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This paper presents techniques that enable the modeling and analysis of redundancy in remote monitoring and control systems. Hardware redundancy and software redundancy are both implemented in the proposed system organically. To model and analyze the redundancy, a formalism to derive Petri net (PN) model from state transition diagram is constructed and the monitor compatible condition is considered. Software redundancy mechanism in manager side is also modeled based on PN. This approach makes redundancy modeling and analysis possible in terms of well-developed concepts and methods in PN theory. By the analysis of the PN model, designers can obtain reliable and effective measures that would compare different schema in the early phases of design, and select the best one. Our approach is illustrated and validated on STPNPlay by an example.

MODELING AND ANALYSIS OF REDUNDANCY IN REMOTE MONITORING AND CONTROL SYSTEMS VIA PETRI NETS