Implementation of a Decentralized Supervisory Controller for an Assembly Cell Using a Discrete-Event Systems Approach

Author

Ekanayake, Thushara ; Herath, Damith C. ; Dewasurendra, Devapriya S.

Author_Institution

Dept. of Production Eng., Peradeniya Univ.

fYear

2006

fDate

8-11 Aug. 2006

Firstpage

485

Lastpage

490

Abstract

In the context of supervisory control of discrete-event systems, decentralized control is a well-established area of research. In this paper we present an implementation of such controllers for an assembly cell with two-assembly stations (SCARA robots), in a laboratory scale computer integrated manufacturing (CIM) system. Step by step implementation, conflict avoidance between local supervisors and difficulties encountered are discussed. Petri nets are used as the modelling tool and Lin and Wonham framework is used as the control architecture. Assembly stations are modelled as intelligent agents. A separate software module called order processing module (OPM) is used to handle orders into and out of the system and to schedule the two-assembly stations

Keywords

Petri nets; computer integrated manufacturing; decentralised control; discrete event systems; industrial manipulators; order processing; robotic assembly; scheduling; software agents; CIM; Petri net; SCARA robot; assembly cell; computer integrated manufacturing; decentralized supervisory controller; discrete-event system; intelligent agent; order processing module; scheduling; Assembly systems; Computer architecture; Computer integrated manufacturing; Control systems; Discrete event systems; Distributed control; Laboratories; Petri nets; Robotic assembly; Supervisory control;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial and Information Systems, First International Conference on

Conference_Location

Peradeniya

Print_ISBN

1-4244-0322-7

Type

conf

DOI

10.1109/ICIIS.2006.365776

Filename

4216637