Siemens 500 NIM - Manual (Page 77)

NIM Primitives 4-24 SIMATIC TIWAY I Series 500 NIM User Manual
4.7 Data Element Address Ranges
The maximum data element locations (AAAA field) for each data element
type / controller combination are provided in Table 4-5. All values in the
table are 1-based (first legal value is 1; not zero). Values of zero are not
supported.