Using POSIX realtime

Thank you very much Hakan, I have attached the result as a file 

 

It's on the right track but I wonder how to pin-point exact reason and solution.
I have seen spelling mistakes cause this, but yours seems fine.
Can be the old network driver not unloading.
It's along those lines, the master can not get control over the network interface.
Can you set debug "ethercat debug 1", restart the ethercat server and show the dmesg again?
 

I can't enable debug mode. Could this be part of the problem?

roger@roger:~$ echo 1 | sudo tee /sys/module/ethercat/parameters/debug
[sudo] Passwort für roger: 
tee: /sys/module/ethercat/parameters/debug: Datei oder Verzeichnis nicht gefunden
1
roger@roger:~$ sudo modprobe -r ethercat
modprobe: FATAL: Module ethercat not found.
roger@roger:~$ sudo systemctl stop ethercat
roger@roger:~$ sudo modprobe -r ethercat
modprobe: FATAL: Module ethercat not found.

Just type the command "ethercat debug 1"