PXIe-4468 LED Indicators

The PXIe-4468 features an ACC (Access), Active, AI 0, AI 1, AO 0, and AO 1 LED.

ACC (Access) LED

The Access LED, located on the module front panel, indicates the basic hardware status of the PXIe-4468.

The following table lists the Access LED states.

Table 5. Access LED Indicator Status
Status Indicator Device State
(Off) The PXIe-4468 is not yet functional, or has detected a problem with a PXI power rail.
Green The PXIe-4468 is ready to be programmed.
Amber The PXIe-4468 is being accessed. The Access LED flashes amber for 75 ms when the PXIe-4468 is accessed.

Why Is the Access LED Off When the Chassis Is On?

The LEDs may not light until the module has been configured in MAX. Before proceeding, verify that the PXIe-4468 appears in MAX.

If the Access LED fails to light after you power on the chassis, a problem may exist with the chassis power rails, a hardware module, or the LED.
Notice Apply external signals only while the PXIe-4468 is powered on. Applying external signals while the module is powered off may cause damage.
  1. Disconnect any signals from the module front panels.
  2. Power off the chassis.
  3. Remove the module from the chassis and inspect it for damage. Do not reinstall a damaged module.
  4. Install the module in a different chassis slot from which you removed it.
  5. Power on the chassis.
    Note If you are using a PC with a device for PXI remote control system, power on the chassis before powering on the computer.
  6. Verify that the module appears in MAX.
  7. Reset the module in MAX and perform a self-test.

Active LED

The Active LED, located on the module front panel, indicates the module operation state.

The following table lists the Active LED states.

Table 6. Active LED Indicator Status
Status Indicator Device State
(Off) The PXIe-4468 is not acquiring or preparing to acquire data.
Amber The PXIe-4468 is waiting for a trigger event to start an acquisition.
Green An acquisition has been triggered, and the PXIe-4468 is currently acquiring data.
Alternating Amber/Green The PXIe-4468 is changing reference clock timebase.
Red An error has been detected by hardware. Use NI-DAQmx software to determine the cause and/or clear the error by resetting the module.

AI 0 and AI 1 LEDs

The AI 0 and AI 1 LEDs, located on the module front panel, indicate the signal status of the analog input channels.

The following table lists the AI 0 and AI 1 LED states.

Table 7. AI 0 and AI 1 LED Status Indicator
Status Indicator Device State
Alternating Amber/Green The reference clock source is changing to onboard or PXIeClk100.
Amber The channel is waiting for a trigger to start acquiring.
Green The channel is actively acquiring a signal.
Red An error has been detected on the channel or board. Refer to the Why is the AI 0, AI 1, AO 0, or AO 1 LED Red? section below for more information.

AO 0 and AO 1 LEDs

The AO 0 and AO 1 LEDs, located on the module front panel, indicate the signal status of the analog output channels.

The following table lists the AO 0 and AO 1 LED states.

Table 8. AO 0 and AO 1 LED Status Indicator
Status Indicator Device State
Alternating Amber/Green The reference clock source is changing to onboard or PXIeClk100.
Amber The channel is waiting for a trigger to start generating.
Green The channel is actively generating a signal.
Red An error has been detected on the channel or board. Refer to the Why is the AI 0, AI 1, AO 0, or AO 1 LED Red? section below for more information.

Why is the AI 0, AI 1, AO 0, or AO 1 LED Red?

A red AI 0, AI 1, AO 0, and AO 1 LED indicates that an error has been detected on the channel or board.

Possible errors include the following:
  • The board is overheated.
  • The power supply is not at the proper voltage.
  • A clocking error occurred (PLL fell out of lock or PXIeClk100 was not present when using the external timebase).
  • An external overvoltage or overcurrent was detected.
  • An overload was detected.
  • A streaming underflow was detected on the channel.
  • Internal hardware failed (either due to software or hardware failure).

An external overvoltage, overcurrent, or overload error can be read through NI-DAQmx property nodes.