FANUC Alarm PRIO-178 — WARN Blk scns lost; … … …
Manufacturer wording — WARN Blk scns lost; %d %d %d
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC PRIO-178 (“WARN Blk scns lost; … … …”): A group of consecutive scans were lost; if n1=1, scans were lost on the main processor; if n1 = 2, scans were lost on the communications processor; n2 = number of lost scans; if n2 is less than 5, thi First check: Review software configuration to determine how loading can be reduced.
Updated 2026-09-17 · LogrobotLM reference
Description
A group of consecutive scans were lost; if n1=1, scans were lost on the main processor; if n1 = 2, scans were lost on the communications processor; n2 = number of lost scans; if n2 is less than 5, this may not be a serious problem; n3 = total scans since pwr up since power-up. Generally indicates overloading of the indicated processor.
Remedy
Review software configuration to determine how loading can be reduced.
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 →