Wireless Fault-Tolerant Controllers in Cascaded Industrial Workcells Using Wi-Fi and Ethernet

• 作者: Hassanein H. Amer Ramez M. Daoud Tarek K. Refaat
• 来源期刊: 智能控制与自动化(英文)
• 学科: 工学
• 关键词: Fault Tolerance NETWORKED Control Systems (NCS) INDUSTRIAL Informatics WI-FI ETHERNET
• 年，卷（期）: 2013,（4）
• 页码范围: 349-355
• 页数: 7页
• 分类号: TP2

摘要

A Wireless Networked Control System using 802.11b is used to model fault-tolerance at the controller level of an industrial workcell. The fault-tolerance study in this paper presents the cascading of two independent workcells where each controller must be able to handle the load of both cells in case of failure of the other one. The intercommunication is completely wireless between the cells and this feature is investigated. The model incorporates unmodified 802.11b and 802.11g for communication. Sensors send sampled data to both controllers and the controllers to exchange a watchdog. The fault-free and faulty models are both simulated using OPNET Network Modeler. External interference on the critical intercommunication link is also investigated. Results of simulations are presented based on a 95% confidence analysis, guaranteeing correct system performance.