Leopold Palomo-Avellaneda wrote: > Dear people, > > I don't know if this is an off topic but I would like to ask about it to the > list if someone could clarify my ideas. > > We are thinking to buy a rail to put our industrial robot. This rail will be > controller by a servo. We have looking on the market, and there are some > technologies to control via ethernet devices. > > I have looked only the "open" and the manufacturers offers me a protocol > called ethercat, who claims to be open source and gpl, but it has a conflict > with the licenses.
...which should be resolved at some (hopefully) near point in the future. > Powerlink, but I have understood that someone in the list > have no good opinion. ??? There is no [L]GPL'ed stacked for Powerlink yet, but at least some BSD-licensed code. > > So, someone knows if exists industrial devices that could be controlled by > rtnet? or someone could give some opinion about all this mess of "open" > protocols? RTnet is not directly comparable to "full-blown" industrial RT Ethernet approaches. RTnet is an open stack that can even be used to implement some of those protocols. But it does not come with its own abstraction of industrial devices (drives, I/O clamps etc.). Ie. there are no "RTnet-compliant" industrial device definable due to this undefined highest layer (industrial applications). If your task is to attach industrial devices that talk a fixed protocol (or set of protocols), those will dictate the wire. But that may still allow to implement the "intelligent" nodes based on RTnet+<high-level protocol> under Linux. Jan
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