This subrange data type is identical to ANALOG_DATA with the exception that its initial value is 0 (zero) instead of the default lower bound of -4095 , as shown in its textual representation:

TYPE ANALOG_DATAZ : (* A subrange type with a non-default initial value *)
    INT(-4095..4095) := 0 ;
END_TYPE

See the ADD_ANALOG_DATAZ FB type for an example of the use of this data type.