1 and fub2 extend

-on product that extends [...] that extend the scope

that extends another POU [...] blocks that extend [...] . Therefore, SubFB EXTENDS

Extends : Specification [...] with the EXTENDS keyword [...] that you cannot extend the function

Advanced : Extends [...] of the interface that extend

, you can extend

15 and later you can extend

INTERFACE ItfBase EXTENDS [...] Derived1 EXTENDS ItfBase METHOD [...] Derived2 EXTENDS ItfBase METHOD

EXTENDS and IMPLEMENTS [...] by EXTENDS and IMPLEMENTS [...] _BLOCK LongString EXTENDS

-by-value). The variable can be extended