Sinumerik Alarm 28031 Serious alarm on NCU %1 not yet acknowledged, axes still in follow-up mode
%1 = NCU number
A serious alarm was not yet acknowledged on another NCU. Consequently, all the axes continue to trail.
– Alarm display.
– Interface signals are set.
– NC not ready.
– Mode group not ready, also effective for single axes
– NC Start disable in this channel.
– NC Stop on alarm.
Acknowledge the alarm on the NCU.
Alarm display showing cause of alarm disappears. No further operator action
- Siemens Diagnostics Guide by Siemens