Fanuc 0i Error Code 940

Fanuc CNC Critical System Alarm

Model: FANUC Series 0i / 0i Mate | Code: 940

Applicable Systems
Series 0i Series 16/18/21 Alpha Beta

Symptoms

A servo board function fault was detected.

Possible Causes

  • Servo board hardware failure or incompatibility.
  • Servo board not properly initialized.

Troubleshooting Steps

  1. Step 1: Check the servo board installation and connections.
    Board issue identified.
  2. Step 2: Replace the servo board if faulty.
    Servo board function restored.

How to Reset

Fix the servo board fault and reset to clear the alarm.

Source: Fanuc 0i/0iMate Alarm Code List, FANUC Corporation

Category: CNC