On Wed, 17 Jan 2018 09:27:25 -0500 Dave Cole <linuxcncro...@gmail.com> wrote:
> The text below is at the end of the SOEM page from the link below. > https://openethercatsociety.github.io/doc/soem/index.html > > So how does this work?? The SOEM software itself is GPL, but if you > implement an Ethercat master, you need to get a license ?? Why a license? I have nothing about sharing my work but copyright issues i something different. Then in european union I read something about interoperability so you are always allowed to make your own device to talk to other device. > That's an interesting approach. > > If the SOEM code is all GPL, then how could adding GPL code to GPL code > result in something other than GPL code ? > > From a practical standpoint, I think we need to figure out how to get > networked drives connected to LinuxCNC if we want LinuxCNC to live on. > At some point analog servo drive interfaces will become like 5 1/4" > floppy drives... They were once common. Yes. Michael Büsch already implemented a profibus master. I have it running against an IO module and millions of these kind of devices have been sold. I think he implemented on Rasberry and I had some timing issue before running on ordinary computer but have not looked further because I have been busy with something really good for servos and looking for a new woman. Bandwidth required to replace an analog signal may be surprisingly high and for a control loop even though there are plenty of bandwidth it need to split in many small messages. Ethercat solve this problem in a similar way as cascade coupled shift registers. Nicklas Karlsson ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
