Hello Mr. Stephan,
I am currently experiencing the same problem with this, I have tried to do the suggestions you gave but the plc with servo driver still cannot connect.
My devices are X20CP1484 and ACOPOS1640 with Powerlink V1 8AC112.60-1 module.
For now the condition is that only the red LED on the acopos1640 blinks 4x. If you look at the manual, the code shows an error for the AC110 module.
I would be very grateful for your advice.
Best Regards,
Hasan