HEIDENHAIN MANUALplus 620 Technical Manual page 1519

Operand Abbreviation
Byte B (byte)
Word W (word)
Double word D (double word)
Constant K
String S
January 2012
Address range
B0 to B9999 (8 bits)
B0 to B255 are free; depending on the definition in the
*.CFG file of the PLC compiler, the defined range is deleted
only after entering the code number 531210, not during
reset (nonvolatile range). If no range is defined in the *.CFG
file, B0 to B127 is the nonvolatile range.
B256 to B2047 are reserved for the NC-PLC interface if you
are using the old TNC-API. They are freely usable if you are
using the new symbolic API.
B2048 to B9999 are free; they are deleted during reset.
–2 147 483 647 to +2 147 483 647
S0 to S99
8.4 Operands 1519