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- Petri nets approach for designing the migration process towards industrial cyber-physical production systemsPublication . Cachada, Ana; Pires, Flávia; Barbosa, José; Leitão, PauloPresently, many industries are facing strong challenges related to the demand of customized and high-quality products. These pressures lead to internal company's conflicts where current production systems have a rigid structure, forcing the company into a organization stall when a fast product change is required. Therefore, the need to smoothly migrate traditional systems into more feature-rich and cost-effective systems, namely Cyber-Physical Production Systems (CPPS), became a highly discussed topic. PERFoRM project focuses the conceptual transformation of existing production systems towards plug\&produce ones to achieve flexible and reconfigurable manufacturing environments. In particular, the smooth migration process is considered crucial to effectively transpose existing production systems into truly CPPS. This paper describes the use of Petri nets to design the migration process under the PERFoRM perspective, taking advantage of its inherent capabilities to design, analyze, simulate and validate such complex processes.
- PERFoRM migration strategy towards cyber-physical systemsPublication . Cachada, Ana; Pires, Flávia; Barbosa, José; Leitão, PauloIn the last years, many organizations intend to convert their existing production systems towards ones that are characterized by adaptability, openness, flexibility and modularity. This requires a redesign of existing information processing systems especially related to control, leading possibly to the implementation of Cyber-Physical Production Systems (CPPS). However, the implementation of new control technologies will have a direct impact on the normal operational status of production while engineers will also face several challenges and obstacles in adopting intelligent automation systems. New step-wise migration strategies are required to holistically support industries in their journey towards CPPS taking into account technical, economic and social aspects. This work describes the definition of a migration approach for innovative production systems, particularly those CPPS that are developed under the PERFoRM ecosystem, establishing guidelines for a smooth migration from a traditional system to agile plug-and-produce systems in a secure and efficient way. The designed migration approach comprises five phases, namely Preparation, Options Investigation, Design, Implementation and Deployment, sustained by three different migration strategies, namely One-Shot, Parallel and Phased. The modelling of the migration process uses the Petri nets formalism taking advantage of its inherent capabilities to synthesize the process specifications but also to verify, simulate and validate the correctness of the system specifications during the design phase.