernet - Industry Prospective , 2005, Proceedings of the IEEE.

[3]  Gianluca Cena,et al.  Evaluation of EtherCAT Distributed Clock Performance , 2012, IEEE Transactions on Industrial Informatics.

[4]  Daniele Marioli,et al.  Experimental analysis to estimate jitter in PROFINET IO Class 1 networks , 2006, 2006 IEEE Conference on Emerging Technologies and Factory Automation.

[5]  J. Jasperneite,et al.  A new approach for increasing the performance of the industrial Ethernet system PROFINET , 2008, 2008 IEEE International Workshop on Factory Communication Systems.

[6]  Max Felser.  Fieldbus based isochronous automation application , 2009, 2009 IEEE Conference on Emerging Technologies & Factory Automation.

[7]  Jean-Dominique Decotignie,et al.  Ethernet-Based Real-Time and Industrial Communications , 2005, Proceedings of the IEEE.

[8]  J. Jasperneite,et al.  Enhancements to the time synchronization standard IEEE-1588 for a system of cascaded bridges , 2004, IEEE International Workshop on Factory Communication Systems, 2004. Proceedings..