Control of a flexible manufacturing cell by Petri nets in Java language.

1
Control of a flexible manufacturing cell by Petri
nets in Java language.
2
Objetives

• Configurating the PCI SC/I-T controller board via
  CMDs HLI.
• Create a set of Java classes that can access to
  the bus.
• Create a Java implementation of Petri nets to
  control the manufacturing cell via Interbus.

3
The PCI SC/I-T controller board

• 4th. Generation Interbus controller board.
• Remote interface for PCI bus.
• Total configuration of the controlled system
  process data by CMD software.
• Permits permanent storage of process data in its
  EEPROM memory.

4
Interbus
5
CMD

• Phoenix-Contact bus configuration software
• Can export bus configuration to a high-level
  languaje.
• Auto-configuration.

6
JNI

• Interconnect Java with C libraries.
• Solution changing the C functions created by HLI
  for being used from a Java application.
• Java provides this funcionality JNI (Java Native
  Interface).
• Now we only have to find a method for
  representing the system to control Petri nets.

7
Java programming
8
Petri nets

• Petri nets (PN) are a modelling and analysis tool
  especifically adapted to the study of discrete
  events systems.
• A set of classes have been implemented for
  representing a PN Place, Transition, Net.
• Two ways for creating a PN direct code writing
  or importing a PN from an external editor.
• We have used HPSim, a free PN editor that exports
  a PN into a .txt file the class TextToNet
  translates the created PN into a Net object
  inside our project.

9
Petri nets
Inicialization net
Station automatic production independent nets

• Global control net

10
(No Transcript)
11
Control

• Class Coordinator implements the evolution of the
  PN habilited transitions, fires and marking.
  Actualizates the monitor/s values.
• Monitors hold the variables station inputs and
  outputs, array of orders, etc.
• After a fixed delay the class BusManager
  actualizates the station output variables from
  the monitor objects values and actualizates from
  the bus the input values.

12
Xplore project Members
Ramón Piedrafita Moreno Alberto Gran Tejero Oscar
García Flores
Video (Media Player)
Video (Quicktime)
Universidad de Zaragoza