Sinumerik Alarm 28012 NCU link: synchronization cycle signal failure %1 times
%1 = Number of cycles
Error message of the NCU link module that does not occur at NCU 1. The NCU’s are synchronized via their own NCU-link clock line. A large number of cycle signals are missing. The parameter indicates how many cycles have failed.
– Alarm display.
– Interface signals are set.
– NC not ready.
– Channel not ready.
– NC Start disable in this channel.
– NC Stop on alarm.
Check the hardware.
Switch control OFF – ON.
- Siemens Diagnostics Guide by Siemens