Table 14. STATUS LED Indicators
LED
Color
LED Pattern Indication
Yellow Blinks twice and
pauses
The cRIO-904x is in safe mode. Software is not installed,
which is the factory default state, or software has been
improperly installed on the cRIO-904x.
An error can occur when an attempt to upgrade the software
is interrupted. Reinstall software on the cRIO-904x. Refer to
"Installing Software on the Controller" in the cRIO-904x
Getting Started Guide for information about installing
software on the cRIO-904x.
Blinks three times
and pauses
The cRIO-904x is in user-directed safe mode, or the
cRIO-904x is in install mode to indicate that software is
currently being installed.
This pattern may also indicate that the user has forced the
cRIO-904x 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 RESET Button for information about
safe mode.
Blinks four times
and pauses
The cRIO-904x is in safe mode. The software has crashed
twice without rebooting or cycling power between crashes.
Continuously
blinks
The cRIO-904x has not booted into NI Linux Real-Time.
The cRIO-904x either booted into an unsupported operating
system, was interrupted during the boot process, or detected
an unrecoverable software error.
On momentarily The cRIO-904x is booting. No action required.
16 | ni.com | cRIO-904x User Manual
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