You can also configure the slave to the desired configuration (either manually
via "ethercat download" command line or with another master such as TwinCAT)
before you use "ethercat cstruct" to generate your desired PDO layout (but do
still read through it to verify that it is as expected). This may or may not
be simpler than just modifying the default cstruct tables to your desired
config, depending on various factors.
After that, as Graeme says, you should write your application code to do the
necessary configuration assuming that no "ethercat" commands have previously
been run. Reboot your slave before testing your app to ensure that it's not
depending on some previous manual configuration, and read the example code
(especially the "user" example).
It's not really something you can do from a bash script.
Gavin Lambert
Senior Software Developer TOMRA Fresh Food
COMPAC SORTING EQUIPMENT LTD | 4 Henderson Pl | Onehunga | Auckland 1061 | New
Zealand
Switchboard: +49 2630 96520 | https://www.tomra.com
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-Original Message-
From: Etherlab-users On Behalf Of Graeme
Foot
Sent: Monday, 26 July 2021 1:47 pm
To: Fontana Nicola ; etherlab-users@etherlab.org
Subject: Re: [Etherlab-users] Configuring EL7047 stepper driver
Hi Nicola,
The first thing is don't try to configure slaves via the ethercat command line
utility. You need to run an application (see the examples folder for various
example applications).
The second thing is don't try to manually configure each slave by direct SDO
calls, there are functions that do all of that for you that you call as part of
the application.
The applications first step is to configure the slaves using for example:
ecrt_master_get_slave
ecrt_master_slave_config
ecrt_slave_config_pdos
ecrt_slave_config_create_sdo_request
ecrt_slave_config_reg_pdo_entry
ecrt_slave_config_sdo8 etc
ecrt_slave_config_dc
A devices default configuration can be retrieved using the "ethercat cstruct"
command. You can then modify it if your slave allows modification. You can
download the slaves esi file from Beckhoff if you want to use a non-standard
configuration, using it as a reference to set up your own cstruct data.
Once ready, the application calls ecrt_master_activate() and then calls the
following commands (as a minimum) in a realtime loop:
ecrt_master_receive
ecrt_domain_process
ecrt_domain_queue
ecrt_master_send
The application will bring the slaves up from PREOP to OP, applying the
configuration along the way. If a slave is repowered the master will
automatically re-apply the configuration and bring it back to OP.
Regards,
Graeme
-Original Message-
From: Etherlab-users On Behalf Of Fontana
Nicola
Sent: Sunday, 25 July 2021 01:02
To: etherlab-users@etherlab.org
Subject: [Etherlab-users] Configuring EL7047 stepper driver
Hi all,
I think this issue is not related to the ethercat software per-se but maybe
someone has already met something similar or can point me into the right
direction.
I'm trying to configure the EL7047 stepper driver in position controller mode
without encoder (by default it is in velocity mode):
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.beckhoff.com%2Fen-en%2Fproducts%2Fi-o%2Fethercat-terminals%2Fel7xxx-compact-drive-technology%2Fel7047.htmldata=04%7C01%7Cgavin.lambert%40tomra.com%7C16a57fd89b504bb5809808d94fd745eb%7C4308d118edd143008a37cfeba8ad5898%7C0%7C1%7C637628608287133729%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000sdata=7nrcZ%2BRZV042Qzmhkyow%2B5Dam266ZgyJp7bRKX%2BZe84%3Dreserved=0
No matter what: it stays in PREOP state after having configured it.
Whenever I try to put it in SAFEOP/OP I get:
Failed to set SAFEOP state, slave refused state change (PREOP + ERROR).
AL status message 0x001E: "Invalid input configuration".
Here is the full script I'm using:
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.com%2F-%2Fsnippets%2F2153453data=04%7C01%7Cgavin.lambert%40tomra.com%7C16a57fd89b504bb5809808d94fd745eb%7C4308d118edd143008a37cfeba8ad5898%7C0%7C1%7C637628608287133729%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000sdata=Amp%2FeLCSJ7gRo6mLXMdACw8az8EbiNrurOTWdO0vcvc%3Dreserved=0
It runs successfully and I am sure the settings are changed (I checked them
many times). For a couple of parameters, with a datatype smaller than a byte
but bigger than boolean, I had to explicitely set the datatype to `uint8`, and
AFAIK this is the only thing that "stinks".
The Beckhoff manual keeps reporting TwinCAT screenshots instead of explaining
