Before attempting resets, check the LEDs on the CCU card in the back panel:
Siemens 810d control stuck at Siemens boot screen - SiePortal sinumerik 810d waiting for nck connection
The "Waiting for NCK Connection" error on a typically indicates a communication breakdown between the HMI (Human-Machine Interface) and the NCK (Numerical Control Kernel). This often occurs during machine startup when the NCK fails to initialize or the communication link is interrupted. Common Causes Before attempting resets, check the LEDs on the
: Loose connections or incorrect DIP switch settings on the PCU (Panel Control Unit) can cause HMI-NCK handshake failures. Step-by-Step Troubleshooting Guide 1. Inspect Hardware LEDs Before attempting resets
: Faulty CCU cards, damaged power supplies, or failed PCMCIA memory cards can block the connection.