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Programmable controller communication module

  • US 5,307,463 A
  • Filed: 12/07/1992
  • Issued: 04/26/1994
  • Est. Priority Date: 03/08/1990
  • Status: Expired due to Term
First Claim
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1. In a programmable controller having a processor module and a number of functional modules located in a rack and electrically interconnected by a backplane of the rack;

  • a communication module for interfacing the programmable controller to external devices via a plurality of communication links, said communication module comprising;

    a plurality of ports including a plurality of link ports with each link port coupling one of the communication links to the communication module, and a backplane port coupling the communication module to the backplane of the rack;

    a mechanism separate from the programmable controller, by which a user of the programmable controller is able to provide for each link port a designation of one or more of said plurality of ports to which messages are to be sent;

    a first memory means, connected to said mechanism, for storing the designation for each link port; and

    means for transferring the messages received through a given link port to one or more ports as defined by the designation stored in said first memory means for that given link port.

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