LogrobotLM

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 →

ABB Error 31114 — CPU main fault

Error

ABB 31114 (“CPU main fault”): VME backplane bus error when accessing the LED indicators on the main computer board. Likely part: CPU principal (CPU main).

Updated 2026-10-22 · LogrobotLM reference

What it means

VME backplane bus error when accessing the LED indicators on the main computer board.

What to check

  • Replace the main computer board.
  • Replace the robot I/O board.
  • Note: Hardware addressing fault specific to the S4-era VME bus.

Part to check / replace

ABB 31114 points to the hardware below — start here before ordering.

Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.

Related codes

31108Serial link RS232 fault31115Link console fault31226Floppy disk drive fault

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 →