Hi Oliver,
I guess we're confused on what you are attempting to do. If I understand you correctly, you would like to have some sort of timing vi that ensures your vi will execute once every tenth of a second. Without getting into too much detail about RealTime, I would assume you simply want to use Wait Until Next Multiple.vi. You would wire a value of 10 to the input of this vi which would make sure that if the vi finishes early, it will wait until the next tenth of a second multiple.
Hope this helps.
Cheers,
Emilie Kopp | Applications Engineer | National Instruments