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Siemens SINUMERIK Controller
Servo/Axis · Advanced · 30-60 minutes
Siemens Alarm 2130 - Encoder Power Undervoltage
SINUMERIK alarm 2130 indicates the NCK has exhausted available SRAM memory during operation. This occurs when the combined memory requirements for part programs, tool data, machine parameters, and R-parameters exceed the physical SRAM capacity of the NCU unit.
2130
Siemens Alarm 2130 - Encoder Power Undervoltage
Encoder Supply Error
Siemens SINUMERIK alarm 2130: Encoder Supply Error. 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
SINUMERIK alarm 2130 indicates the NCK has exhausted available SRAM memory during operation. This occurs when the combined memory requirements for part programs, tool data, machine parameters, and R-parameters exceed the physical SRAM capacity of the NCU unit.
Safety
- Axis position may be unreliable
Causes and Fixes
- 1
Check Program Memory Usage
Navigate to HMI > Diagnostics > NCK > Memory and check 'Program Memory' usage percentage in SRAM allocation display.
Programs over 1MB should be stored on CompactFlash and called via EXTCALL
- 2
Remove Unused Programs
Go to HMI > Program Manager > NCK and delete unnecessary part programs from SRAM. Keep only active production programs.
Always backup programs to CompactFlash before deletion
- 3
Optimize Program Storage
Move large programs to CompactFlash via HMI > Program Manager and use EXTCALL function to execute from external memory.
Set MD11210 $MN_PROG_EVENT_MASK to optimize program loading behavior
Call a technician if:
- ·Memory hardware test failures
- ·Persistent corruption after NCK reset
- ·NCU hardware replacement needed
Prevention
- Regular memory usage monitoring via HMI diagnostics
- Implement program archiving procedures
- Set appropriate MD limits for tools and variables
- Use CompactFlash for large program storage
Common Mistakes
- Ignoring memory usage warnings
- Storing all programs in SRAM
- Not archiving old tool data
- Using excessive R-parameters unnecessarily
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