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System and method for fail safe process execution monitoring and output control for critical systems

  • US 6,523,139 B1
  • Filed: 12/17/1999
  • Issued: 02/18/2003
  • Est. Priority Date: 12/17/1999
  • Status: Expired due to Term
First Claim
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1. A fault detection apparatus for use in a system that transmits data signals over at least one signal path via a bus connecting computation and I/O modules of a system, the apparatus comprising:

  • a status monitor for monitoring validity of real-time control system state variable parameters, wherein the real-time control system state variables are made available to an independent partition, process, or module for independent monitoring of intermediate steps in a functions calculation, the control system state variable parameters characterizing a plurality of critical systems that communicate on the bus, wherein the control system state variables are present on the bus;

    a state comparator comparing the real-time control system state variables with respect to expected system state variable conditions;

    variable producing controller and variable consuming controller for validating output command validity based on expected individual state variable conditions; and

    memory for storing state variable parameters.

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