Sometimes, the machine just gets "confused" during the boot sequence. The PLC starts, the HMI starts, but the NCK hangs.
: Software glitches or improper shutdowns can corrupt NC/PLC files, preventing the system from booting correctly. sinumerik 810d waiting for nck connection
The HMI and NCK communicate via the Multi-Point Interface (MPI) or Profibus. This is a round, purple cable that acts as the nervous system. If this cable is loose, corroded, or if a mouse has chewed through it behind the cabinet, the handshake fails. Sometimes, the machine just gets "confused" during the