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Programmation d’un GRAFCET en langage LADDER
Il peut être intéressant dans certains cas de figure, de pouvoir traduire un GRAFCET en langage
LADDER (notamment, quand l’automate ne prends pas en charge le langage GRAFCET).
Les étapes de GRAFCET peuvent être considérées comme des fonctions mémoires. Elles disposent
d’une condition d’activation (CA) et d’une condition de désactivation (CD).
Exemple :
CA1 = X0 . (marche . position haute)
CA2 = X1 . position basse
CA0 = X2 . position haute
L’équation de chaque étape est donc de la forme :
Etape X = ion
désactivat
de
condition .
. . Etape X + condition d’activation
Pour notre exemple, on obtient : X1 = 2
CA . X1 + CA1
Exercice : donner le programme en ladder du GRAFCET suivant d’une perceuse automatisée.
Condition de
désactivation
Condition de
d’activation
Auto maintien
Etape Condition d’activation : une étape est activée si
l’étape immédiatement précédente est active ET
que la transition associée est vérifiée.
Condition de désactivation : une étape sera
désactivée si la condition d’activation de l’étape
suivante est validée.
1 Descendre
Position basse
2 Monter
Position haute
0
Marche ET position haute
1 KM1
S3
2 KM1
S2
0
S1 . S2
KM2
KM3
S1 : BP « départ cycle »
S2 : capteur position haute
S3 : capteur position basse
KM1 : rotation foret
KM2 : Descente de la tête de perçage
KM3 : Montée de la tête de perçage
www.alloacademy.com
Equations d’activation des étapes : Equations d’évolution du GRAFCET
CA1 = …………………………………………………… X1 = …………………………………………………………..
CA2 = …………………………………………………… X2 = …………………………………………………………..
CA0 = …………………………………………………… X0 = …………………………………………………………..
Equations des pré-actionneurs
KM1 = ……………………………………………………
KM2 = ……………………………………………………
KM3 = ……………………………………………………
www.alloacademy.com
CORRIGE
www.alloacademy.com

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2Grafcet-Exercice-corrigé-02(www.alloacademy.com).pdf

  • 1. Programmation d’un GRAFCET en langage LADDER Il peut être intéressant dans certains cas de figure, de pouvoir traduire un GRAFCET en langage LADDER (notamment, quand l’automate ne prends pas en charge le langage GRAFCET). Les étapes de GRAFCET peuvent être considérées comme des fonctions mémoires. Elles disposent d’une condition d’activation (CA) et d’une condition de désactivation (CD). Exemple : CA1 = X0 . (marche . position haute) CA2 = X1 . position basse CA0 = X2 . position haute L’équation de chaque étape est donc de la forme : Etape X = ion désactivat de condition . . . Etape X + condition d’activation Pour notre exemple, on obtient : X1 = 2 CA . X1 + CA1 Exercice : donner le programme en ladder du GRAFCET suivant d’une perceuse automatisée. Condition de désactivation Condition de d’activation Auto maintien Etape Condition d’activation : une étape est activée si l’étape immédiatement précédente est active ET que la transition associée est vérifiée. Condition de désactivation : une étape sera désactivée si la condition d’activation de l’étape suivante est validée. 1 Descendre Position basse 2 Monter Position haute 0 Marche ET position haute 1 KM1 S3 2 KM1 S2 0 S1 . S2 KM2 KM3 S1 : BP « départ cycle » S2 : capteur position haute S3 : capteur position basse KM1 : rotation foret KM2 : Descente de la tête de perçage KM3 : Montée de la tête de perçage www.alloacademy.com
  • 2. Equations d’activation des étapes : Equations d’évolution du GRAFCET CA1 = …………………………………………………… X1 = ………………………………………………………….. CA2 = …………………………………………………… X2 = ………………………………………………………….. CA0 = …………………………………………………… X0 = ………………………………………………………….. Equations des pré-actionneurs KM1 = …………………………………………………… KM2 = …………………………………………………… KM3 = …………………………………………………… www.alloacademy.com