Table 16. SD In Use LED Indicator
LED LED Color LED Pattern Indication
SD IN USE Green Off There is no SD card present in the slot or the
cRIO-904x has unmounted the SD card from the
operating system. It is safe to remove the SD card
from the slot.
Solid The SD card in the slot is mounted in the operating
system. Do not remove the SD card while this LED
is lit.
Chassis Grounding Screw
The cRIO-904x provides a chassis grounding screw.
Figure 5. cRIO-904x Chassis Grounding Screw
1. Chassis Grounding Screw
For information about grounding the cRIO-904
x, see "Grounding the Controller" in the
cRIO-904x Getting Started Guide.
For more information about ground connections, visit ni.com/info and enter the Info Code
emcground.
Internal Real-Time Clock
The cRIO-904x contains an internal real-time clock that maintains system time when the
cRIO-904x is powered off. The system clock of the cRIO-904x is synchronized with the
internal real-time clock at startup. You can set the real-time clock using the BIOS setup utility
or MAX, or you can set the real-time clock programmatically using LabVIEW.
18 | ni.com | cRIO-904x User Manual
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