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Method of application protocol monitoring for programmable logic controllers

  • US 7,308,327 B2
  • Filed: 05/12/2006
  • Issued: 12/11/2007
  • Est. Priority Date: 05/12/2006
  • Status: Active Grant
First Claim
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1. A method of application protocol monitoring for a manufacturing line, said method comprising the steps of:

  • constructing a manufacturing line model for the manufacturing line;

    utilizing logic for a programmable logic controller (PLC);

    executing a control logic simulation of the PLC logic;

    validating the PLC logic against the manufacturing line model;

    creating a database containing validated I/O tag expected intents confirmed from the control logic simulation; and

    applying the application protocol monitoring device to a network for the manufacturing line to monitor traffic across the network and continuously compare the I/O tag status across the network to the database of validated I/O tag expected intents.

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