FANUC Alarm FRCE-494 — Illegal initial Fd (F:…)

Manufacturer wording — Illegal initial Fd (F:%d^1)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC FRCE-494 (“Illegal initial Fd (F:…)”): The sign of 'Initial Insert Force' in Performance Data is different from the sign of 'Insert Force'. First check: Make the sign of 'Initial Insert Force' in Performance Data the same as the sign of 'Insert Force'.

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 →