How to insert input into diffrential equation models in LabVIEW

Hi,
I am trying to model a system expressed in a set of differential equations.
using the differential equation function in LabVIEW you can define
a differential equation of the form:
dy/dt +y=0
Into LabVIEW. But How do you insert the input u(t) into that.
Even in example in the student edition of LabVIEW (the book) in pages 437-443
it explains the differential equation set up, but where the input function u(t) will go?
Thanks

Chances to get a good answer for this question will increase largly if you post it to the LabVIEW board rather than to the motion control board.
Best regards,
Jochen Klier
National Instruments Germany

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