Emerson Exchange 365

EIOC periodically sends test messages on the secondary network to check the viability of the secondary network

DeltaV BOL States "EIOC periodically sends test messages on the secondary network to check the viability of the secondary network".  

What does it mean by "Test Messages?" Can I have some clarity?  

• EIOC

Rishi

• 21 Oct 2023 8:24 AM
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1 Reply

• Andre Dicaire

  

  • 26 Oct 2023 11:02 PM

  In general, on a redundant link, traffic between the EIOC and a device occurs over the primary network. To confirm that the secondary link is available, in case it is needed, periodic messages are sent over that link to confirm connectivity. If the test message fails to get a response, the EIOC is able to set an integrity flag and report a loss of connectivity and give you a chance to repair this connection before it is needed.
  
  The EIOC supports multiple protocols so the messaging would depend on the enabled protocol. As to what exactly the test messages look like, one would have to look at some network capture logs to get a sense of that. I'm not aware of any documentation that explains that in any detail.
  
  Note that on the DeltaV network, a similar process occurs. The DeltaV network is a proprietary protocol. On the EIOC 3rd party network, I'd expect the protocols would indicate what type of message would be used.

  Andre Dicaire

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