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Open Siemens HMI Diagnostics > System Information > Axis List to verify all configured axes. Compare against the _MA parameter value in your measuring cycle call.

Ensure you are viewing the NCK configuration, not the PLC axis mapping layer.

Check MD10100 (axis/spindle general data) for each physical axis. Verify that the axis name in _MA matches exactly (case-sensitive) an entry configured in this parameter list.

Typos or whitespace differences (e.g., ' Z' vs 'Z') will cause the axis lookup to fail.

If the axis is new or was renamed, verify MD10110 (axis/spindle type) and MD10120 (interpolation mode) are set correctly for that axis. Restart NCK and retry the measuring cycle.

In Siemens program, explicitly pass a valid axis identifier to _MA (e.g., _MA='Z' or _MA=AX_Z depending on your machine parameter naming convention).

In your NC program, verify the _MA parameter assignment uses proper SINUMERIK syntax: _MA='<axisname>' (string literal in quotes). Check for NULL assignments or missing quotes.

Common error: _MA=Z (without quotes) will be interpreted as a numeric variable, not an axis name.

Use the Siemens Diagnostics > Program Editor to inspect the exact line where the measuring cycle is called. Look for _MA parameter and confirm it contains a valid axis name (typically single letter, e.g., 'X', 'Y', 'Z', or compound like 'A1').

Verify the axis name matches the naming convention defined in your machine's axis parameter list (MD10100). Some machines use 'AXIS_Z'; others use 'Z'. Align _MA to your machine's convention.

Rewrite the measuring cycle call with explicit _MA parameter and re-execute. Example: CYCLE983(_MA='Z', _PROBE=1, ...). Monitor alarm buffer for confirmation.

Navigate to Siemens HMI > Machine Data > Axis-Specific > MD30710 (Auxiliary axis type) and MD30720 (Auxiliary axis interpolation). Verify entries exist for your intended measuring axis.

Auxiliary axes require explicit machine data setup separate from primary axes. Verify MD10100 contains the auxiliary axis AND MD30700-series parameters are configured.

Cross-reference the _MA parameter in your measuring cycle against the auxiliary axis name in MD30700 (auxiliary axis data). They must match exactly.

If using CYCLE983, CYCLE984, or similar probe cycles with an auxiliary axis, confirm MD20050 (probe input assignment) maps the auxiliary axis correctly. Use Diagnostics > NCK State to verify axis binding.

Perform a full NCK reset and reload machine data (via HMI System > Machine Data > Load). Then retry the measuring cycle with _MA pointing to the properly configured auxiliary axis.