The ‎SUPER‎ pointer is a special variable which is used for object-oriented programming.

‎SUPER‎ is the pointer of a function block to the base function block instance from which the function block was generated. The ‎SUPER‎ pointer also allows access to the implementation of the methods of the base function block (base class). A ‎SUPER‎ pointer is automatically available for each function block. You can use ‎SUPER‎ only in methods and in the associated function block implementations.

Dereferencing of the pointer: ‎SUPER^‎

Using the ‎SUPER‎ pointer: With the ‎SUPER‎ keyword, you call a method which is valid in the instance of the basic class or parent class.

Example

ST

‎SUPER^.METH_DoIt();‎

FBD/CFC/LD

FUNCTION_BLOCK FB_Base
VAR_OUTPUT
        iCnt : INT;
END_VAR

METHOD METH_DoIt : BOOL
iCnt := -1;

METHOD METH_DoAlso : BOOL
METH_DoAlso := TRUE;

FUNCTION_BLOCK FB_1 EXTENDS FB_Base
VAR_OUTPUT
        iBase : INT;
END_VAR

THIS^.METH_DoIt();  //Call of the methods of FB_1
THIS^.METH_DoAlso();

SUPER^.METH_DoIt();   //Call of the methods of FB_Base
SUPER^.METH_DoAlso();
iBase := SUPER^.iCnt;

METHOD METH_DoIt : BOOL
iCnt := 1111;
METH_DoIt := TRUE;

PROGRAM PLC_PRG
VAR
    myBase : FB_Base;
    myFB_1 : FB_1;
    iTHIS : INT;
    iBase : INT;
END_VAR
myBase();
iBase := myBase.iCnt;
myFB_1();
iTHIS := myFB_1.iCnt;