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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 100852 - Notice: Active memory statistics are reducing performance
Alarm 100852 indicates that the active memory statistics feature is enabled and consuming system resources, which reduces overall CNC performance. This is typically a configuration issue where memory monitoring was left enabled for diagnostic purposes but is now impacting cycle times and system responsiveness.
100852
Siemens 840D 100852 - Notice: Active memory statistics are reducing performance
Notice: Active memory statistics are reducing performance
Siemens SINUMERIK operator message 100852: Notice: Active memory statistics are reducing performance. This is an informational message from the SINUMERIK control indicating a system status or operation result that may require operator action.
Root Cause Summary
Alarm 100852 indicates that the active memory statistics feature is enabled and consuming system resources, which reduces overall CNC performance. This is typically a configuration issue where memory monitoring was left enabled for diagnostic purposes but is now impacting cycle times and system responsiveness.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access the HMI in Service mode and navigate to Commissioning > System Data > General Machine Data.
- 2
Locate machine data MD11460 $MN_NCK_MEMORY_STATISTICS and verify its current value. If set to 1 (enabled), this is causing the alarm.
- 3
Set MD11460 $MN_NCK_MEMORY_STATISTICS = 0 to disable memory statistics monitoring.
This change requires a complete NCK restart (Power Off) to take effect.
- 4
Perform a full controller power cycle (not just NCK reset). Verify alarm clears and monitor system performance improvement.
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