Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Advanced · 1-3 hours

Alarm 27093

Siemens 840D 27093 - Checksum error NCK-SPL,,

A checksum error has occurred in the NCK SPL. The file /_N_CST_DIR/_N_SAFE_SPF was subsequently modified. The safe programmable logic (SPL) in the NCK may be corrupted. Parameter indicates the type of modification: - = FILE_LENGTH: the file length has changed. - = FILE_CONTENT: the file con

Siemens SINUMERIKServo/AxisAdvanced1-3 hours

27093

Siemens 840D 27093 - Checksum error NCK-SPL,,

Checksum error NCK-SPL,,

A checksum error has occurred in the NCK SPL. The file /_N_CST_DIR/_N_SAFE_SPF was subsequently modified. The safe programmable logic (SPL) in the NCK may be corrupted. Parameter indicates the type of modification: - = FILE_LENGTH: the file length has changed. - = FILE_CONTENT: the file con

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Unsafe shutdown or power loss during NCK parameter writing or system update
  • Corrupted safe programmable logic (SPL) file in /_N_CST_DIR/_N_SAFE_SPF due to incomplete upload or transmission error
  • Memory degradation or defective flash memory in the NCK module
  • Interrupted or failed firmware update process affecting safety-critical files

Troubleshooting Steps

  1. 1Document the %1 parameter value (FILE_LENGTH or FILE_CONTENT) and all %2, %3 values displayed in the alarm to identify the specific corruption type
  2. 2Power cycle the control with a clean shutdown procedure; if the alarm persists, the corruption is permanent and requires file restoration
  3. 3Backup current machine data and parameters, then attempt to reload the NCK firmware and safety files from the original Siemens source media or backup
  4. 4If reload fails, verify NCK module hardware health and check for loose connections; consider replacing the NCK module if memory errors are detected
  5. 5Contact Siemens service or use authorized diagnostics to validate checksum integrity and restore /_N_SAFE_SPF file from a known-good backup

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