Siemens CP 243-2 - Manual (Page 46)

Interface to the User Program in the S7-200 CPU
2-20
SIMATIC NET CP 243-2 AS-i Master
C79000-G8976-C142/02
Banks 32–47: Analog input data of the AS-i slaves
Via these areas, you can access the analog input data of the AS-i slaves that
support the AS-i slave profile 7.3 or 7.4 (see Section 3.1.2).
Banks 48–63: Reserved area
These areas are reserved for later expansions and cannot be used.