DLL function called on input change

Hi everybody,
I know this is very basic; but I didn't get it by my own. I'm very new to LabVIEW and wasn't able to find a solution in the forum.
I want to call a function from a DLL every time when I press a button; but unfortunately the function is only called at start-up.
So, how can I call a DLL function on a change of some input?
I attached a screenshot. With the stuff I tried. It didn't work. Now the function is called twice during start-up.
Thanks in advance and best regards,
Chris
Solved!
Go to Solution.
Attachments:
2014-12-22 03_32_04-PwrInterface.vi Block Diagram _.png ‏7 KB

Hi Dennis,
Thanks that helped me out. Now I know also where to find good examples.
Thank you also Natas!
Best regards
-Chris

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Solved!
Go to Solution.
Attachments:
call A55292Find.vi ‏10 KB

nkang11 wrote:
Hi Mr. Kalbermatter,
As you told me, I should try to use the defined enumeration words as control and indicator.
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