AliasDeviceType not supported (TwinCAT 4020.28 Safety project not loading)

Hello,

I've came across this issue on some recently working projects while opening them:

I've read the topic regarding the Safety project not loading, but none of those points solved the issue.

Exporting again and trying to reload safety project is not working.

All the suggested remote managers are installed.

We have 5 similar machines with almost identical projects, and all of the 5 are affected.

The strange thing is, that normally we use a portal server to connect to the machines, but the same issue comes up on my laptop too. The older versions of the projects are also affected.

Seems like some kind of xml file corruption or misreading by twincat, while loading the safety config. Too bad, that the error doesn't show, which one is affected. Tried to search for it manually, but didn't find it.

Okay, so one of my colleagues found the issue, and after that, I realized what happened.

There was a missing 'BoschRexroth_IndraDrive_ECAT_SoE_01V18.XML' from the 'C:\TwinCAT\3.1\Config\Io\EtherCAT folder', but it was hard to find, since the error message didn't showed, which fsoe was faulty.

After many manual search, I found, that the subtype 792 and vendor 36 meant Bosch Rexroth IndraDrive, and that's how he found the missing xml.

It was missing, because of a recent issue with other projects, I deleted 2 of these xml's: one was v18, other one was v27. These had version conflicts, and it was not clear for me, which one was faulty, so I deleted both. Right now it's clear, that one of these has to be there (sadly the older projects are not compatible with the newer versions, so this will be an issue in our server).

This topic tells more about this:

/knowledge-base-xhhdjzl0/post/twinsafe-4020-error-multiple-definitions-exist-for-the-aliasdevice-K6rDfHaz4Si9wcn