Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-45 minutes

Alarm 61278

Siemens 840D 61278 - Channel block: If tool angle is larger than 90°, both tool diameters

For tool angles larger than 90°, the two tool diameters must be identical. Alarm triggered by following cycle: CYCLE61.

Siemens SINUMERIKServo/AxisIntermediate20-45 minutes

61278

Siemens 840D 61278 - Channel block: If tool angle is larger than 90°, both tool diameters

Channel block: If tool angle is larger than 90°, both tool diameters

For tool angles larger than 90°, the two tool diameters must be identical. Alarm triggered by following cycle: CYCLE61.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Tool angle configured greater than 90° with mismatched tool diameters in CYCLE61
  • Incorrect tool geometry parameters entered during tool offset setup
  • Tool table contains different diameter values for primary and secondary cutting edges on the same tool
  • CYCLE61 cycle parameters referencing wrong tool or tool offset number

Troubleshooting Steps

  1. 1Verify tool angle specification in the CYCLE61 call - if angle exceeds 90°, both tool diameters must be equal; adjust tool angle to ≤90° or modify tool geometry
  2. 2Check tool offset table and confirm both tool diameter values (D1 and D2) are identical for the tool referenced in the alarm
  3. 3Review CYCLE61 block syntax in the NC program - confirm correct tool offset numbers are specified and match the physical tool setup
  4. 4Measure actual tool diameters with calipers and update tool table to ensure both cutting edges match within tolerance if tool angle must remain >90°
  5. 5Test CYCLE61 execution with a tool angle ≤90° to isolate whether the issue is angle-dependent or a general tool offset error

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