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Fault tolerant closed system control using power line communication

  • US 8,130,084 B2
  • Filed: 04/30/2007
  • Issued: 03/06/2012
  • Est. Priority Date: 04/30/2007
  • Status: Expired due to Fees
First Claim
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1. A computer program product comprising a non-transitory computer readable medium having a computer readable program, wherein the computer readable program, when executed in a rack-mounted data processing system comprising an alternating current power distribution and communication (ACPDC) controller and a powered element, causes the rack-mounted data processing system to:

  • receive, by the powered element, a primary alternating current power signal with primary communication data and a redundant alternating current power signal with redundant communication data from the ACPDC controller;

    determining, by a primary controller in the powered element, whether the primary communication data is intended for the powered element;

    determining, by a redundant controller in the powered element, whether the redundant communication data is intended for the powered element;

    responsive to the primary communication data being for the powered element and the primary controller working properly, executing, by the primary controller in the powered element, a set of instructions included in the primary communication data in the powered element;

    responsive to execution of the set of instructions, send, by the primary controller in the powered element, a reply message to the ACPDC controller, wherein the computer readable program to send the reply message to the ACPDC controller further includes the computer readable program that causes the rack-mounted data processing system to;

    inject, by the primary controller in the powered element, the reply message for the ACPDC controller onto the primary alternating current power signal;

    receive, by the ACPDC controller, the primary alternating current power signal with the reply message;

    extract, by the ACPDC controller, the reply message from the primary alternating current power signal;

    determine, by the ACPDC controller, whether the reply message is from the powered element; and

    responsive to the reply message originating from the powered element, send, by the ACPDC controller, the reply message to a programming device external to the rack-mounted data processing system;

    monitoring, by the redundant controller in the powered element, the functions performed by the primary controller in the powered element to determine whether the primary controller is working improperly; and

    responsive to the redundant communication data being for the powered element and the primary controller working improperly, executing, by the redundant controller in the powered element, a set of instructions included in the redundant communication data in the powered element.

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