6700

Access machine data via Siemens HMI or NCK Diagnostics menu. Navigate to: Diagnostics > Machine Data > Category 'Protocol' or search MD number directly.

Do not modify machine data while active cycles are running or during tool change sequences.

Locate $MC_MM_PROTOC_NUM_ETP_STD_TYP and document the current value (typical default range 50-200 depending on control software version).

Review all active DIN 66025 protocol definitions and custom event type registrations in the part program or PLC program blocks. Count total unique event types being referenced across all protocol instances.

Check for protocol definitions in _N_*_MPF or _N_*_SPF files and custom M-function handlers that may register additional event types.

Increase $MC_MM_PROTOC_NUM_ETP_STD_TYP to a value 20-30% higher than the documented event type count. Save configuration and perform a warm restart (Ctrl+Shift+R) or full NCK reboot.

Excessive increases may consume unnecessary NCK memory; recommended maximum is typically 500 unless explicitly required by application documentation.

Enable protocol diagnostics logging via Diagnostics > System Information > Protocol Status or check NCK trace files (/log/nck_trace.txt) for event type registration failures preceding alarm 6700.

Enabling full protocol tracing may degrade real-time performance; use only during diagnosis and disable afterward.

Review PLC program OB40 (protocol initialization block) and any custom protocol modules to identify dynamic event type registration calls. Search for keywords: 'DPROT_ADD_EVENT', 'REGISTER_EVENT', or protocol configuration structures.

Verify that protocol gateway configurations (if using external protocol servers or OPC-UA) do not exceed resource limits defined in the NCK configuration file (typically found in /system/nck/config.xml or similar).

Increase $MC_MM_PROTOC_NUM_ETP_STD_TYP incrementally (in steps of 50) while monitoring memory usage via Diagnostics > Memory Management. Retest after each adjustment.

Monitor available NCK memory to prevent 'out of memory' alarms; refer to $MEM_NCK_FREE machine data.

Verify SINUMERIK software version and control type: Diagnostics > System Information > Software Version. Compare against documentation for the machine data configuration requirements specific to that version.

If a machine data restore was recently performed, compare the current $MC_MM_PROTOC_NUM_ETP_STD_TYP value against Siemens default parameter recommendations for your control version (check reference documentation or contact Siemens support).

Reset $MC_MM_PROTOC_NUM_ETP_STD_TYP to factory default by deleting the custom value and allowing the NCK to re-initialize with vendor defaults. Alternatively, restore from a known-good machine data backup from the same control version.

Always create a backup of current machine data before performing reset operations.