TITLE:
Evaluating the Performance of Fault-Tolerant S2A vs. In-Loop Controller Models for Ethernet-Based NCS
AUTHORS:
Eslam Moustafa, Hassan Halawa, Ramez Daoud, Hassanein Amer
KEYWORDS:
Networked Control Systems, Ethernet, OMNeT++, Sensor Actuator Networks, Fault-Tolerance
JOURNAL NAME:
Intelligent Control and Automation,
Vol.5 No.2,
May
27,
2014
ABSTRACT:
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.