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Control system with predictive field device response time over a wireless network

  • US 7,924,774 B2
  • Filed: 01/11/2007
  • Issued: 04/12/2011
  • Est. Priority Date: 01/11/2006
  • Status: Active Grant
First Claim
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1. A control system comprising:

  • a plurality of field devices;

    a host computer for sending control messages to and receiving response messages from the field devices;

    a wireless network having a plurality of wireless nodes that cycle between a sleep state and an active state according to a wireless network power cycle, at least one of the field devices being associated with each node; and

    a gateway between the host computer and the wireless nodes;

    the gateway providing the host computer, in response to a message addressed to one of the field devices, a predicted time value of when the field device will respond to the message based on the conditions comprising whether the wireless network is currently active or asleep and the amount of time left before the wireless network becomes active or goes to sleep, wherein the host computer determines whether a communication with one of the field devices has failed based on the expiration of the predicted time value.

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