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FANUC Alarm SYST-277 — BMON update failed

FANUC SYST-277 (“BMON update failed”): An automatic update of BMON failed for some reason. First check: Refer to the error cause code in the Alarm history for a specific reason.

Updated 2026-09-17 · LogrobotLM reference

Description

An automatic update of BMON failed for some reason.

Remedy

Refer to the error cause code in the Alarm history for a specific reason. Manually update BMON at Configuration start according to the instruction in the Software Installation Manual.

Related codes

SYST-271Lack of MC for savingSYST-272Lack of USB for savingSYST-278DCS File is lostSYST-280Operating panel is Teach mode[P]

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 →