LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free →

FANUC Alarm SRVO-387 — Softfloat impossible

Manufacturer wording — Softfloat impossible(G:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC SRVO-387 (“Softfloat impossible”): The position or schedule is not proper. First check: Use soft float in the proper position and schedule

Updated 2026-09-17 · LogrobotLM reference

Description

The position or schedule is not proper.

Remedy

Use soft float in the proper position and schedule

Related codes

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 →