The IEC operator is used for assigning a variable to another variable of a corresponding type.
Because MOVE is available in the CFC, FBD, and LD editors, you can also use the EN/ENO functionality
there for variable assignment.
CFC in connection with the EN/ENO function
CODESYS assigns the value of the var1 variable to the var2 variable only when en_i is TRUE.
ST
ivar2 := MOVE(ivar1);
The corresponds to:
ivar2 := ivar1;