PLC implementation of decentralized supervisory control for Dynamic Flow Controller
Ali A. Afzalian, Mahvash Noorbakhsh, Seyedbehzad Nabavi · 2008
The paper discusses synthesis and physical implementation of decentralized supervisory controller of the Dynamic Flow Controller (DFC) as a discrete-event system. The local plants have been used for synthesizing of decentralized supervisory controller for easier implementation of overall control system. A heuristic method is developed for easier implementation of the supervisor on a Programmable-Logic-Controller (PLC), to overcome the implementation problems in the auto/manual mode of DFC operation. A step - by- step procedure is developed to generate a ladder diagram which implements the DES supervisory control on a PLC. The proposed approach for implementation of modular controllers can be used to implement any modular supervisory control in practice.