I am following this manual to integrate a Ethernet/IP soft start (Allen Bradley SMC-50) to a S7-1513F-1PN.

https://support.industry.siemens.com/cs/tz/en/view/109782314

When I initiate the communication I get the error code 8201 - invalid interface.

The interface also runs as a Profinet Master in parallel, may this cause this error? As far as I know, the interface shopuld be capable to do open user communication.

Thanks for the response.

To conclude this topic: Recreating the instance DB of the FB did the job.