Nck Connection: Sinumerik 810d Waiting For

The NCU contains an SRAM memory module holding the PLC (Programmable Logic Controller) code, machine parameters, and axis compensation data. This memory is maintained by a lithium battery when the main power is off.

On the CCU, check if the red "SF" (System Fault) or "PS/PF" LEDs are lit, which indicates a PLC or hardware error. sinumerik 810d waiting for nck connection