[Etherlab-users] Running a large number of slaves

Geller, Nir nir.geller at servotronix.com
Mon Mar 29 14:22:31 CEST 2021


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?


-----Original Message-----
From: Etherlab-users <etherlab-users-bounces at etherlab.org> On Behalf Of Richard Hacker
Sent: Monday, March 29, 2021 3:09 PM
To: etherlab-users at 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.hacker at 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
- Dr.-Ing. Siegfried Rotthäuser
- Dr. Sven Beermann, Prokurist
Tel.: +49 201 / 360-14-0

Etherlab-users mailing list
Etherlab-users at etherlab.org

More information about the Etherlab-users mailing list