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Evaluating the Performance of Fault-Tolerant S2A vs. In-Loop Controller Models for Ethernet-Based NCS

Intelligent Control and Automation 2014年第2期5卷 81-90页

作者： eslam moustafa Hassan Halawa Ramez Daoud Hassanein Amer Electronics Engineering Department American University in Cairo Cairo Egypt

Two different controller-level fault-tolerant models for Ethernet-based Networked Control Systems (NCSs) are presented in this paper. These models are studied using unmodified Fast and Gigabit Ethernet. The first is an in-loop controller model while the second is a direct Sensor to Actuator (S2A) model. OMNeT++ simulations showed the success of both models in meeting system end-to-end delay and strict zero packet loss (with no over-delayed packets) requirements. It was shown in the literature that the S2A model has a lower end-to-end delay than the in-loop controller model. It will be shown here that, on the one hand, the in-loop fault-tolerant model performs better in terms of less total end-to-end delay than the S2A model in the fault-free situation. While, on the other hand, in the scenario with the failed controller(s), the S2A model was shown to have less total end-to-end delay.

关键词： Networked Control Systems Ethernet OMNeT++ Sensor Actuator Networks Fault-Tolerance

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Multi-Node Fault-Tolerant Two-Cell Real-Time S2A Network

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Intelligent Control and Automation 2016年第2期7卷 25-38页

作者： Merna N. Abou Eita Mostafa W. Hussein Ahmed A. Ibrahim Shereen S. Abouelazayem Mennatallah A. Morsi eslam A. moustafa Hassan H. Halawa Ramez M. Daoud Hassanein H. Amer Hany M. ElSayed Electronics and Communications Engineering Department The American University in Cairo New Cairo Egypt Electronics and Communications Engineering Department Cairo University Giza Egypt

This paper presents a novel fault-tolerant networked control system architecture consisting of two cells working in-line. This architecture is fault-tolerant at the level of the controllers as well as the sensors. Each cell is based on the sensor-to-actuator approach and has an additional supervisor node. It is proven, via analysis as well as OMNeT++ simulations that the production line succeeds in meeting all control system requirements with no dropped or over-delayed packets. A reliability analysis is then undertaken to quantitatively estimate the increase in reliability due to the introduction of fault-tolerance.

关键词： Fault-Tolerance NCS S2A In-Line TMR Ethernet OMNeT++ Reliability

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