61408

Access Siemens HMI → Diagnostics → Machine Data → search MD 18080 (Total Offset Machine Data).

Verify current value of MD 18080. Check Bit 8 status (bit weighting: Bit 0=1, Bit 1=2, Bit 2=4, Bit 8=256). If value mod 512 is less than 256, Bit 8 is disabled.

Do not modify machine data while NC program is running or in automatic cycle mode.

Set MD 18080 Bit 8 = 1 by adding 256 to the current MD 18080 value (if Bit 8 is currently 0). Save configuration and warm restart NC kernel.

Re-execute the measuring cycle block %2 in channel %1 to verify alarm 61408 is cleared.

Review NC part program: locate the measuring cycle block %2 that triggered alarm 61408 in channel %1.

Verify that offset initialization code (typically SETZERO or offset preset blocks) executes before the first MEAS/MEASA/MEASW call. Check if _PROBE_OFFSET_ENABLED system variable is initialized.

Add offset initialization block before measuring cycle: execute a probe offset preset or SETZERO block to populate total offset memory in the NCK.

Recompile NC program and re-run measuring cycle to confirm offset dataset is now present.

Access HMI → Offsets → Tool Offsets (or SDT menu). Verify that the tool/probe offset entry referenced in measuring cycle block %2 contains valid probe geometry and length offset values.

Confirm probe offset table (DM form 61) includes calibrated X, Y, Z offset values for the active measuring tool. Offset values must not be zero or undefined.

Undefined or zero probe offsets will prevent total offset calculation and trigger 61408.

If offset entry is missing or blank, perform probe calibration cycle (CALIB or CALIBRATE) to populate tool offset memory with valid probe geometry data.

Re-execute measuring cycle block %2 after offset table is populated with valid probe offset data.