Siemens alarm 61605: Contour incorrectly programmed

What it means

The contour interpreter found an illegal relief-cut (undercut) element inside the described finished-part contour, so the cycle cannot traverse it. Documented for the contour-based turning cycles including CYCLE76, CYCLE77 and CYCLE95. Repair the contour description program.

Likely causes

• Unsupported G-code sequence inside the contour subroutine
• Relief-cut element placed at an invalid contour position
• Contour edited after generation leaving inconsistent elements