Abstract
Wireless networked control systems (WNCSs) must ensure that control systems are stable, robust and capable of minimizing the effects of disturbances. Due to the need for a stable and secure WNCS, critical wireless network variables must be taken into account in the design. As wireless networks are composed of several links, factors that indicate the performances of these links can be used to evaluate the communication system in the WNCS. This work presents a wireless network control system composed of ISA 100.11a sensors, a network manager, a controller and a wired actuator. The system controls the liquid level in the tank of the coupled tank system. In order to assess the influence of the sensor link failure on the control loop, the controller calculates the link stability and chooses an alternative link in case of instability in the current link. Preliminary tests of WNCS performance were performed to determine the minimum stability value of the link that generates an error in the control loop. Finally, the tests of the control system based on link stability obtained excellent results. Even with disturbances in the network links, the control system error remained below the threshold.
Highlights
The implementation of new communication technologies in industrial automation allows for the integration of industrial processes with greater efficiency, availability and quality
This study evaluated the implementation of a Wireless networked control systems (WNCSs) based on the evaluation of the links that are part of the control loop
From an examination of the preliminary tests it becomes apparent that the link stability factor allows a prediction of the change in the control system error
Summary
The implementation of new communication technologies in industrial automation allows for the integration of industrial processes with greater efficiency, availability and quality. The systematic association of control and monitoring systems with communication systems generates several benefits. Wireless networked control systems acquired significant technological advancements with the rise of wireless networks, advanced control, embedded computing and cloud computing. The connection of devices spatially distributed for different purposes with wireless networks provided a great increase in applications using wireless sensor networks (WSNs). Critical process control constraints defined some limits of WSN technology. Industrial wireless sensor networks (IWSNs) are a specific field of WSNs, which takes into account reliability constraints, timing deadlines and critical nature of industrial applications
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