Explanation of LED Indicators on FlexRIO Modular I/O Controllers

The following figure shows the LEDs in more detail.

Figure 1. LEDs

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Table 1. LED Indicator Status
LED State Indication
POWER Lit Controller is powered.
Off Controller is not powered.
STATUS 2 flashes every few seconds There is no software installed, which is the out-of-box state, or the controller has detected an error in its software.

An error can occur when an attempt to upgrade the software is interrupted. Refer to the MAX Help for information about reinstalling software on the controller.
3 flashes every few seconds The controller is in safe mode. Refer to the MAX Help for information about safe mode.
4 flashes every few seconds The software has crashed twice without rebooting or cycling power between crashes. This usually occurs when the controller runs out of memory. Review your RT VI and check the memory usage. Modify the VI as necessary to solve the memory usage issue.
Continuously flashing The controller has not booted into NI Linux Real-Time. The controller has either booted into an unsupported operating system, was interrupted during the boot process, or detected an unrecoverable software error.

Or, this indicates a hardware error. An internal power supply has failed. Check front-panel I/O and adapter modules connections for shorts. Remove any shorts and power cycle the controller. If the problem persists, contact NI.

Lit, solid The controller is booting up.
Off Normal operation.
FPGA USER LED — The FPGA USER LED is a green LED that is controlled directly from the LabVIEW FPGA diagram. To control this LED, use an FPGA I/O node on your FPGA diagram. Refer to the LabVIEW Help for information about programming this LED.
RT USER LED — The RT USER LED is a green LED that is controlled directly from your LabVIEW Real-Time application. You can define the RT USED LED to meet the needs of your application. To define this LED, use the Real-Time LED VIs in LabVIEW. For more information about the Real-Time LED VIs, refer to the LabVIEW Help.