Sinumerik Alarm 4230 Channel %1 data alteration from external not possible in current channel state
%1 = Channel number
It is not allowed to enter this data while the part program is being executed (e.g. setting data for working area limitation or for dry run feedrate).
– Alarm display.
The data to be entered must be altered before starting the part program.
Clear alarm with the Delete key or NC START.
- Siemens Diagnostics Guide by Siemens