I did not, but with the lack of info, it was not a wrong answer .
Back on topic.
Your analog input is likely to be 0..27648, but can be different depending on your hardware. An resistance input for example (RTD, PT100, T-couple) might be read as resistance with a scale of 10 or 100. Negative values are also possible.
How are you going to control your output?
Is there a reason you do not want to use standard blocks?