Sinumerik Alarm 16781 Channel %1 block %2 master spindle/axis missing
%1 = Channel number
%2 = Block number, label
The master spindle/axis has not been programmed in the part program.
– Alarm display.
– Interface signals are set.
– Correction block is reorganized.
Modify part program.
Clear alarm with NC START or RESET key and continue the program.
- Siemens Diagnostics Guide by Siemens