Host Engineering Forum

General Category => Do-more CPUs and Do-more Designer Software => Topic started by: Henryp on November 08, 2013, 10:20:15 AM

Title: Detecting a down Ethernet link
Post by: Henryp on November 08, 2013, 10:20:15 AM

With a Do more CPU if the internal Ethernet link goes down can the CPU detect it? How about with an Ecom 100 in the rack?

Title: Re: Detecting a down Ethernet link
Post by: BobO on November 08, 2013, 12:20:52 PM

Never thought to do that actually. No, there is currently no way to monitor link status from within the CPU unless the port is being used for something like Ethernet I/O, in which case it would start ringing up errors. Theoretically it would be possible to make the hardware do it, although I'm not sure whether it would take firmware alone or also gate array.

Title: Re: Detecting a down Ethernet link
Post by: ATU on November 08, 2013, 01:06:11 PM

What is the device on the other end?

Title: Re: Detecting a down Ethernet link
Post by: Henryp on November 08, 2013, 04:32:45 PM

It is a DL PLC. I want to use the Domore as a frontend data collector. When we were testing I had the port unplugged and didn't realize it

Title: Re: Detecting a down Ethernet link
Post by: ATU on November 08, 2013, 05:12:35 PM

Would a heartbeat technique help? 

Title: Re: Detecting a down Ethernet link
Post by: CReese on November 12, 2013, 05:14:45 PM

As I was just instructed, use the PING instruction with a host that you know will always be on. Could use a router or the closest node on your network.