摘要:
Example methods and apparatus to limit a change of a drive value in an electro-pneumatic controller are disclosed. A disclosed example method includes determining a slew limit of a controller based on noise in at least one of a control signal or a feedback signal, calculating a drive value based on the control signal and the feedback signal, and changing the calculated drive value if a difference between the drive value and a previous drive value is greater than the slew limit of the controller.
摘要:
A fluid pressure apparatus to which a plurality of machines are connected via a manifold and which is provided with a controller circuit including a memory that stores control steps. Each controller circuit operates control valves and sensor in accordance with an operation instruction from a sequencer to ascertain the control condition and judge the occurrence of a failure. Therefore, a high-degree control operation can be carried out without laying an overload on the sequencer.
摘要:
Une unité de commande (22) intelligente installée sur site, destinée à réguler un processus, reçoit des signaux et envoie une sortie d'instructions par un circuit (18) à deux fils alimentant l'unité de commande (22). Une partie d'entrée (50) reçoit les signaux, lesquels peuvent être des instructions représentatives d'instructions ou d'ensembles d'instructions, des variables de processus détectées par des unités de commande extérieures ou des valeurs de consigne représentatives d'un état de processus voulu. Les instructions sont représentatives d'une condition de commande du processus, et règlent une partie de commandes (52) se trouvant dans l'unité de commande (22), afin de produire la sortie d'instructions (58) conformément à la condition de commande. La sortie d'instructions (58) peut être une fonction de la différence entre la valeur de consigne du processus et une variable de processus, ou une fonction d'une combinaison linéaire d'une variable de processus ainsi que son intégral de temps calculé et des fonctions dérivées du temps. Une partie de détection (100) se trouvant dans ladite unité de commande (22) peut détecter et établir l'échelle d'une variable de processus afin de produire également la sortie d'instructions (58). Ladite unité de commande (22) peut comprendre une partie régulatrice, commandée par la sortie d'instructions (58), laquelle régule l'application d'une force mécanique, hydrolique, pneumatique ou électromagnétique appliquée au processus.
摘要:
A fluid pressure apparatus of this invention comprises a cover for covering a plurality of fluid pressure devices included in said apparatus. The cover serves to give the fluid pressure apparatus a consolidated appearance.
摘要:
A fluid pressure apparatus to which a plurality of machines are connected via a manifold and which is provided with a controller circuit including a memory that stores control steps. Each controller circuit operates control valves and sensor in accordance with an operation instruction from a sequencer to ascertain the control condition and judge the occurrence of a failure. Therefore, a high-degree control operation can be carried out without laying an overload on the sequencer.
摘要:
A fluid pressure apparatus of this invention provides advanced control without imposing an excessive burden on a sequencer. When a plurality of fluid pressure apparatuses are connected to one another by manifolds, the individual fluid pressure apparatuses are provided with controller circuits each having a memory inputted with a control step, wherein each of the controller circuits activates each of control valves and a sensor based on an operating instruction issued from the sequencer to thereby execute processes such as confirmation of a controlled state, a trouble decision, etc.
摘要:
A fluid pressure apparatus to which a plurality of machines are connected via a manifold and which is provided with a controller circuit including a memory that stores control steps. Each controller circuit operates control valves and sensor in accordance with an operation instruction from a sequencer to ascertain the control condition and judge the occurrence of a failure. Therefore, a high-degree control operation can be carried out without laying an overload on the sequencer.
摘要:
The present invention discloses a machine-accessible medium having instructions stored thereon that, when executed, cause a machine to receive a control signal and a feedback signal as well as to calculate from the control signal and the feedback signal a drive value. Furthermore the medium calculates a slew limit based on at least one or more of the drive value, the feedback signal, the control signal, and a noise level of the feedback signal, whereby the slew limit can change according to the state of the drive value, the feedback signal, the control signal and/or the noise level. The method further determines if a difference between the drive value and a previous drive value is greater than the calculated slew limit of an electro-pneumatic controller; and changes the calculated drive value based on the slew limit.