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Access Diagnostics > Software > NCK Information in HMI or via SINUMERIK Operate interface to verify NCK kernel version and build number.

Check compile cycle source code or metadata (typically in /user/cycles or /opt/sinumerik/cycles directory on control). Cross-reference the cycle's CCNCKInterface header version (usually embedded in *.h include files) against the running NCK version.

Do not attempt to manually edit cycle binary files; recompilation is required.

Obtain the compile cycle source code and recompile using the SINUMERIK Compile Cycle Workbench (or appropriate GCC/cross-compiler toolchain) configured for the current NCK kernel version.

Deploy the recompiled cycle library to the control via /user/cycles or specified cycle directory, then perform a warm restart (Ctrl+Alt+Delete or control power cycle) to reload NCK.

Enable NCK debug logging by setting MD parameter MD_LOAD_CYCLES_DEBUG = 1 (or equivalent in your SINUMERIK version). Check the NCK kernel log file (typically /var/log/sinumerik.log or via Diagnostics > Kernel Log) for specific unresolved symbol names.

Debug logging increases NCK CPU load; disable after diagnosis.

Cross-reference unresolved symbol names against the NCK kernel symbol export list, available via 'nm' command on the kernel binary or in SINUMERIK documentation for your NCK version. Verify the cycle source code uses only officially supported API functions.

If custom cycle source is available, relink the cycle using the correct NCK linker script and library stubs (libSinumerikNCK.a or equivalent) provided in the SINUMERIK SDK for your kernel version.

If source is unavailable, contact cycle vendor to obtain a rebuild compiled against your specific NCK kernel version, or replace with a factory-certified cycle from Siemens.

Verify the compile cycle file exists and is readable: use 'ls -la' command on the control (SSH/terminal) to list files in the configured cycle directory and check file size and timestamp.

Ensure you have appropriate user permissions (typically 'sinumerik' user or root).

Perform a binary checksum validation (MD5 or SHA256) on the cycle file against the known-good checksum provided by the cycle vendor or in the deployment documentation.

If checksum fails or file is corrupted, delete the cycle file and re-deploy from a verified source (USB stick, network share, or vendor distribution media). Ensure transfer completes without errors.

Perform a warm restart to reload NCK and re-initialize the cycle loader. Monitor the Diagnostics > Kernel Log for successful cycle load confirmation.