First of all I would like to thank everyone, who shared their thoughts.
As a result I did another tour of web searching.
In mailing list archive I found and read the discussion, that started here:
http://www.mail-archive.com/emc-users@lists.sourceforge.net/msg04064.html

2011/2/3 andy pugh <bodge...@gmail.com>:
> Try Ethercat ( http://en.wikipedia.org/wiki/EtherCAT )

Thanks, this helped!
I asked the initial question, because I had suspicion that using
ethernet is not self-explanatory - there are too much of different
protocols, so getting in trouble is quick, fast and easy.

2011/2/3 Peter C. Wallace <p...@mesanet.com>:
> I believe an individual has added Ethercat support to EMC, but only
> I/O, not drives so far as I know.

The second attempt of searching revealed that Ulf Dambacher had some
success in getting EtherCAT working with EMC2.
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Etherlab


2011/2/3 Dave <e...@dc9.tzo.com>:
> I have used all these interfaces.
>
> If this is a one-off job, I would consider buying a
> protocol bridge box. .
> These boxes aren't cheap. I think they are in the $1000 plus range, but
> they work.

Thanks for introduction on those interfaces!
I would like to avoid this suggestion of bridging different protocols,
because I have yet to learn how to handle one at a time, so dealing 2
of them at once would be just too much for me at this moment :)

2011/2/4 Kim Kirwan <k...@kimkirwan.com>:
> Andy mentioned Ethercat, but what happened to Realtime Ethernet,
> wasn't someone working on bringing this to EMC2:
>
> http://www.rtnet.org/

What I understood from the thread in the mailing list archive, is that
would be something like reinventing the wheel. EtherCAT has all the
necessary qualities.
http://www.mail-archive.com/emc-users@lists.sourceforge.net/msg04138.html

After looking at the wiki page, where Ulf posted the code for comp
module, I have come to conclusion that EMC can talk to any EtherCAT
slave device with according tweaks in comp module to create necessary
HAL pins. Is this correct? Could anyone else, please, comment on this?


By the way, are there any plans for EtherCAT I/O cards from Mesa or
Pico? I had little difficulties finding motherboardboard for the
welding robot, because D510 boards are disappearing from shops in my
country and I think that situation discussed in the previously
mentioned mail-thread of parallel port going to disappear is actually
happening.

Viesturs

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