The PXIe-4051 features an Access LED and Voltage LED.

Access LED

The Access LED, located on the module front panel, indicates module power and access.

The following table lists the Access LED states.

Table 7. Access LED Indicator Status
Status Indicator Device State
(Off) Not Powered
Green Powered
Amber Device is being accessed

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

The LEDs may not light until the module has been configured in Hardware Configuration Utility or MAX. Before proceeding, verify that the PXIe-4051 appears in Hardware Configuration Utility or 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-4051 is powered on. Applying external signals while the module is powered off may cause damage.
  1. Disconnect any signals from the module front panel.
  2. Power off the chassis.
  3. Remove the module from the chassis and inspect it for damage.
    Notice Do not reinstall a damaged module.
  4. Install the module in a different, supported slot within the same PXI chassis.
  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 Hardware Configuration Utility or MAX.
  7. Reset the module in Hardware Configuration Utility or MAX and perform a self-test.

Voltage LED

The Voltage LED, located on the module front panel, indicates the module input channel state.

The following table lists the Voltage LED states.

Table 8. Voltage LED Indicator Status
Status Indicator Input Channel State
(Off) The device input terminals are disconnected from the input circuitry through internal disconnect switches.
Green The device input terminals are connected to the input circuitry and < 42.4 V DC is present.
Amber The device input terminals are connected to the input circuitry and ≥ 42.4 V DC is present.
Red
The device has a fault or is in error. The device will not operate until the error is cleared and/or the device is reset.
Note High voltage may be present on the input terminals from external sources.

For more information on possible sources of the fault or error, refer to the driver software.
Blinking Green The device input is in an inhibited state because the INHIBIT pin is not shorted to ground. You must short the INHIBIT pin to ground to restore normal operation.
Note If ≥42.4 V DC is present, the LED shines solid amber regardless of the INHIBIT pin state.