(* motor.st *)
FUNCTION_BLOCK Foo
VAR_INPUT
    in : BOOL;
END_VAR
VAR_OUTPUT
    out : INT;
END_VAR
VAR
    persist : INT;
END_VAR
VAR_TEMP
    tmp : INT := 100;
END_VAR
    tmp := tmp + 1;
    persist := persist + 1;
    out := tmp * 100 + persist;
END_FUNCTION_BLOCK