Transitions
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Dans l'article précédent figurent les équations de sortie de l'automate. Ce nouvel article explicte les transitions permettant de passer d'un état à un autre. Les sorties Qi des bascules sont conformes à la notation déjà utilisée. Quant aux entrées Ji et Ki, elles correspondent aux bascules de sorties Qi. Les entrées auxiliaires sont notées :
- PBT : présence de toutes les tensions de chauffage ;
- PHT : présence de la haute tension ;
- C15 : compteur valant exactement 15 ;
- C255 : compteur valant exactement 255.
Entrées | Sorties | ||||||||||||
Q2 | Q1 | Q0 | I | PBT | PHT | C15 | C255 | J2 | K2 | J1 | K1 | J0 | K0 |
0 | 0 | 0 | X | X | X | X | 1 | 1 | 1 | ||||
0 | 0 | 0 | 1 | X | X | X | X | 0 | 1 | 1 | 1 | ||
0 | 1 | X | X | X | X | 0 | 1 | 1 | 1 | ||||
0 | 0 | 1 | 1 | X | X | X | 0 | 1 | 1 | 1 | |||
0 | 1 | 1 | X | 1 | X | 1 | 1 | 1 | |||||
0 | 0 | 1 | 1 | 1 | X | 1 | X | 0 | 1 | 1 | 1 | ||
0 | 1 | 0 | X | X | X | X | 0 | 1 | 1 | 1 | |||
0 | 1 | 0 | 1 | 0 | X | X | X | 1 | 1 | 1 | |||
0 | 1 | 0 | 1 | 1 | X | X | 0 | 0 | 1 | 1 | 1 | ||
1 | 1 | 1 | X | X | 1 | 1 | 1 | 1 | |||||
1 | 1 | X | X | X | X | 1 | 1 | 1 | |||||
1 | 1 | X | 1 | 1 | X | 1 | 1 | 1 | |||||
1 | 1 | X | 1 | X | X | 1 | 1 | 1 | |||||
1 | 1 | X | 1 | 1 | 1 | X | 1 | 1 | 1 | ||||
1 | 1 | 1 | X | X | 1 | 1 | 1 | ||||||
1 | 1 | 1 | X | X | 1 | 1 | 1 | ||||||
1 | 1 | X | X | 1 | 1 | 1 | |||||||
1 | 1 | 1 | 1 | X | X | 1 | 1 | 1 | |||||
1 | X | X | X | X | 1 | 1 | 1 | ||||||
1 | 1 | X | 1 | 0 | X | 0 | 1 | 1 | 1 | ||||
1 | 1 | X | 1 | X | 1 | 1 | 1 | 1 | |||||
1 | 1 | X | X | X | X | 1 | 1 | 1 | |||||
1 | 1 | X | 1 | 1 | X | X | 1 | 1 | 1 | ||||
1 | 1 | 1 | 1 | X | X | X | X | 1 | 1 | 1 | |||
1 | 1 | 1 | X | X | X | X | 1 | 1 | 1 |
Tab. 1 : transitions d'états
Les cases entourées de rouge sont celles correspondant à un défaut de fonctionnement indiqué comme tel. À noter : l'automate est conçu de telle sorte qu'une fois la procédure d'extinction lancée, les alimentations s'arrêtent totalement. Il est envisageable d'ajouter une transition supplémentaire pour éviter l'extiction en cas de réenclenchement du bouton marche/arrêt.
De la même manière, un défaut lors de la phase d'extinction provoque un passage par l'état 111 qui n'est pas maintenu car I vaut zéro. Il est possible d'ajouter un état 110 correspondant à un défaut durant la procédure d'extinction.
Ces deux améliorations feront l'objeet d'un prochain article.
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