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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 104248 - Error on reading monitoring data
Alarm 104248 indicates the CNC control system cannot properly read monitoring data from the configured monitoring channels or storage locations. This typically occurs due to corrupted monitoring configuration files, invalid monitoring data buffer access, or communication errors between the NCK and monitoring data storage areas.
104248
Siemens 840D 104248 - Error on reading monitoring data
Error on reading monitoring data
Siemens SINUMERIK alarm 104248: Error on reading monitoring data. This alarm indicates an error condition in the NC program or control configuration that must be resolved before the operation can continue.
Root Cause Summary
Alarm 104248 indicates the CNC control system cannot properly read monitoring data from the configured monitoring channels or storage locations. This typically occurs due to corrupted monitoring configuration files, invalid monitoring data buffer access, or communication errors between the NCK and monitoring data storage areas.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Navigate to HMI Diagnostics > Service > Monitoring and check which monitoring channels are active and their configuration status.
- 2
Perform a power cycle of the NCK (NC kernel) to reinitialize the monitoring data buffers. Document all active monitoring settings before reboot.
Ensure no production program is running and coordinate with production supervisor before NCK restart.
- 3
Check the NC user memory and work memory utilization via Diagnostics > NCK Memory. If utilization exceeds 85%, archive or delete old monitoring data files from the NC memory.
- 4
Restore monitoring configuration from a known-good backup using 'Archive System Data' function, or reconfigure monitoring channels manually via commissioning settings.
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Always verify with your machine manual or a certified technician before performing service procedures.