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Siemens SINUMERIK Controller
Servo/Axis · Intermediate · 30-120 minutes
Siemens 840D 61810 - Channel Block: ISO G code not possible
Alarm 61810 fires when the NCK interpreter encounters an ISO axis name in the active block that does not exist in the machine's axis configuration or is not properly mapped in the channel's geometry. This occurs during G-code parsing before servo execution, indicating a mismatch between programmed axis nomenclature and the machine definition in the SINUMERIK 840D control.
61810
Siemens 840D 61810 - Channel Block: ISO G code not possible
Channel Block: ISO G code not possible
Siemens SINUMERIK alarm 61810: Channel Block: ISO G code not possible. 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 61810 fires when the NCK interpreter encounters an ISO axis name in the active block that does not exist in the machine's axis configuration or is not properly mapped in the channel's geometry. This occurs during G-code parsing before servo execution, indicating a mismatch between programmed axis nomenclature and the machine definition in the SINUMERIK 840D control.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
In the SINUMERIK 840D Operator Panel, navigate to Diagnostics > Parameters > Machine Data and filter by MD 20050 (Axisname) for the affected channel. Verify all ISO axis names match those programmed in the G-code.
Do not modify MD 20050 while a program is running; request spindle stop and channel reset first.
- 2
Cross-reference MD 20080 (GeometryAxisAssign) to confirm each ISO axis is mapped to a valid configured axis. Verify the geometry block assignments align with the channel's kinematic structure.
- 3
Review the NC program listing in the Program Editor (NCK > Program > Load) and confirm the axis designators match the machine's configured names exactly (case-sensitive in some SINUMERIK variants).
- 4
If axis names are correct, perform a warm restart (Control Panel > Reset > Warm Restart) to force NCK re-initialization of the axis configuration tables.
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