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Apparatus and method for supporting wireless actuators and other devices in process control systems

  • US 8,837,354 B2
  • Filed: 11/23/2009
  • Issued: 09/16/2014
  • Est. Priority Date: 04/24/2009
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a wireless leaf node configured to modify operation of an industrial process; and

    a plurality of wireless access points configured to transmit data to the wireless leaf node in specified time slots within a data frame and to receive an acknowledgement from the wireless leaf node in response to successful receipt of the data by the wireless leaf node, wherein a first one of the access points is configured to;

    transmit a first data message to the wireless leaf node during a first portion of a first time slot; and

    in response to determining that no acknowledgement is received to the transmission of the first data message, perform a first retransmission of the first data message to the wireless leaf node during a second portion of the first time slot;

    transmit a second data message to the wireless leaf node during a first portion of a second time slot; and

    in response to determining that no acknowledgement is received to the first retransmission, determine whether to perform a second retransmission of the first data message to the wireless leaf node after the first portion of the second time slot during a second portion of the second time slot based on whether an acknowledgement is received to the transmission of the second data message and a priority order for message retransmissions.

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