4000
Internal error
Beckhoff · TwinCAT 2 NC
What does 4000 mean?
An internal system error has occurred within the NC on ring 0, indicating an unexpected software fault without further specific details. This type of error can lead to system instability, unexpected halts in operation, and potentially data corruption if not resolved, as it affects the core NC processing.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Ensure all NC software components and firmware are up to date.
- 4
If the error persists after restart, gather system logs and contact technical support.
Source: Beckhoff TwinCAT 2 NC
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