Sinumerik 810d Waiting For Nck Connection ((top)) -

The message "" (or Alarm 120202) on a Sinumerik 810D indicates that the Human-Machine Interface (HMI) cannot communicate with the Numerical Control Kernel (NCK) . This is most frequently caused by a loss of internal memory data on the Compact Control Unit (CCU) due to a dead backup battery or an extended period of machine power-down. Common Causes

If the machine was powered down for an extended period, the backup battery may have died, causing the CCU to lose its configuration and PLC data. sinumerik 810d waiting for nck connection

Loose cables (especially Profibus or MPI connections), faulty CCU modules, or seated "child cards" that have vibrated loose can disrupt the connection. The message "" (or Alarm 120202) on a

She checked the obvious:

For a CNC machinist, those four words are the digital equivalent of a flatline. faulty CCU modules