How to log a signal data from the output of a Constant/DS Read block?

Hello,

I'm trying to find a way to be able to log signal data from the output of a constant block and from the output of a DataStore Read block, but I can't achive this, even if all the setup is done corect. Is there some kind of trick that could help me? I don't want to use S-functinos or other methods due to the fact that will slow down my simulation (wich is a large one).

Thanks, Alex