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Access Diagnostics > Hardware > Network > PROFINET to verify connection status and frame error counters. Check for excessive CRC errors or frame loss on safety-capable network interfaces.

Do not proceed with machine operation if persistent PROFINET errors are detected.

In NCK Parameters (MD menu path: Axis > Safety > MD30300 to MD30320), verify F-parameter assignment and safety function block integrity. Confirm MD30300 (SafetyFunction_Enable) matches the configured F-block count.

Perform a full safety function block recompile and reload via HMI: Utilities > NCK > Safety > Reload Safety Configuration. Reboot the control after completion.

If error persists, check PROFINET cable integrity and re-seat all connectors. Perform a factory reset of the safety I/O modules and reconfigure via the PROFINET configuration tool.

Navigate to Diagnostics > NCK > Parameters > Safety and compare active F-block count against configuration. Verify MD30310 (SafetyFunction_Count) matches the number of instantiated safety functions in the NC program.

In the PLC editor, open the safety data block (typically DB_Safety or equivalent) and cross-reference F-parameter declarations with NCK MD30300-MD30320 range settings. Ensure axis safety assignments (MD31100 series) match between PLC and NCK.

Recompile all NC safety programs and PLC safety blocks together. Use the integrated compile function: Program > Compile All, then verify 'Compilation Successful' message without warnings.

Clear the diagnostic buffer (Diagnostics > Clear All) and perform a controlled power cycle (clean shutdown, 30-second wait, restart).

Check PLC cycle time in the PLC runtime diagnostics: Diagnostics > PLC > Cycle Time. Ensure current cycle time does not exceed configured max cycle time (typically MD10050 or PLC task settings). If exceeded, optimize PLC program or increase cycle time allocation.

Increasing cycle time may degrade safety response; consult Siemens safety documentation.

Review the PLC safety program for logic errors or infinite loops. In the PLC editor, verify all F-block calls complete within one cycle and that no conditional branches prevent F-block execution on every cycle.

Check MD10100 (SafetyHandshake_Timeout) and adjust if necessary (typical range: 50-200ms). Verify this value is greater than PLC cycle time plus NCK safety processing time (usually <5ms).

If error persists, perform a warm restart of the PLC: Diagnostics > PLC > Restart. Monitor the alarm log for recurrence over the next 5 machine cycles.