Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 30-60 minutes

Alarm 61420

Siemens 840D 61420 - Channel block: Check calibration of multi/mono probes.

The alarm can be triggered by the following measuring cycles: CYCLE974, CYCLE994, CYCLE977, CYCLE978, CYCLE979, CYCLE997, CYCLE998 Remedy: The workpiece probe must be calibrated according to its type and use.

Siemens SINUMERIKServo/AxisIntermediate30-60 minutes

61420

Siemens 840D 61420 - Channel block: Check calibration of multi/mono probes.

Channel block: Check calibration of multi/mono probes.

The alarm can be triggered by the following measuring cycles: CYCLE974, CYCLE994, CYCLE977, CYCLE978, CYCLE979, CYCLE997, CYCLE998 Remedy: The workpiece probe must be calibrated according to its type and use.

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Workpiece probe has not been calibrated or calibration data is outdated
  • Probe calibration values do not match the actual probe type installed
  • Probe worn or damaged, requiring recalibration or replacement
  • Incorrect probe configuration parameters in the measuring cycle setup
  • Probe signal integrity issue preventing accurate calibration data capture

Troubleshooting Steps

  1. 1Verify the probe type installed matches the probe type specified in the measuring cycle parameters; consult machine documentation for correct probe identification
  2. 2Execute the probe calibration routine appropriate for your probe type (mono or multi-probe) using the machine's calibration wizard or manual calibration procedure
  3. 3Inspect probe tip for wear, damage, or contamination; clean or replace probe if mechanical damage is visible
  4. 4Confirm calibration data has been saved to the correct NC parameter location and that the measuring cycle is referencing the correct calibration data
  5. 5Test probe functionality with a simple trigger test before re-running the measuring cycle to confirm signal response

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Always verify with your machine manual or a certified technician before performing service procedures.