Control Program Design for Automated Guided Vehicle Systems via Petri Nets

An ordinary Petri-net (PN) based approach is proposed to design a programmable logical controller (PLC) that prevents collisions among vehicles in an automated guided vehicle (AGV) system. First, a procedure is proposed to model an AGV system as a control-hardware PN. Second, a method is formulated...

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Bibliographic Details
Published in:IEEE transactions on systems, man, and cybernetics. Systems man, and cybernetics. Systems, 2015-01, Vol.45 (1), p.44-55
Main Authors: Luo, JiLiang, Ni, HuiJuan, Zhou, MengChu
Format: Article
Language:English
Subjects:
Algorithm design and analysis
Alignment
Automated guided vehicle
Automated guided vehicles
Coils
Collisions
Control systems
Controllers
Design engineering
discrete event systems
Materials handling
Petri nets
Programmable logic devices
programmable logical controller
Radiation detectors
Supervisors
Vehicles
Wiring
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Summary:An ordinary Petri-net (PN) based approach is proposed to design a programmable logical controller (PLC) that prevents collisions among vehicles in an automated guided vehicle (AGV) system. First, a procedure is proposed to model an AGV system as a control-hardware PN. Second, a method is formulated to design a PN supervisor (the closed-loop PN) for collision prevention. This paper defines the line, merge, divide and intersection alignments, and then adds the transitions and arcs for these four alignments into the control-hardware PN, respectively. As a result, a closed-loop PN is obtained as the supervisor for preventing collisions among vehicles in an AGV system. Finally, a method is introduced to automatically translate a closed-loop PN into a ladder diagram by Boolean expressions. Consequently, the closed-loop PN can be implemented by a PLC. An example is used to illustrate this methodology.
ISSN:2168-2216
2168-2232
DOI:10.1109/TSMC.2014.2342199