National Instruments NI PCI-6552 用户手册

If the ACCESS LED is not lit after you power on the PXI chassis, a problem 
may exist with the PXI power rails, a hardware device, or the LED.

The LEDs may not light until the device has been configured 

in MAX. Before troubleshooting this issue, verify that the device 
appears in MAX.

Troubleshoot this issue by completing the following steps:

1. Power off your PXI chassis.

2. Disconnect any signals from the PXI module front panel.

3. Remove the PXI module and inspect for signs of damage. Do not reinstall 

a damaged device. 

4. Reinstall the PXI module using the procedure described in 

step

.

5. Power on your PXI chassis.

6. Verify the device appears in MAX.

7. Reset the device in MAX and perform a self-test. Refer to 

 for information on performing 

device resets and self-tests in MAX.

8. If the ACCESS LED still fails to light, contact NI support at 

ni.com/support

.

Table 9.  ACCESS LED Indicators

Off

Device not ready.

Amber

Device being accessed by software.

Green

Device ready to be programmed.

Red

Running the niHSDIO Self Test VI or calling 
niHSDIO_self_test

 produced a failure.