Sinumerik Alarm 16921 Channel %1 mode group %2 machine data: channel/mode group assignment not allowed or assigned twice
%1 = Channel number
%2 = Mode group number
On powering up, an illegal channel/mode group assignment was detected.
– Alarm display.
– Interface signals are set.
– NC Start disable in this channel.
– NC Stop on alarm.
– Mode group not ready.
– Channel not ready.
Please inform the authorized personnel/service department. Check machine data ASSIGN_CHAN_TO_MODE_GROUP.
Clear alarm with the RESET key in all channels of this mode group. Restart part program.
- Siemens Diagnostics Guide by Siemens