Read-only sequence controller

G - Physics – 04 – G

Patent

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Details

G04G 15/00 (2006.01) G05B 19/045 (2006.01) G05B 19/048 (2006.01)

Patent

CA 2102844

READ-ONLY SEQUENCE CONTROLLER A read-only sequence controller has a main circuit and a sub-circuit operated by a command signal from the main circuit at a predetermined cycle time. The cycle time of the main circuit is longer than the sub-circuit in order to control the sub-circuit. A sensor is provided on an outlet of a machine for detecting a discharge of a work at every cycle end and producing a discharge signal which is fed to the sub-circuit. In normal operation, the sub-circuit is re-started in response to the discharge signal and the command signal from the main circuit. When abnormality occurs, the sensor does not produce the discharge signal. In response to absence of the discharge signal and to the command signal, a stop control circuit produces stop signals to stop the main circuit and the sub-circuit.

Séquenceur à mémoire morte possédant un circuit principal et un sous-circuit actionné par un signal de commande du circuit principal à un temps de cycle prédéterminé. Ce temps de cycle du circuit principal est plus long que celui du sous-circuit, ce qui permet de gérer le sous-circuit. Un détecteur placé sur une sortie d'une machine permet de détecter une décharge de travail à chaque fin de cycle et de produire un signal de décharge qui est transmis au sous-circuit. En fonctionnement normal, le sous-circuit est remis en marche en réponse au signal de décharge et au signal de commande du circuit principal. Lorsqu'il y a anomalie, le détecteur ne produit pas de signal de décharge. Lorsqu'il n'y a pas de signal de décharge, et en réponse au signal de commande, un circuit de commande d'arrêt produit des signaux d'arrêt afin de bloquer le circuit principal et le sous-circuit.

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