# Fatek HMI formulation

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#### mehran65

##### Newbie level 4
Hi everyone.
I want to use formulation in my Fatek HMI ( model: p5043n)
Is anyone knows that how can I define the program to ask a formula from me to enter it any time?
In fact, the formula becomes change every time so I need to define the HMI to ask a formula anytime need to calculate the data.

Thanks a lot.

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