Table 20. SD LED Indicators (Continued)
LED
LED Color LED Pattern
Indication
SD IN USE
Green
Off
There is no SD card present in the slot or the
cRIO-9031 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-9031 provides a chassis grounding screw.
Figure 6. cRIO-9031 Chassis Grounding Screw
1
1. Chassis Grounding Screw
For EMC compliance, you must connect the cRIO-9031 to earth ground through the chassis
ground screw. Use wire that is 1.31 mm
2
(16 AWG) solid copper wire with a maximum length
of 1.5 m (5 ft). Attach the wire to the earth ground of the electrode system of the facility.
Caution
If you use shielded cabling to connect to a C Series module with a plastic
connector, you must attach the cable shield to the chassis grounding terminal using
1.31 mm
2
(16 AWG) or larger wire. Attach a ring lug to the wire and attach the wire
to the chassis grounding terminal. Solder the other end of the wire to the cable
shield. Use shorter wire for better EMC performance.
For more information about ground connections, visit
emcground
.
Internal Real-Time Clock
The cRIO-9031 contains an internal real-time clock that maintains system time when the
cRIO-9031 is powered off. The system clock of the cRIO-9031 is synchronized with the
20
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NI cRIO-9031 User Manual
