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System for communicating diagnostic data in an industrial control system

  • US 6,587,900 B1
  • Filed: 05/24/2000
  • Issued: 07/01/2003
  • Est. Priority Date: 05/24/2000
  • Status: Expired due to Term
First Claim
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1. A method for communicating non-I/O data between components of an industrial control system (ICS), the ICS having components including control or automation devices and a programmable logic controller, the method comprising the steps of:

  • a) having one of the components transmit the non-I/O data formatted as a message frame in the same way as I/O data is formatted as a message frame, including having a message type identifier to identify that the message frame bears non-I/O data; and

    b) having another of the components, one for which the non-I/O data is intended, receive the encapsulated non-I/O data as a message frame, wherein the receiving component identifies the non-I/O data based on the message type identifier conveyed with the message frame, and further wherein the receiving component extracts the non-I/O data from the message frame.

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