What are Fanuc Alarms ?

Fanuc alarms are essentially the FANUC CNC producing errors due to hardware, software faults or the execution of programs. There are many different alarms produced on the many series of Fanuc controls from the late 1970’s to current drives and controls.

System Alarms
Drive Alarms Servo, Spindle and PSM
Pulse coder (Absolute APC) & (Serial SPC) alarms
Overtravel alarms (OT)
Overheat alarms (OH)
Program errors (P/S alarm)

How are Fanuc Alarm Codes & Errors listed ?

Being involved with Fanuc for decades we have always thought better to list SYSTEMS, drives, then function errors which can be illegal program codes, etc.

Below is a fanuc alarm codes list by drives and system. As well plan to do servo alarms by Fanuc fault codes on the servo and the control systems.

Fanuc Drives & ALPHA module alarms:

Fanuc System alarms:

Error codes and alarms produced on Fanuc amplifiers, system, power supply units and modules, I/O racks operating the PLC side of the CNC are extensive. They do take time to understand and unfortunately our lists will never negate the need for a quality CNC maintanence engineer to visit site and diagnose and solve faults on your machine(s).