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Siemens SINUMERIK Controller
Program/G-code · Intermediate · 30-120 minutes
Siemens 840D 101626 - Unknown unit.
Alarm 101626 occurs when the NC program contains a measurement unit specification that the control system does not recognize or support. This typically happens when programming feed rates, dimensions, or coordinates with incorrect or unsupported unit identifiers in the G-code.
101626
Siemens 840D 101626 - Unknown unit.
Unknown unit.
Siemens SINUMERIK operator message 101626: Unknown unit. 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 101626 occurs when the NC program contains a measurement unit specification that the control system does not recognize or support. This typically happens when programming feed rates, dimensions, or coordinates with incorrect or unsupported unit identifiers in the G-code.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Identify the exact block number where the alarm occurred and examine the NC program line for any unit specifications (check for unusual F, S, or dimension value suffixes).
- 2
Verify that only standard unit codes are used: G70 (inch) or G71 (metric), and ensure feed rates use standard formats without custom unit suffixes.
- 3
Check machine data MD10240 (SCALING_SYSTEM_IS_METRIC) to confirm the expected base unit system and ensure program units match.
- 4
Correct the program by removing invalid unit identifiers or converting to standard SINUMERIK unit formats, then reset the alarm and restart the program.
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