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Dual Ethernet stack for maximum speed access to a PLC

  • US 20030195975A1
  • Filed: 04/14/2003
  • Published: 10/16/2003
  • Est. Priority Date: 09/10/1997
  • Status: Active Grant
First Claim
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1. An interface module for receiving data requests from a remote location in order to provide access to a programmable logic controller from a communication network, the module comprising:

  • a central processing unit;

    a real time operating system operating the central processing unit;

    a network interface for communicating with the communication network;

    a back plane driver for communicating with the programmable logic controller through a back plane of the programmable logic controller;

    a dual protocol stack;

    a client task for communicating with the back plane driver and the protocol stack for initiating received requests;

    a server task for communicating with the back plane driver and the protocol stack for responding to received requests; and

    a protocol task for communicating with the back plane driver and the protocol stack for receiving and responding to protocol task requests.

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