61702

Access the part program and verify parameter declaration before CYCLE950 call. Check that at least one of _NP5, _NP6, or _NP7 is explicitly assigned a numeric value (e.g., _NP5=2.5, _NP6=1.0, _NP7=0.5).

Parameters must be declared in the same program block or earlier; they cannot be declared after CYCLE950 invocation.

If parameters are declared, verify their values are within valid range (typically positive values representing stock allowance in mm). Check for zero or negative values which may cause geometry calculation errors.

Negative offset values can cause undefined contour behavior in the finishing cycle.

Confirm parameter scope: _NP5, _NP6, _NP7 are local cycle parameters with scope limited to CYCLE950 execution. Verify they are not being overwritten by global machine data (MD) settings before cycle call.

Load the corrected part program and execute in DRY RUN mode (via MMC/HMI: Automatic → Dry Run) to verify parameter initialization without material removal.

Review the blank contour subroutine definition. Verify all line (L), arc (G2/G3), and transition elements form a closed, non-self-intersecting profile. Use the Siemens HMI Contour Editor (if available) to visualize the geometry.

Contours with open endpoints or overlapping segments will cause parsing failure in the NCK.

Check contour subroutine call syntax within CYCLE950. Confirm the reference uses correct M-code format (e.g., CONTOUR="MyProfile" or equivalent Siemens syntax). Verify subroutine name matches the defined contour exactly (case-sensitive).

Validate coordinate system orientation: blank contour must be defined in the XY-plane if using _NP5 (XY offset) or referenced correctly for rotated work planes. Check for improper plane selection (G17/G18/G19) that contradicts contour definition.

Plane misalignment will cause unintended material removal paths.

Test the contour definition independently by running a test cycle with minimal stock removal values (_NP5=0.1, _NP6=0.1) in a safe setup to verify parsing before full execution.

Verify the channel assignment in the HMI: Navigate to Machine Data → Channel Configuration (Kanal-Konfiguration) and confirm the active channel supports CYCLE950 (typically requires X, Y, Z axes with synchronized interpolation).

2.5-axis or single-plane channels may not support full blank contour finishing.

Check active tool offset (DL) and tool radius compensation (CRC) settings. Confirm DL is non-zero and CRC is properly configured (G41/G42) before CYCLE950 to prevent contour interpretation errors.

Missing or zero tool offset will cause incorrect blank contour offset calculation.