My German is very poor. I can't follow what he is saying but he has enough English subtitles that I can figure out how it works. There is also a part-2 video. Almost certainly someone on this list can tell us if he is saying anything we'd need to know.
First off he is using a LAPTOP. He is using the laptop's built-in Ethernet port and a software Ethercat driver. Yes the laptop's latency specs are likely poor but it does not mater because he is using some very sophisticated servo controllers The servo controller is an Indra Drive C It uses three electrical connections to 1. AC mains, 2. the servo motor and its encoder and 3. Ethercat. I skimmed over the Indra Drive user manual. It looks like is uses "drive follows command" type programming. The laptop does not need to see any feedback. It only sends desired position and velocity. The Intra Drive has dozens of parameters that must be set to control things like maximum acceleration, the units used to specify position and velocity, limits for temperature sensors a couple dozen more. Most LinuxCNC systems ar set up so the PC sends out things like PWM or step/directin. These are VERY low level but with this setup, not the communication is at a much higher level, even the home and limit switches are detected by the controller. On Fri, Oct 27, 2017 at 10:14 AM, Dave Cole <linuxcncro...@gmail.com> wrote: > Check out this video - this is 2013 and he is using Ethercat with LinuxCNC. > Unfortunately I can't understand him. :-( > > https://www.youtube.com/watch?v=yR9rCFavFjU > > Dave > > On 10/27/2017 6:40 AM, Nicklas Karlsson wrote: >> >> I make my own hardware, it's only for fun and I do not intend to earn >> money >> on it. It's however useful to know how it works during normal working >> hours. >> >> 2017-10-27 11:07 GMT+02:00 theman whosoldtheworld <bleachk...@gmail.com>: >> >>> I use the suggestion and indication from linuxcnc forum: >>> >>> https://forum.linuxcnc.org/24-hal-components/22346-ethercat-hal-driver >>> >>> about SOEM, The basic implement is not realtime .... so is ok for user >>> command, not so for drive command. Any how my decision is not utilize >>> ethernet bus for drive position/velocity/torque command. Mesa analogue >>> signal and feedback encoder on mesa card are too easy and precise signals >>> to use to go for alternative methods that usually do not give such good >>> performances. Keep in mind that realtime on ethercat is not a universal >>> value ... commercially there are devices that go under 1 ms but others >>> that >>> arrive up to 10-20ms .... for example kunbus has made devices on pi3 with >>> ethercat and more, but with a realtime of 5ms. >>> >>> I have made the opinion that bus-rt on ethernet are very nice, but they >>> will really be useful only in some have. in the meantime it is best to >>> play >>> on to be ready and wait. If you would use it for data comm between some >>> device or for connect some device without problem of 5-10ms response time >>> all work fine. I could not recommend any ethercat for professional use as >>> a >>> result of my experiences. But I'm sure many others have taken advantage >>> of >>> it. >>> >>> Last but no least, there is also the security issue. Here in Europe >>> ethernet-ip and secure signals do not agree much for example. In >>> addition, >>> many drive manufacturers do not have safety over ethercat even if they >>> have >>> the bus. >>> >>> >>> regards >>> bkt >>> >>> 2017-10-26 18:19 GMT+02:00 Nicklas Karlsson >>> <nicklas.karlsso...@gmail.com> >>> : >>> >>>> On Thu, 26 Oct 2017 13:36:26 +0200 >>>> theman whosoldtheworld <bleachk...@gmail.com> wrote: >>>> >>>>> I'm working with it now using linuxcnc implementation ... and in past >>>> >>>> with >>>>> >>>>> backoff device. ... >>>> >>>> I just started to look a day or two ago, which Ethercat implementation? >>>> >>>> ------------------------------------------------------------ >>>> ------------------ >>>> Check out the vibrant tech community on one of the world's most >>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>> >>> ------------------------------------------------------------ >>> ------------------ >>> Check out the vibrant tech community on one of the world's most >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >> >> ------------------------------------------------------------------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
