Hi George,
if I understand correctly you are trying to write (change) parameter inside function block (TIMER_:pt) from the running project, right?
Have a look at function block called SETP*: https://www.rexygen.com/doc/PDF/ENGLISH/BRef_ENG.pdf#page=307
This group of blocks enables you to remotely change parameters (Real, Integer, Bool) of function blocks.
If this is not answering your question, please, let me know 🙂
Regards, Tomas