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FANUC Alarm PALL-121 — Could not read …

Manufacturer wording — Could not read %s
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC PALL-121 (“Could not read …”): Could not read the unitload.dt file. First check: Check the MOTET communication and PTPC status.

Updated 2026-09-17 · LogrobotLM reference

Description

Could not read the unitload.dt file. A Data error exists.

Remedy

Check the MOTET communication and PTPC status.

Related codes

PALL-118Cannot use MODIFYPALL-119Stn file not loaded or createdPALL-122Cannot go to DETAIL pagePALL-123Data modification disallowed

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 →