Yes, it splits to multiple packets automatically. Just be careful to not use more data than your cycle rate will allow.
Note that initialization and configuration of a large number of slaves is very slow by default, as it occurs in series. The unofficial patchset changes this to occur in parallel (for groups at a time rather than the whole network, to avoid creating too many packets at once). Gavin Lambert Senior Software Developer COMPAC SORTING EQUIPMENT LTD | 4 Henderson Pl | Onehunga | Auckland 1061 | New Zealand Switchboard: +49 2630 96520 | https://www.tomra.com The information contained in this communication and any attachment is confidential and may be legally privileged. It should only be read by the person(s) to whom it is addressed. If you have received this communication in error, please notify the sender and delete the communication. -----Original Message----- From: Geller, Nir Sent: Tuesday, 30 March 2021 1:23 am To: Richard Hacker <h...@igh.de>; etherlab-users@etherlab.org Subject: Re: [Etherlab-users] Running a large number of slaves Hi, Thanks for your reply. You mean that in the case of a large amount of PDO data ( > 1500), a single invoke of ecrt_master_send(master) will result several frames sent out 1 after another? Nir. -----Original Message----- From: Etherlab-users <etherlab-users-boun...@etherlab.org> On Behalf Of Richard Hacker Sent: Monday, March 29, 2021 3:09 PM To: etherlab-users@etherlab.org Subject: Re: [Etherlab-users] Running a large number of slaves EtherCAT and the master are not limited to the ethernet packet size. EtherCAT frames are automatically divided into smaller ethernet packets as required. As long as you're not exceeding physical limits, (like sending ~1,5kb at a rate of 1kHz), you should be fine. Physically EtherCAT can address ~64k slaves on a network. On 2021-03-29 13:22, Geller, Nir wrote: > Hi There, > > I'm trying to setup one ethercat master with a very large number of > ethercat slaves. > > The first obstacle I'm thinking about is a very large amount of data > sent over PDO each cycle, that will definitely exceed 1500 bytes. > > In order to address this issue I want to understand if it is possible > to send more than one frame each cycle? > > Another method could be using jumbo frames. Does the ethercat master > support that? > > Does anybody have practical experience with such a setup? > > Thanks, > > Nir. > > Mit freundlichem Gruß Richard Hacker -- ------------------------------------------------------------------------ Richard Hacker M.Sc. richard.hac...@igh.de Tel.: +49 201 / 36014-16 Ingenieurgemeinschaft IgH Gesellschaft für Ingenieurleistungen mbH Nordsternstraße 66 D-45329 Essen Amtsgericht Essen HRB 11500 USt-Id.-Nr.: DE 174 626 722 Geschäftsführung: - Dr.-Ing. Siegfried Rotthäuser - Dr. Sven Beermann, Prokurist Tel.: +49 201 / 360-14-0 https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.igh.de%2F&data=04%7C01%7Cgavin.lambert%40tomra.com%7Cc94214e8fb1b48f0029e08d8f2ad5668%7C4308d118edd143008a37cfeba8ad5898%7C0%7C1%7C637526173602822005%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=YcXsqSHNccIDDwhMlXvDi8fk5qDl1QtsqUBW%2FPJWZ0Y%3D&reserved=0 ------------------------------------------------------------------------ -- Etherlab-users mailing list Etherlab-users@etherlab.org https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.etherlab.org%2Fmailman%2Flistinfo%2Fetherlab-users&data=04%7C01%7Cgavin.lambert%40tomra.com%7Cc94214e8fb1b48f0029e08d8f2ad5668%7C4308d118edd143008a37cfeba8ad5898%7C0%7C1%7C637526173602822005%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=R5I8zS%2BgfoqIZDkHkRulUESJ7MZZWEG5Dua7uAqBxQs%3D&reserved=0 -- Etherlab-users mailing list Etherlab-users@etherlab.org https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.etherlab.org%2Fmailman%2Flistinfo%2Fetherlab-users&data=04%7C01%7Cgavin.lambert%40tomra.com%7Cc94214e8fb1b48f0029e08d8f2ad5668%7C4308d118edd143008a37cfeba8ad5898%7C0%7C1%7C637526173602822005%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=R5I8zS%2BgfoqIZDkHkRulUESJ7MZZWEG5Dua7uAqBxQs%3D&reserved=0 -- Etherlab-users mailing list Etherlab-users@etherlab.org https://lists.etherlab.org/mailman/listinfo/etherlab-users
