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The modern industrial and substation automation Ethernet networks have demanding requirements about high availability. Recently, the IEEE 802.1 WG proposes the IEEE 802.1aq, also known as Shortest Path Bridging, to manage Ethernet redundant networks. The IEEE 1588 protocol can exploit the SPB capabilities to manage multiple paths in order to improve synchronization availability. In the paper, the...
Clock synchronization is essential to support time-based medium access scheduling and distributed control over industrial networks relying on Real-Time Ethernet (RTE). PROFINET IO is one of the most widely used field-buses in large automation plants. The PROFINET IO Isochronous Real Time (IRT) implementation includes a Precision Transparent Clock Protocol (PTCP) for network-level synchronization....
Wireless communications in the industrial automation world still suffer from lack of standardization. WirelessHART, released in September 2007, is still the only open communication standard specifically designed for real-time process control applications. This paper presents an innovative distributed tool for capturing WirelessHART packets in the field. In fact, even if tools for compliance assessment...
The definition of several real-time Ethernet (RTE) protocols for industry use implies that new automation systems can include more than one technology. In the future different RTE protocols could share the same network infrastructure, raising the problem of coexistence. The paper introduces a new approach to evaluate coexistence of RTE protocols by means of a distributed RTE traffic emulator/logger...
Distribution of precise time reference in an Ethernet network allows the implementation of distributed measurement systems, overcoming the limitations of a complex architecture. This paper deals with a displacement sensor network that is built over Ethernet and synchronized according to IEEE 1588. Measurement devices share the same time reference, enabling accurate calculation of cross-derived quantities...
This work deals with distributed, multi-probe, instrument for performance analysis of Real-Time Ethernet (RTE) network Particularly, the work is focused on synchronization techniques for distributed measurements. In fact, the accuracy of results (typically jitter and delay) strictly depends on synchronization among distributed probes that sample data. Three synchronization techniques have been implemented...
This paper deals with time synchronization of distributed systems over Industrial Ethernet network. A new simulation model of IEEE1588 PTP is presented and discussed. The development platform used for simulation is OPNETtrade. Architecture of the proposed model is explained in details, highlighting some special features introduced by authors: modelization of drift and rate variations in the local...
This paper deals with a displacement sensor network that is built over Ethernet and synchronized according to IEEE1588. Actually, distribution of precise time reference in an Ethernet network allows implementations of distributed measurement systems, overcoming limitations of complex architecture. The application of the well known IEEE1588 lets sensors to share the same time reference and, in the...
This paper deals with a displacement sensor network that is built over Ethernet and synchronized according to IEEE1588. Actually, distribution of precise time reference in an Ethernet network allows implementations of distributed measurement systems, overcoming limitations of complex architecture. The application of the well known IEEE1588 lets sensors to share the same time reference and, in the...
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