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Audio-active communication stations, communication method and communication system with audio-active communication stations

  • US 6,687,551 B2
  • Filed: 10/27/1999
  • Issued: 02/03/2004
  • Est. Priority Date: 02/10/1997
  • Status: Expired due to Term
First Claim
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1. A listening communication subscriber comprising:

  • a bus system of programmable logic controllers for an industrial control system, wherein the bus system is connected to the listening communication subscriber;

    a unique identifier assigned to the listening communication subscriber; and

    a filter table having at least one entry comprising at least two parameters, a first parameter representing a first destination identifier and a second parameter representing a first source identifier, wherein the listening communication subscriber receives a second destination identifier and a second source identifier corresponding to a data item, and receives and retains the data item when i) the second destination identifier and the second source identifier match the first destination identifier and the first source identifier in the filter table and/or ii) the second destination identifier matches the unique identifier, wherein the listening communication subscriber is a passive communication subscriber and sends the data item via the bus system to another passive communication subscriber allowing a direct communication between the passive communication subscribers.

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