[Al Skierkiewicz]

The Crio has a voltage brownout mode where all outputs are disabled. This occurs when the battery is about 5.5 volts and it sensed through the jumper you must add to the analog module in slot 1. This is performed in anticipation of the battery falling to the point at which the 24 volt power supply becomes unstable. Should the battery voltage fall below 4.5 volts the Crio may reboot.