Control system with predictive field device response time...

H - Electricity – 04 – W

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H04W 76/04 (2009.01) G05B 15/00 (2006.01)

Patent

CA 2675236

A host computer communicates with field devices by sending control messages and receiving response messages over a wireless network. When the host computer sends a control message to the wireless network, the host computer is provided with a predictive response time within which the field device receiving the message will respond. The wireless network cycles between a sleep state and an active state based upon a wireless network power cycle. The predicted response time is based upon the current state of the wireless network, the power cycle, and the time required for the field device to turn on, take an action (such as measuring a parameter), and generating a response message.

Dans l'invention, un ordinateur hôte communique avec des dispositifs de terrain, par envoi de messages de commande et par réception de messages de réponse, sur un réseau sans fil. Lorsque l'ordinateur hôte envoie un message de commande au réseau sans fil, l'ordinateur hôte se voit attribuer une durée de réponse prédictive pendant laquelle le dispositif de terrain qui reçoit le message doit répondre. Le réseau sans fil effectue des cycles entre un état de veille et un état actif, en fonction d'un cycle de puissance de réseau sans fil. La durée de réponse prédite est fondée sur :l'état actuel du réseau sans fil, le cycle de puissance, et la durée requise pour que le dispositif de terrian se mette sous tension, effectue une action (notamment, mesurer un paramètre), et génère un message de réponse.

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