Abstract
This paper investigates the performability of hierarchical Wireless Networked Control Systems (WNCS). The WNCS studied can operate in two modes: passive supervisor and active supervisor. It is first shown that the Markov models for both modes are identical. Performability models are then developed and a case study shows how to use these models to help make design decisions. More specifically, it is observed that the performability of a passive supervisor system increases in time while that of an active supervisor system decreases in time.
Highlights
Wireless Networked Control Systems (WNCS) are a trending research topic
The workcell has 30 sensors and 30 actuators communicating over unmodified IEEE 802.11b with two Access Points (APs)
A case study was carried out, based on the methodology outlined in Section 3, in order to compare between the performability of the active and passive supervisor modes for the hierarchical WNCS proposed in [18]
Summary
Wireless Networked Control Systems (WNCS) are a trending research topic. (2015) On the Performability of Hierarchical Wireless Networked Control Systems. The Access Points (APs) are connected through switched Ethernet to a controller [11] [14] [15] Both systems in [13] and [14] were able to fulfill the delay requirements with zero packets drops. In this paper the performability of the active and passive modes in [18] will be compared. A case study will demonstrate the use of the model as a design tool to help make appropriate design choices regarding active and passive supervisor modes. The rest of the paper is divided as follows: Section 2 summarizes the work on the wireless workcells and performability analysis.
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