STATUS LED Indicators
Table 11. STATUS LED Indicators
LED Pattern Indication
Blinks twice and
pauses
The cRIO-905x is in safe mode. Software is not installed, which is the
factory default state, or software has been improperly installed on the
cRIO-905x. An error can occur when an attempt to upgrade the
software is interrupted. Reinstall software on the cRIO-905x. Refer to
the Measurement & Automation Explorer (MAX) Help for information
about installing software on the cRIO-905x.
Blinks three times
and pauses
The cRIO-905x is in user-directed safe mode, or the cRIO-905x is in
install mode to indicate that software is currently being installed. This
pattern may also indicate that the user has forced the cRIO-905x to
boot into safe mode by pressing the reset button for longer than five
seconds or by enabling safe mode in MAX. Refer to the Measurement
& Automation Explorer (MAX) Help for information about safe mode.
Blinks four times
and pauses
The cRIO-905x is in safe mode. The software has crashed twice
without rebooting or cycling power between crashes.
Continuously blinks The cRIO-905x has not booted into NI Linux Real-Time. The
cRIO-905x either booted into an unsupported operating system, was
interrupted during the boot process, or detected an unrecoverable
software error. If the problem persists, contact NI for support.
On momentarily The cRIO-905x is booting. No action required.
Off The cRIO-905x is in run mode. Software is installed and the operating
system is running.
User LEDs
You can define the behavior of the USER1 LED and the USER FPGA1 LED to meet the needs
of your application.
12 | ni.com | NI cRIO-905x User Manual
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