XML_TAGNEST

Tag nesting level too deep

Fanuc · R-30iA R-30iB Controller

What does XML_TAGNEST mean?

This fault occurs when the hierarchical nesting of XML tags in the file exceeds the maximum allowed depth for the parser. Deeply nested XML structures can consume excessive resources or violate internal processing limits, leading to parsing failure.

Common Causes

  • The XML file has a deeply nested structure where the hierarchy of tags exceeds the parser's limit.
  • Recursive or excessively complex XML design.
  • A malformed XML file creating an unintended deep nesting.
  • Software limitation on the maximum depth of XML tag nesting.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reduce the nesting depth of XML tags in the configuration file.

  2. 2

    Flatten the XML structure by refactoring element relationships.

  3. 3

    Ensure that tag nesting is logical and not unnecessarily deep.

  4. 4

    Review the XML file for any unintended recursive tag structures.

  5. 5

    Check parser documentation for the specific maximum tag nesting depth.

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Verified technical data. Last updated: March 2026

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Source: Fanuc R-30iA R-30iB Controller