Application of the supervisory control theory to automated systems of multi-product manufacturing

Silva, D.B.; Santos, Eduardo Alves Portela; Vieira, Agnelo Denis; Paula, Marco Antonio Busetti de

doi:10.1109/efta.2007.4416836

Cited by 5 publications

References 12 publications

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Microcontroller based supervisory control of a solar tracker

Searle

Hashtrudi-Zad

2017

2017 IEEE 30th Canadian Conference on Electrical and Computer Engineering (CCECE)

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Microcontroller Based Supervisory Control of a Solar Tracker Kevin SearleThe Supervisory Control theory (SCT) of Discrete-Event Systems is concerned with the design of supervisors that can generate appropriate control command sequences that meet the plant design specifications. Examples of these sequences include the startup and shut-down command sequences of a spacecraft engine. This thesis addresses the implementation of Supervisory Controller (SC) executing on microcontroller hardware. The plant studied is a 2 degree-of-freedom solar tracker. Existing implementations of Supervisory Control Theory focus on Programmable LogicController (PLC) based systems. PLCs are mainly used in process control and manufacturing applications. These implementations have proven advantages but suffer from numerous drawbacks. The hardware is large, expensive and over engineered for many embedded system applications. Additionally, a number of disconnects between Supervisory Control Theory and their practical application exist. These include but are not limited to: the Avalanche Effect, Inexact Synchronization and Simultaneous Events. This thesis extends the application of SCT to the field of microcontroller-based embedded systems. Methods to minimize or remove the effects of Avalanche Effect, Inexact Synchronization, and Simultaneous Events are analyzed in a microcontrollerbased environment.Additionally, design procedures for the modelling and implementation of a supervisory controller executing within a microcontroller are explored. To this end, a physical implementation of a real system was created and documented. An offline computation of the system supervisor is derived in MATLAB and stored in the system's onboard memory as a State Transition Table (STT). An optimized storage method is developed that allows for fast execution of state transitions and a low memory footprint. vi

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Microcontroller based supervisory control of a solar tracker

Searle

Hashtrudi-Zad

2017

2017 IEEE 30th Canadian Conference on Electrical and Computer Engineering (CCECE)

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Application of the supervisory control theory in the project of a robot-centered, variable routed system controller

Silva

Santos

Vieira

et al. 2008

2008 IEEE International Conference on Emerging Technologies and Factory Automation

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This paper aims to present the development of the controller of a manufacturing system based on the application of the Supervisory Control Theory, in particular an extension of such theory named Local Modular Control approach. The foundations of this work are a Supervisory Control Architecture and a Programmable Logic Controller (PLC) method of implementation of such architecture, both of these found in the literature. The manufacturing system is constituted by an industrial robot that plays the role of a transport system and three workstations. We show that applying formal methods of controller synthesis, as well as applying the referred PLC method of implementation makes easier to express the control specifications, to check out the system's controlled behavior, and specially, to make the necessary modifications when the system has to be reconfigured.

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