The SINUMERIK 810D control system is powered on but has not yet established communication with the NCK (Numerical Control Kernel). The NCK is the core unit responsible for axis control, interpolation, and machining functions.
: A common cause is a depleted backup battery. If the battery dies while the machine is off, the NCK loses its internal SRAM data, including machine parameters and PLC programs. Without this data, the NCK cannot boot into a state ready for communication. Communication Physical Link sinumerik 810d waiting for nck connection