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Process for monitoring the state of a safety facility

  • US 6,671,599 B2
  • Filed: 02/04/2002
  • Issued: 12/30/2003
  • Est. Priority Date: 02/02/2001
  • Status: Active Grant
First Claim
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1. Process for monitoring the state of a safety facility via a computer in which a first computer is linked to the safety facility and in which a second computer intended to control an actuator interrogates, prior to any command to turn on and/or turn off the actuator, the first computer as to the state of the safety facility,wherein the second computer interrogates the state of the safety facility directly by sending an encrypted message, wherein the first computer forwards in one direction the question of the second computer to the safety facility and in the opposite direction the response of the safety facility, wherein the second computer verifies the consistency of the response received, and wherein the encryption code is known to the second computer and to the safety facility but is unknown to the first computer.

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