GRAFCET and Petri Nets Outline Introduction GRAFCET - EPFL
GRAFCET and Petri Nets Outline Introduction GRAFCET - EPFL
GRAFCET and Petri Nets Outline Introduction GRAFCET - EPFL
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<strong>Outline</strong><br />
GEMMA<br />
introduction<br />
<strong>GRAFCET</strong><br />
GEMMA<br />
<strong>Petri</strong> nets<br />
Guide d'Etude des Modes de Marche et d'Arrêt<br />
Problems with <strong>GRAFCET</strong><br />
Objectives<br />
Concepts<br />
How to use GEMMA<br />
Advantages<br />
Drawbacks<br />
Real-Time Programming <strong>GRAFCET</strong> <strong>and</strong> <strong>Petri</strong> nets 49<br />
© J.-D. Decotignie, 2007<br />
Real-Time Programming <strong>GRAFCET</strong> <strong>and</strong> <strong>Petri</strong> nets 50<br />
© J.-D. Decotignie, 2007<br />
Problems with <strong>GRAFCET</strong><br />
Objectives of GEMMA inventors<br />
<strong>GRAFCET</strong> is good to describe normal operation but:<br />
Not well suited to describe<br />
Emergency cases<br />
Manual modes<br />
Degraded modes<br />
Does not favor a good separation of operating modes<br />
Does not give a clear vocabulary concerning modes<br />
Does not include any security aspect<br />
Create a graphical tool that can deal with:<br />
Emergency cases<br />
Manual modes<br />
Degraded modes<br />
Estblish a precise vocabulary<br />
Tool show present itself as a guide (checklist)<br />
Real-Time Programming <strong>GRAFCET</strong> <strong>and</strong> <strong>Petri</strong> nets 51<br />
© J.-D. Decotignie, 2007<br />
Real-Time Programming <strong>GRAFCET</strong> <strong>and</strong> <strong>Petri</strong> nets 52<br />
© J.-D. Decotignie, 2007
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