This read-only display string reports the state of the Very Low Voltage alarm for the Dc1 plant, sourced from the VLA1 alarm point. It signals that the plant's DC bus voltage has dropped to a critically low level, a severe condition beyond a routine low-voltage warning. For example, an admin seeing this alarm active together with a battery-on-discharge indication would recognize the batteries are nearing full depletion and act urgently to restore AC power.