What causes Siemens SINUMERIK alarm 61809?

Drill position programmed outside the allowable area for the active drilling pattern or cycle. Transformation (TRAORI, TRANSMIT) active but drill position is outside the transformation workspace. Pattern definition conflicts with machine kinematics — position cannot be reached with active tool orientation. Canned cycle parameter error placing the drill position outside limits. Rotary axis position conflict with the programmed drill location.

How do I fix Siemens SINUMERIK alarm 61809?

1. Review the drill position in the flagged block and verify it is within the allowed work area. 2. Check if any transformation (TRAORI, TRANSMIT, TRACYL) is active and whether the position is within the transformation workspace. 3. Verify the canned cycle parameters (depth, retract, peck) are consistent with the machine configuration. 4. If using 5-axis drilling, verify the tool orientation allows reaching the programmed position. 5. Cancel any active transformation temporarily and re-evaluate the drill position.

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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 61809

Siemens 840D 61809 - Channel Block: Drill position not permissible

Alarm 61809 occurs when the NCK attempts to position a drill or tool at a location that violates machine geometry constraints or active software limits. This is typically a servo-level validation failure where the calculated drill position exceeds permissible workspace boundaries defined in machine data or active G-code modal states.

Siemens SINUMERIKServo/AxisIntermediate30-120 minutes

61809

Siemens 840D 61809 - Channel Block: Drill position not permissible

Channel Block: Drill position not permissible

Root Cause Summary

Alarm 61809 occurs when the NCK attempts to position a drill or tool at a location that violates machine geometry constraints or active software limits. This is typically a servo-level validation failure where the calculated drill position exceeds permissible workspace boundaries defined in machine data or active G-code modal states.

Safety

Refer to Siemens documentation
Ensure qualified technician performs repairs

Causes and Fixes

1
In NCK menu, select Diagnostics > Parameters > Machine Data and verify MD10100 (Min Position Limit) and MD10200 (Max Position Limit) for the affected axis. Cross-reference with physical machine capability.
Do not modify limits without mechanical validation; incorrect values can mask genuine machine constraints.
2
Review the NC program block %2 in the active channel. Check the absolute drill coordinates (G90) or incremental positions (G91) and confirm they fall within the validated workspace envelope.
3
If limits are correct, check for tool length offset (MD14110 Tool Length Offset Enable) or workpiece offset (G54-G59) that may be shifting the effective drill position beyond limits. Inspect active offsets via Diagnostics > Variables > Offsets.

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