Barrier operator with fault control

  • US 6,737,821 B1
  • Filed: 08/31/1999
  • Issued: 05/18/2004
  • Est. Priority Date: 04/09/1991
  • Status: Expired due to Fees
First Claim
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1. In a movable barrier operator comprising a movement control apparatus for controlling movement of a barrier in response to commands, the method comprising:

  • sending a command to the movement control apparatus specifying one of open, close, or stop movement of the barrier;

    checking the movement control apparatus to determine whether the command is being correctly performed;

    generating a signal when the checking step determines that the command is not being correctly performed; and

    controlling barrier movement in response to the generated signal.

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