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Chapter 1 Getting Started with the cDAQ Controller
Caution You must use the SD card slot cover to protect the SD card in hazardous
locations.
Caution Do not insert or remove SD cards unless power has been switched off or
the area is known to be nonhazardous.
Note NI recommends that you primarily log data to the SD card when logging data.
Note Using SD cards that are not approved by NI might invalidate specifications
and result in unreliable performance.
SD Card LEDs
The cDAQ controller has two LEDs that indicate SD card drive mount status and activity. Refer
to Table 1-9 for descriptions of each of the LEDs.
SD Card Slot Cover
You must use the SD card slot cover to protect the SD card in hazardous locations. Do not
remove an SD card while either LED is flashing or lit because file corruption may result.
Caution Do not insert or remove SD cards unless power has been switched off or
the area is known to be nonhazardous.
Caution Removing the SD card while the IN USE LED is lit might result in
incomplete or lost data.
Table 1-9. SD Card LED Indications
LED LED Color LED State Description
SD ACT Yell o w Off There is no I/O activity on the SD card in
the slot.
Flashing The cDAQ controller is performing I/O on
the SD card in the slot. Do not remove the
SD card while this LED is flashing.
SD IN USE Green Off There is no SD card present in the slot or
the cDAQ controller 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.
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