| Autor: |
Rafael G. de Oliveira, José E. R. Cury, Max H. de Queiroz |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
IFAC-PapersOnLine. 53:83-88 |
| ISSN: |
2405-8963 |
| DOI: |
10.1016/j.ifacol.2021.04.070 |
| Popis: |
This paper exploits the Supervisory Control Theory for the synthesis of minimally restrictive and nonblocking discrete-event supervisors that ensure safety specifications for both the normal and non-routine operations of a PID-controlled industrial process. The discrete-event dynamics of the components of a tank level control system is modeled in such a way that supervisors may indirectly avoid undesired level thresholds by deciding on the occurrence of controllable events of a valve, pump and operator interface. A modular control and coordination scheme is used to avoid state-space growth in synthesis. The reduced supervisors are implemented in PLC that turns the pump on and off and saturates the outputs of a PID-controller on a Foundation Fieldbus only when necessary. The experimental results on a real plant shows that supervisory control may effectively assure a safe behavior during startup, steady state and shutdown with minimal intervention on the process. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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