Journal ArticleDOI
A Distributed Instrument for Performance Analysis of Real-Time Ethernet Networks
Reads0
Chats0
TLDR
A new low-cost distributed measurement instrument to measure timing characteristics of RTE nodes (end-to-end delays, synchronization, etc.) that has multiple FPGA-based probes that allow for simultaneous/synchronized logging on different place of the target RTE network.Abstract:
Ethernet technology is widely used in real-time industrial automation. Thanks to real-time Ethernet (RTE) protocols, defined in IEC61784-2 standard, new top-performance automation solutions can be created. Such systems may have communication cycle time down to tens of mus and cycle jitter less than 1 mus, making network testing and debugging very critical. Existing network and protocol analyzers can perform detailed local analysis, but characterization of high-performance RTE systems requires measurement of transmission delays and these instruments cannot be adequately synchronized among them to realize a distributed measurement network. This paper introduces a new low-cost distributed measurement instrument to measure timing characteristics of RTE nodes (end-to-end delays, synchronization, etc.). The proposed instrument has multiple FPGA-based probes that allow for simultaneous/synchronized logging on different place of the target RTE network. A PC-based "monitor station" stores all the data, ready for further elaboration. Architecture details are discussed, a prototype has been realized, and some experimental results are presented. For instance, synchronization accuracy between probes is below 100 ns.read more
Citations
More filters
Journal ArticleDOI
FPGAs in Industrial Control Applications
TL;DR: The aim of this paper is to review the state-of-the-art of Field Programmable Gate Array (FPGA) technologies and their contribution to industrial control applications and two short case studies of Neural Network control systems designs targeting FPGAs are presented.
Journal ArticleDOI
Wired and wireless sensor networks for industrial applications
TL;DR: An overview of the state-of-art of real-time sensor networks for industrial applications is presented and particular attention has been paid to the description of methods and instrumentation for performance measurement in this kind of architectures.
Journal ArticleDOI
Evaluation of EtherCAT Distributed Clock Performance
TL;DR: The performance of the DC mechanism is evaluated by means of a thorough campaign of experimental measurements carried out on a real network setup, and a number of factors have been taken into account that can affect accuracy and precision.
Journal ArticleDOI
On the Use of IEEE 1588 in Existing IEC 61850-Based SASs: Current Behavior and Future Challenges
TL;DR: This paper analyses the challenges for the next SAS generation that has to combine on the same plants the high accuracy IEEE 1588 implementation with high-availability protocols based on IEC 62439.
Journal ArticleDOI
Performance of a Real-Time EtherCAT Master Under Linux
TL;DR: In this paper, an open-source EtherCAT master supported by a popular real-time extension for Linux, the RT Patch, is thoroughly evaluated with long-term measurements, which build confidence on the suitability of the proposed approach for real-world applications.
References
More filters
Proceedings ArticleDOI
Low-latency hard real-time communication over switched Ethernet
J. Loeser,H. Haertig +1 more
TL;DR: This paper makes thorough experiments to understand the cost and practical limits of using fast and gigabit Ethernet for hard real-time communication, and does measurements to analyze properties of switches and delays that can be achieved using these switches.
Proceedings ArticleDOI
Enhancements to the time synchronization standard IEEE-1588 for a system of cascaded bridges
TL;DR: In this paper, a bypass clock instead of the boundary clock is proposed as an enhancement of the IEEE-1588 standard for bridged networks, where the local clock adjustment can be modeled by a corresponding control loop.
Journal ArticleDOI
Timeliness of real-time IP communication in switched industrial Ethernet networks
TL;DR: In this paper, substation automation (power distribution) is used as an example of a demanding automation system and a priority-based protocol stack is assessed, showing that real-time, Ethernet-based IP communication is now adequate even for demanding automated applications.
Journal ArticleDOI
Performance analysis of PROFINET networks
TL;DR: This paper focuses on the protocols used by PROFINET, an emerging standard for industrial communications based on Ethernet, which is now available in two different versions, named CBA and IO.
Proceedings ArticleDOI
Standardization of industrial Ethernet - the next battlefield?
Max Felser,Thilo Sauter +1 more
TL;DR: An overview of the various Ethernet-related activities in IEC TC65, specifically cabling, real-time, safety, and security issues, reviews the candidates for standardization and tries to investigate the chances of a new fieldbus war.