FANUC Alarm FXTL-026 — Invalid unit mapping file: T…

Manufacturer wording — Invalid unit mapping file: T%d
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC FXTL-026 (“Invalid unit mapping file: T…”): The unit cpu/group mapping file contains incorrect entries and could not be opened. First check: Check the error log and listing for more details about the specific error.

Updated 2026-09-17 · LogrobotLM reference

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 →