Fanuc 0i Error Code 091

Fanuc CNC Major P/S Alarm

Model: FANUC Series 0i / 0i Mate | Code: 091

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

Symptoms

A ready signal error was detected on the FSSB. Alarm 091 is displayed on the CNC screen.

Possible Causes

  • Programming error in the CNC part program
  • Incorrect G/M code usage
  • Parameter or offset data invalid
  • Program format or syntax error

Troubleshooting Steps

  1. Step 1: Check the CNC alarm screen for alarm 091 details
    Alarm message displayed with cause description
  2. Step 2: Review the CNC part program for the block that caused the alarm
    The problematic block is identified
  3. Step 3: Correct the program, parameter, or offset data as indicated
    The corrected value is accepted without error
  4. Step 4: Press RESET to clear the alarm and re-run the program
    Alarm clears and program runs without error

How to Reset

Press the RESET key on the CNC operator panel to clear the alarm after correcting the cause.

Frequently Asked Questions

  • Q: What does Fanuc alarm 091 mean?

    FSSB Ready Error: A ready signal error was detected on the FSSB.

  • Q: How do I clear Fanuc alarm 091?

    Correct the underlying cause (usually a program or parameter error), then press RESET on the CNC operator panel to clear the alarm.

Related Fanuc Fault Codes

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

Category: CNC