SINUMERIK 810D waiting for NCK connection
The error "Waiting for NCK connection" appears strictly at . The HMI has given up waiting for a response from the NCK after a pre-defined timeout period (typically 30–90 seconds). This means the NCK is either non-existent from the HMI’s perspective, crashed, stuck in a boot loop, or physically disconnected.
While many causes can be fixed in-house, some scenarios require professional intervention:
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