Reference data type

A reference is a variable which only contains a link to a variable or to a function block instance. The used variable may be of elementary or derived data type.

  • A reference is declared using the keyword REFERENCE TO. Then, the name of the referrede data type follows.
  • The pointer is initialised using the REF= operator.
    MyRef : REF_TO INT;
    MyVar : INT;
MyVar := 100;
MyRef := REF(MyVar); //setting of a reference to a variable
MyRef := 200;        //there is a new value of 200 in the variable now
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