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Apparatus and method for sharing data among a plurality of control devices on a communications network

  • US 6,169,928 B1
  • Filed: 06/30/1998
  • Issued: 01/02/2001
  • Est. Priority Date: 06/30/1998
  • Status: Expired due to Term
First Claim
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1. A system of programmable logic controllers communicating with each other under a predetermined communications protocol, the system comprising:

  • a plurality of programmable logic controllers including a producer controller and at least one consumer controller; and

    a communications network connecting the producer controller to the consumer controller, the producer controller taking a data sample and transmitting the data sample to the consumer controller over the network, the consumer controller checking for loss of data samples transmitted from the producer controller to the consumer controller.

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