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FANUC Alarm SYST-155 — ABC overrun

FANUC SYST-155 (“ABC overrun”): ARM Bending Control function cannot get enough MPU power. First check: Reduce some software options or disable some motion groups which had previously been enabled, and then try the operation again.

Updated 2026-09-17 · LogrobotLM reference

Description

ARM Bending Control function cannot get enough MPU power.

Remedy

Reduce some software options or disable some motion groups which had previously been enabled, and then try the operation again.

Related codes

SYST-153WARN Cannot SIM/UNSIM DO’s in AUTO modeSYST-154WARN No start in ISOLATE/BYPASS modeSYST-156SYSTEM Unknown hard wareSYST-157SYSTEM CE/RIA software does not exist

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 →