HEIDENHAIN TNC 426 (280 476) - Manual (Page 447)

420 12 MOD Functions
12.2 Sof
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Numbers and Option Numbers
12.2 Software Numbers and Option
Numbers
Function
The software numbers of the NC, PLC and the SETUP floppy disks
appear in the TNC screen after the MOD functions have been
selected. Directly below them are the code numbers for the installed
options (OPT:):
No option OPT 00000000
Option for digitizing with triggering touch probe OPT 00000001
Option for digitizing with measuring touch probe OPT 00000011