Introduction
References to variables can be assigned in FBD application programs.
A reference can be de-referenced in FBD application programs.
For more information, refer to Reference Data Type.
FBD Examples using the Reference Data Type:

The EF, REF
, takes a variable
as an input parameter (type ANY) and provides its address as output parameter (type REF_ANY).
The EF, MOVE
, can assign a reference to a variable to another reference.
If the input parameter is (REF(MyVariable)), MOVE
has the same effect as the REF
EF.
The EF, TON
, takes ptrToMyBool^ as an input parameter to dereference the reference ptrToMyBool.