How do banks view rental income when financing Duplexes, Triplexes and Quads?

[Brandon Heath]

Apologies if this is a question that didn't need to be asked. I could find a clear definitive answer.  

I wondering, when trying to finance a property with an FHA or conventional loan. does the bank take the rental income in to consideration. From what I've heard it looks like they don't. Being that these are residential and not commercial, my the landlords finances are the only focus.

One article stated that if you have a good relationship with the bank, its possible that the underwriter could consider this when working on your loan, but this is not for sure. 

Can anyone share their experience? 

Thanks in advance for everyone time.