Régulation de la fréquence d’acquisition

Missions

Dispositif de mesure élimine les « soi-disant » rebuts d’une machine-outil

The manual re-measurement of the rejects establishes that most of the rejects were not actually rejects. An exact analysis brought forward the reason: forklift truck traffic passing close to the machine created vibrations that caused pseudo rejects.

Solution

Le système Ethernet pour la mesure de longueur MSX-E3711 fait l’acquisition simultanée des capteurs inductifs. La connexion Modbus TCP est utilisée pour le paramétrage de l’acquisition. Les valeurs mesurées sont transmises à un automate par Ethernet (l’automate contrôle la machine). Le système fait également l’acquisition continuelle des signaux d’un capteur de référence. Lorsqu’un chariot-élévateur se rapproche, le capteur commence à vibrer. Il en est de même pour les autres capteurs, ce qui mènerait inévitablement à des valeurs erronées. C’est pourquoi l’automate réduit la fréquence d’acquisition du système MSX-E3711 pour assurer la précision de l’acquisition malgré les vibrations : une commande Modbus active la fonction de calcul de la moyenne intégrée au système MSX-E3711. Ceci réduit la vitesse d’acquisition mais permet de conserver la précision des valeurs. Dans des cas critiques, l’acquisition peut même être stoppée. Dès que le chariot-élévateur s’éloigne de la machine et que les vibrations ont disparu, l’automate remet les paramètres de mesure via commande Modbus au niveau initial. La vitesse d’acquisition est alors à nouveau à son maximum.

Cette solution permet de réduire considérablement les rebuts dus à des erreurs de mesure et d’augmenter la qualité et la pertinence des valeurs.

Produits utilisés :

Régulation de la fréquence d’acquisition

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