✅ (Solved) EL7342 | Working

Hello,

I'm trying to use and EL7342 and two yellow leds are on.
After having a look at the documentation I saw that is because is underpower or some missconfiguration.

- I assume that the configuration it have, is gone once I launch the master. Right? Or that still there in the eeprom?

- Does anyone have tried that EL7342 before?
- Do I have to declare the EL7342 configuration in .hal before launching the HAL/LinuxCNC?


Regards

Hello,

you have to tell the card its configuration. This are the values that are listet under the startup tab in the twincat projekt.
There are two ways:
-sdoconfig objects in the ethercat_conf.xml or
-loading an initcmd xml file for each card . You can snippout the initcmds for each card out of the device export xml in the twincat project.

about initcmds there is an example on the linuxcnc-ethercat github

Hello, Thanks for the reply.

I didn't know that I have to specify the configuration on the EL7342, good to know.

Regards

Hi,

Just trying to figure out about the .xml, if the project was made for TwinCAT 3 there is no a way to export that configuration, right?

I saw how to do in TwinCAT 2 but no for the version 3.

Regards

there is not much difference...

select the device in the left tree -> edit menü -> export xml description.

After this you got an xml file with the complete device description.
In this file there has to exist an chapter <EtherCATMailbox> within this there is an chapter <CoE> and there is the initcmd block. compare if the blocks looks like the example on linuxcnc-ethercat.

Be careful the initcmds blocks exists two times in the file. the first is for the systemmanager to automatical create the device (this is what etherlab/linuxcnc can't do..... spoiler: yet    .) the second block near the end of the file contains the needed data.

Thanks I will have a look at it and also to the FSOE config I have there in TwinCAT.

Regards.

Hi db1981,

I just tried to export the xml but I did in other way. (Not sure of I did well...)
I'm using Microsoft Visual Studio for the project I have for students.

Here goes from the part I took that info:
pasteboard.co/NtIVHFPEYVMf.png

And this is how the info looks like (I exported individually, but each of those have the same .xml value):

<?xml version="1.0" encoding="ISO-8859-1"?>
<EtherCATMailbox><CoE><InitCmds><InitCmd><Transition>IP</Transition><Timeout>0</Timeout><Ccs>1</Ccs><Index>61569</Index><SubIndex>1</SubIndex><Data>00001400</Data></InitCmd></InitCmds></CoE></EtherCATMailbox>


Could you just let me know if is that enough?.

Best regards.

Hi,


After adding my config in the ehtercat-conf.xml I got the following error when launching:

Note: Using POSIX non-realtime
rtapi_shmem_new failed due to shmget(key=0xacb572c7): Invalid argument
lcec_conf: ERROR: couldn't allocate user/RT shared memory
Waiting for component 'lcec' to become ready...

Any hint?

Regards

hi,

you are trying to run linuxcnc in an sim environment not in realtime....

'Note: Using POSIX non-realtime

Have you configured and build linuxcnc for realtime?
Is the realtime kernel running on this machine 'uname -a' = preempt RT .

lcnc install:

/debian/ ./configure uspace
/src/ ./configure --with-realtime=uspace

Hi thanks for the reply.

I'm actually using right now github.com/grotius-cnc/hal-core to interact with the pins without lcnc installation.

[Edit]
Yes I'm using Preempt RT. In concrete:
Linux linuxcnc 4.19.71-rt24-v7l+ #1 SMP PREEMPT RT Fri Jan 1 21:15:16 GMT 2021 armv7l GNU/Linux