Murr Elektronik impact67 IO-link master - stays in PRE-OP state

Dear all,

I am trying to configure a Murr elektronik Impact67 (54632) to work with the ctrlX core. 

I have succesfully loaded the ESI file and setup the EoE. The ethercat communication works as far as I can see.  I can reach the webserver without any problems. The problem that I have is that the IO-link master stays in the PRE-OP state. 

Our local Murr tech support thought it had something to do with the settings of the ports. The state will not change to OP if there are connectivity issues with th IO link device. I tried changing them to Digital output/input, but this does not make any difference unfortunately. 

When opening the diagnostics of the ethercatmaster the following error is shown:

Is there anybody who has an idea what is the issue? On the forum I found a similiar post. 

Thank you in advance!