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Access HMI Service mode and navigate to Diagnosis -> Remote Diagnostics to check current connection status and buffer utilization.

Stop active remote diagnostics session via HMI: Service -> Remote Diagnostics -> Disconnect or use NC/PLC Stop.

This will terminate any active remote support connection. Coordinate with remote support team before disconnecting.

Clear diagnostic buffers by performing NCK Reset (Mode selector to 0, power cycle NCK via HMI Services or perform controlled restart).

NCK reset will abort any running programs and clear current modal states. Ensure machine is in safe state before proceeding.

Re-establish remote connection with reduced diagnostic data rate settings in Remote Diagnostics configuration (lower trace depth or sampling rate).

Check NCK memory utilization: HMI -> Diagnostics -> Memory -> NCK Memory Display. Document current usage percentages for dynamic and static memory.

Review active part program size and complexity. If programs exceed 500KB or contain extensive subroutine nesting, consider optimizing or splitting programs.

Check and reduce active trace configurations: Service -> Trace -> Review all active traces and disable non-essential traces consuming memory.

If memory consistently near capacity, contact Siemens to evaluate NCK memory upgrade options or adjust memory allocation via machine data MD18210 (user memory configuration).

Modifying machine data requires Siemens authorization and parameter backup. Incorrect settings can cause system instability.

Monitor system memory over time: After clearing alarm, document NCK free memory every 30 minutes via HMI Diagnostics to identify progressive memory loss pattern.

Check current NCK software version: HMI -> System -> Version. Compare against latest available service pack from Siemens for known memory leak fixes.

Disable remote diagnostics service completely if not required: Set machine data MD19300 $ON_REMOTE_DIAG = 0, save and perform NCK reset.

This permanently disables remote diagnostics functionality until re-enabled. Ensure local diagnostics capability is sufficient.

If issue persists, perform complete system reinitialization: Boot from CompactFlash, perform data backup, then restore system software. Contact Siemens support for software update package.

System reinitialization requires extended downtime and comprehensive backup of all machine data, part programs, and tool offsets. Perform only during scheduled maintenance.