×

Interface for industrial controller network card

  • US 6,412,032 B1
  • Filed: 09/30/1999
  • Issued: 06/25/2002
  • Est. Priority Date: 09/30/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. An interface for a network card that is replaceably attached to an industrial controller to transmit messages sent from the industrial controller to a network and to receive messages from the network for the industrial controller, the interface comprising:

  • a first and second buffer;

    a valid buffer register holding a value indicating the first or second buffer;

    a consumer access register holding a value indicating the first or second buffer, or when cleared neither of the first nor second buffers;

    an electronic computer executing a stored program to;

    (a) prior to reading one of the first and second buffers;

    (i) copy a value of the valid buffer register to the consumer access register;

    (ii) confirm that the value of the consumer access register equals the value of the valid buffer register;

    (b) upon confirmation, read a buffer indicated by the consumer access register; and

    (c) upon completion of the reading, clear the consumer access register.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×