Using a Petri-net-based approach for the real-time supervisory control of an experimental manufacturing system
Küçük Resim Yok
Tarih
2000
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
SPRINGER LONDON LTD
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
A new Petri-net-based design technique, called the inhibitor arc method, for the synthesis of compiled supervisors for discrete event systems is used to solve a forbidden state problem in an experimental manufacturing system. The technique used offers the following advantages: 1. The closed-loop (i.e. controlled) behaviours of the systems are non-blocking and do not contradict the forbidden state specifications. 2. The closed-loop behaviours of the systems are maximally permissive within the specifications. The supervisors to be synthesised consist of a controlled automation Petri net (APN) model of the system. Automation Petri nets include the following extensions to the ordinary Petri-net framework: sensor readings as firing conditions at transitions and actions assigned to places. Ladder logic diagram (LLD) code is used to implement the supervisors on programmable logic controllers (PLC). It is important to note that the supervisors obtained are correct by construction, therefore there is no need for verification. This paper particularly shows the applicability of previous results [1] to low-level real-time control where the role of the supervisor is to arrange low-level interaction between the control devices, such as motors, actuators, etc. This is done by considering an experimental manufacturing system.
Açıklama
Anahtar Kelimeler
discrete event systems (DES), ladder logic diagrams (LLD), manufacturing systems, Petri nets, programmable logic controllers (PLC), supervisory control
Kaynak
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
16
Sayı
7
