Using POSIX realtime

I performed the installation according to the instructions from rodw

forum.linuxcnc.org/ethercat/45336-etherc...-how-to-step-by-step

Search for the ec_generic.so files like  I did.

this is the result:

35375     20 -rw-r--r--   1 root     root        20333 Mai  5 16:57 /usr/lib/modules/6.1.0-34-rt-amd64/updates/dkms/ec_generic.ko
  7093046     20 -rw-r--r--   1 root     root        20333 Mai  5 16:55 /usr/lib/modules/6.1.0-30-rt-amd64/updates/dkms/ec_generic.ko
   526822     20 -rw-r--r--   1 root     root        20333 Mai  5 16:57 /var/lib/dkms/ethercat-dkms/1.6.4/6.1.0-34-rt-amd64/x86_64/module/ec_generic.ko
   526812     20 -rw-r--r--   1 root     root        20333 Mai  5 16:55 /var/lib/dkms/ethercat-dkms/1.6.4/6.1.0-30-rt-amd64/x86_64/module/ec_generic.ko

 

I guess you installed ethercat-dkms, the modules seem to be generated a couple of days ago.
It works now?
If it doesn't I would say to reinstall ethercat master and the drivers
and make sure that the rather lengthy part where the modules are being built for the kernel succeeds.

Unfortunately, it still doesn't work. I've since reinstalled the system, but there's no improvement. I don't understand it. The system worked before the reinstallation. I performed the installation according to the instructions. Anything else isn't possible for me anyway, as I'm just a user and don't know enough to try anything myself.

[  100.533257] EtherCAT: Master module cleaned up.
[  101.670667] EtherCAT: Master driver 1.6.4 1.6.4.g703b611-1+17.1
[  101.670804] EtherCAT: 1 master waiting for devices.

Master0
  Phase: Waiting for device(s)...
  Active: no
  Slaves: 0
  Ethernet devices:
    Main: 80:ee:73:fd:0f:8b (waiting...)
      Link: DOWN

the only thing I noticed:
8.198677] ec_master: module verification failed: signature and/or required key missing - tainting kernel

 

There is something odd with your installation.
I just tried myself to "apt remove ethercat-master ethercat-dkms" followed by "apt install ethercat-master ethercat-dkms" and it worked just fine.
I do not get the "tainted kernel" message.
Can it be that you have compiled the ethercat master yourself at one point? And that the runnning ethercat master is looking for ec_generic in a place where it isn't?
It's a bit of guesswork and searching now.
Can you the command "sudo service ethercat status" and compare the ouput with mine?
 

Edit. Can you also repeat the search for ec_generic, but this time search for ec_master, in the same way?

Edit 2. No need to search. Instead show the output of the command "sudo modinfo ec_master", especially the first filename line.