Hello,
I've found the solution to the problem, it might be of help for someone else.....
The problem was that the safety configuration was not aligned with the result of the linear unit measurement.
1. I downloaded the current project with WorkVisual.
2. I've done another linear unit measurement procedure and wrote down the result for what concerning $ET1_TFLA variable.
3. I wrote the result in Workvisual in the linear unit configuration panel
4. Performed a rebuild of the project
5. Uploaded the "new" project on the KRC
6. Checked the safety configuration as usual, updated it and everything works.
Surely it was due to the old versione of the original project, but iI had no time for waiting for Kuka to send me the new version of KSS.
Have a good day
Marco