Compared to the regular program, Subroutine in program. By the Block Diagram Icon, it means the one who has to send information to and through the Connector. In LabVIEW, we will call this Subroutine SubVI.
As subroutines Subroutine in the normal means by Icon Block Diagram One of the input and output through. Connector in LabVIEW, which we will call Subroutine that SubVI.
As a sub program Subroutine in normal program to by Icon means Block Diagram one with sending in & out through. Connector which, in LabVIEW we call this Subroutine SubVI.