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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 840D 6600 - NC card memory is full
Alarm 6600 indicates the NCK (Numerical Control Kernel) card file system has exhausted available storage capacity, preventing new part programs, tool offsets, or diagnostic data from being written. This typically occurs due to accumulated log files, diagnostic traces, or oversized part programs consuming the limited flash memory on the NC card.
Siemens 840D 6600 - NC card memory is full
NC card memory is full
Siemens SINUMERIK alarm 6600: NC card memory is full. This alarm indicates a fault or error condition on the SINUMERIK 840D control. Refer to the Siemens SINUMERIK alarm documentation for the complete description and remedy.
Root Cause Summary
Alarm 6600 indicates the NCK (Numerical Control Kernel) card file system has exhausted available storage capacity, preventing new part programs, tool offsets, or diagnostic data from being written. This typically occurs due to accumulated log files, diagnostic traces, or oversized part programs consuming the limited flash memory on the NC card.
Safety
Causes and Fixes
Access NCK Diagnostics menu: Press [Diagnostics] > [Trace] > [Trace Memory]. Document current trace buffer utilization percentage.
Stop all active programs and disable diagnostic tracing by setting MD 11000 (DIAG_TRACE_ON) = 0 via HMI parameterization menu or Siemens SCOUT TIA Portal offline editor.
Disabling tracing will halt real-time diagnostic capture; enable only when troubleshooting specific faults.
Clear NCK trace memory: Navigate to [System] > [Memory Management] > [Delete Diagnostic Files]. Confirm deletion of all .tdx and .log files to recover 100-500MB of storage.
Verify free space via [System] > [Memory] > [Storage Status]. Confirm available capacity exceeds 20% of total NC card size before resuming production.
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