Papers by S.A. Foyo-Valdes
This work presents a systematic methodology to model Automated Manufacturing Systems using Petri ... more This work presents a systematic methodology to model Automated Manufacturing Systems using Petri Nets. The modelling strategy consists in the definition and the interconnection of some generic Petri Net models applied to the discrete-event dynamic behaviour of the equipments and its procedures. It is based on the industrial standards ISA-88 and ISA-95, where the classification of equipment and the definition of their generic process tasks are suggested, separately of the product manufacturing recipes. The approach provides a formal and ordered methodology to study industrial automated systems where the equipment availability, storage limitations, sharing resources and logic precedence between process tasks appear in the Petri model. A complete case of study related to an automated cell is presented which includes a network of PLC’s and industrial robots.
This paper proposes a modeling strategy for automated Flexible Manufacturing Systems (FMS) that i... more This paper proposes a modeling strategy for automated Flexible Manufacturing Systems (FMS) that incorporates automated guided vehicles (AGV's) as material handling systems. Using the industrial standard ISA-95, the task-based coordination of equipment and storages is constructed considering process restrictions, logical precedence conditions, shared resources and the assignment of the robots to move work pieces individually or in subgroups. The Petri Net model calls in the low level to formation, marching and collision avoidance control laws, for omnidirectional robots. The hybrid architecture is implemented and validated for the case of a FMS and four mobile robots.
This paper presents the modeling and supervisory control of a real
Automated Manufacturing System... more This paper presents the modeling and supervisory control of a real
Automated Manufacturing System. The plant model is obtained from the process definition and material-handling tasks, according to the ISA-88 and ISA-95 standards, including the communication of different local controllers. Then, a hierarchical-decentralized supervisory control scheme is implemented where the low-level is composed of a decentralized supervision of the task precedences and storage limitations restrictions. The high-level supervisor deals only with the product recipes using the subset of events related to the process tasks only. Therefore, the scheme
provides a clear separation between the equipment operations and the product manufacturing actions. The supervisory control is implemented on a PC communicated through a network of PLC’s and local controllers with industrial robots.
Uploads
Papers by S.A. Foyo-Valdes
Automated Manufacturing System. The plant model is obtained from the process definition and material-handling tasks, according to the ISA-88 and ISA-95 standards, including the communication of different local controllers. Then, a hierarchical-decentralized supervisory control scheme is implemented where the low-level is composed of a decentralized supervision of the task precedences and storage limitations restrictions. The high-level supervisor deals only with the product recipes using the subset of events related to the process tasks only. Therefore, the scheme
provides a clear separation between the equipment operations and the product manufacturing actions. The supervisory control is implemented on a PC communicated through a network of PLC’s and local controllers with industrial robots.
Automated Manufacturing System. The plant model is obtained from the process definition and material-handling tasks, according to the ISA-88 and ISA-95 standards, including the communication of different local controllers. Then, a hierarchical-decentralized supervisory control scheme is implemented where the low-level is composed of a decentralized supervision of the task precedences and storage limitations restrictions. The high-level supervisor deals only with the product recipes using the subset of events related to the process tasks only. Therefore, the scheme
provides a clear separation between the equipment operations and the product manufacturing actions. The supervisory control is implemented on a PC communicated through a network of PLC’s and local controllers with industrial robots.