A Dimarts 04 Novembre 2008, Jan Kiszka va escriure: > 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.
but someone is working on this? do you know if someone of fsf is looking on it? > > 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. well, there are some the code, bsd licensed. Are you saying that there is a functional code? Well, probably I didn't understand the answer. > > 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. So, someone could implement this kind of protocols "over" rtnet, no? > 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). Have you think about it? To promote some kind of standard protocol for industrial using rtnet? > If your task is to attach industrial devices that talk a fixed protocol > (or set of protocols), those will dictate the wire. Sure, but for example now I can choose if I buy a canbus card or use a ethernet card. The manufacturer offers the two options. > But that may still > allow to implement the "intelligent" nodes based on RTnet+<high-level > protocol> under Linux. but still the problem is communicate with the industrial device. Thanks for the answer. Regards, Leo -- -- Linux User 152692 PGP: 0xF944807E Catalonia
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