Fanuc Alarm 404 SERVO ALARM: n–TH AXIS VRDY ON
Fanuc Servo Alarm Description
Even though the n–th axis (axis 1–8) READY signal (MCON) went off, the servo amplifier READY signal (DRDY) is still on. Or, when the power was turned on, DRDY went on even though MCON was off.
Check that the servo interface module and servo amp are connected.