Hi,
This could be related to version compatibility between PLCSIM Advanced and SIMIT.
You mentioned using PLCSIM Advanced V8.0 with SIMIT V11.3 SP2. It might be worth checking the compatibility notes and release documentation for SIMIT V11.3, as some setups may not work properly with newer PLCSIM Advanced versions.
One thing you could try is testing the setup with PLCSIM Advanced V7.x, which is commonly used together with SIMIT V11.3 in many environments.
If this resolves your issue, please mark the answer as accepted so it can help others as well.