[Emc-users] Ethercat, returning message disappear
While working with Ethecat I have had some problems it does not work in special case with more than three devices of same kind. Checking with wireshark message sent around the ring never arrived back again. Investigating further first with oscilloscope and later on with second computer message actually arrived on second computer. Unless I got everything wrpmg message seems to disappear somewhere in between RJ-45 connect at back and the software socket used to receive the packet. Anyone have made similar experience? Or might know why driver or something else inside the computer would make message disappear? There is a difference between this messages and others on the Ethernet network message arriving back is rather similar to sent message. Nicklas Karlsson ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ethercat returning message disappear
On Sun, 11 Jul 2021 16:34:30 +0200 Nicklas SB Karlsson wrote: > Experimenting with Ethercat. > > Connecting three devices it work perfect. But with more there are cases > then only some messages arrive back to master and some cases there no > messages arrive back to master. Even though message do not arrive back > as expected checking with broadcast write message arrive at last device > and probing with oscilloscope I could see data is sent on Ethernet cable > back towards computer. No sign of other communication problems except > what I am pretty sure is ordinary Ethernet messages destroyed on purpose > by nodes. > > Anyone else here have any experience with Ethercat? A little bit of panic, no good answer but eventually figured myself. Conclusion I made was loopback at last device did not work as expected for more than three devices. Adding a second Ethernet card and sending around the ring however worked as expected, work counter increased as expected sending the "right way" around and not much happened as expected then sending the other way around so I consider it as solved as possible for me. Nicklas SB Karlsson ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ethercat returning message disappear
On 7/11/2021 1:03 PM, Chris Albertson wrote: That said, Ethernet has been made to work on the Raspberry Pi "Pico", How long until Ethercat runs on this $4 part? The Pico is made by a non-profit foundation, so the price will remain low That is very interesting.. Probably not long! Dave ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ethercat returning message disappear
STM does sell some subsidized boards. These are dirt cheap because they want you to develop a product using the parts. My favorite is the Nucleo series This one sells for about $13. st.com/en/evaluation-tools/nucleo-f411re.html <https://www.st.com/en/evaluation-tools/nucleo-f411re.html> It makes every good motion controller. It can handle several channels of steps and encoder pulses at the "few MHz" level. I think the reason for the low prices is that the "f411" part was very wide application, so they want to market it. The market for Ethercat chips is tiny, so they don't want to spend much to market it so they sell the board at full cost with no subsidy. That said, Ethernet has been made to work on the Raspberry Pi "Pico", How long until Ethercat runs on this $4 part? The Pico is made by a non-profit foundation, so the price will remain low On Sun, Jul 11, 2021 at 9:34 AM John Dammeyer wrote: > At $294 (out of stock too) that eval board is way more expensive than a > STMBL kit which also can drive a motor with a much higher power supply > voltage. > > I'm surprised that ST charges so much for something like that. You'd > think with their size they could produce demo boards for really cheap, > people would use them as is and others would then develop products based on > it. But at that cost, one has to have a budget and a marketing plan to > even consider starting. > > John > > > > -Original Message- > > From: Roland Jollivet [mailto:roland.jolli...@gmail.com] > > Sent: July-11-21 9:00 AM > > To: Enhanced Machine Controller (EMC) > > Subject: [Emc-users] Ethercat returning message disappear > > > > No I don't but you might find this interesting. It was in an email I got > > two days ago. > > The software is downloadable; > > > > https://www.st.com/en/evaluation-tools/steval- > > > eth001v1.html?ecmp=tt21493_gl_enews_jun2021=stmDM44500=438016236=mrX5prLpL0WLPr+vcjBGHEiEOnoACPS > > G9a4XfANkxEI= > > > > > > > > On Sun, 11 Jul 2021 at 16:37, Nicklas SB Karlsson wrote: > > > > > Experimenting with Ethercat. > > > > > > Connecting three devices it work perfect. But with more there are cases > > > then only some messages arrive back to master and some cases there no > > > messages arrive back to master. Even though message do not arrive back > > > as expected checking with broadcast write message arrive at last device > > > and probing with oscilloscope I could see data is sent on Ethernet > cable > > > back towards computer. No sign of other communication problems except > > > what I am pretty sure is ordinary Ethernet messages destroyed on > purpose > > > by nodes. > > > > > > Anyone else here have any experience with Ethercat? > > > > > > > > > Nicklas Karlsson > > > > > > > > > > > > ___ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > ___ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ethercat returning message disappear
At $294 (out of stock too) that eval board is way more expensive than a STMBL kit which also can drive a motor with a much higher power supply voltage. I'm surprised that ST charges so much for something like that. You'd think with their size they could produce demo boards for really cheap, people would use them as is and others would then develop products based on it. But at that cost, one has to have a budget and a marketing plan to even consider starting. John > -Original Message- > From: Roland Jollivet [mailto:roland.jolli...@gmail.com] > Sent: July-11-21 9:00 AM > To: Enhanced Machine Controller (EMC) > Subject: [Emc-users] Ethercat returning message disappear > > No I don't but you might find this interesting. It was in an email I got > two days ago. > The software is downloadable; > > https://www.st.com/en/evaluation-tools/steval- > eth001v1.html?ecmp=tt21493_gl_enews_jun2021=stmDM44500=438016236=mrX5prLpL0WLPr+vcjBGHEiEOnoACPS > G9a4XfANkxEI= > > > > On Sun, 11 Jul 2021 at 16:37, Nicklas SB Karlsson wrote: > > > Experimenting with Ethercat. > > > > Connecting three devices it work perfect. But with more there are cases > > then only some messages arrive back to master and some cases there no > > messages arrive back to master. Even though message do not arrive back > > as expected checking with broadcast write message arrive at last device > > and probing with oscilloscope I could see data is sent on Ethernet cable > > back towards computer. No sign of other communication problems except > > what I am pretty sure is ordinary Ethernet messages destroyed on purpose > > by nodes. > > > > Anyone else here have any experience with Ethercat? > > > > > > Nicklas Karlsson > > > > > > > > ___ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Ethercat returning message disappear
No I don't but you might find this interesting. It was in an email I got two days ago. The software is downloadable; https://www.st.com/en/evaluation-tools/steval-eth001v1.html?ecmp=tt21493_gl_enews_jun2021=stmDM44500=438016236=mrX5prLpL0WLPr+vcjBGHEiEOnoACPSG9a4XfANkxEI= On Sun, 11 Jul 2021 at 16:37, Nicklas SB Karlsson wrote: > Experimenting with Ethercat. > > Connecting three devices it work perfect. But with more there are cases > then only some messages arrive back to master and some cases there no > messages arrive back to master. Even though message do not arrive back > as expected checking with broadcast write message arrive at last device > and probing with oscilloscope I could see data is sent on Ethernet cable > back towards computer. No sign of other communication problems except > what I am pretty sure is ordinary Ethernet messages destroyed on purpose > by nodes. > > Anyone else here have any experience with Ethercat? > > > Nicklas Karlsson > > > > ___ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Ethercat returning message disappear
Experimenting with Ethercat. Connecting three devices it work perfect. But with more there are cases then only some messages arrive back to master and some cases there no messages arrive back to master. Even though message do not arrive back as expected checking with broadcast write message arrive at last device and probing with oscilloscope I could see data is sent on Ethernet cable back towards computer. No sign of other communication problems except what I am pretty sure is ordinary Ethernet messages destroyed on purpose by nodes. Anyone else here have any experience with Ethercat? Nicklas Karlsson ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
