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FANUC Alarm XMLF-004 — Invalid character in tag

FANUC XMLF-004 (“Invalid character in tag”): Tag names cannot contain special characters such as &, <, >, /, ", or ". First check: Do not use special characters in tag names.

Updated 2026-09-17 · LogrobotLM reference

Description

Tag names cannot contain special characters such as &, <, >, /, ", or ".

Remedy

Do not use special characters in tag names.

Related codes

XMLF-002Attribute too longXMLF-003Invalid use of / characterXMLF-005No value for attributeXMLF-006End tag with no matching start

Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →