Hi Igor
I thought of that, too. you can use Ethernet/IP or EtherCat.
On the other site there is  CAN-BUS (non-tcp)

Just sitting on my table desk I have a setup running with Beckhoff EtherCat(TM) 
components. I bought their thesting kit and got it to work with emc.

it runs with etherlab on top of rtai and I have adapted the glue code to create 
the i/o-pins for the componbents. You need one of the compartible ethernet 
chipsets (intel or realtek) to have a realtime driver.

You can even drive their motor controllers directly by providing a position 
signal.

Prices may vary, but to get an impression:
Testing kit (bus interface, 2x4I,2x4O) is around €200, a 32bit incremental 
encoder input is €188, 8 digital-I are €35, 8 digital-O are €39, 2 analog-O 
16bit €145, a 4 axis motor interface 
(4x16bit-incs&4x+/-10V-analog&16xI-digital,16xO-digital,plugs) is €510.

I will set up a wiki page with more info soon.

bye
Ulf


Am 29.09.2010 04:55, schrieb Igor Chudov:
> I think that the trend in industrial machines, is to use Ethernet as
> much as possible inside industrial machines. On the surface, it
> appears to be a very attractive option, with all devices hooked up to
> the network switch and communicating seamlessly, without the mess of
> wires. What are the implications of this for EMC?
>
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