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PCIe-6321 hardware failure when using hardware timing

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Hello, I am a nidaq beginner, so this question may have a very simple answer. I am using a PCIe-6321, and trying to use the hardware timing feature. I am controlling it with python (nidaqmx). 

 

When I run the following code (snippet from the ao_voltage_hw_timed.py example), I get an error:



"""Example of AO voltage hw operation."""
import nidaqmx


with nidaqmx.Task() as task:
    task.ao_channels.add_ao_voltage_chan("Dev1/ao0")

    task.timing.cfg_samp_clk_timing(1000)

    print("1 Channel N Samples Write: ")
    print(task.write([1.1, 2.2, 3.3, 4.4, 5.5], auto_start=True))
    task.wait_until_done()
    task.stop()


error message:


1 Channel N Samples Write:
Traceback (most recent call last):
File "/home/oconnorlabmatlab/Code/libfranka/python/nidaq/ao_voltage_hw_timed.py", line 11, in <module>
print(task.write([1.1, 2.2, 3.3, 4.4, 5.5], auto_start=True))
File "/home/oconnorlabmatlab/miniconda3/envs/robot_venv/lib/python3.9/site-packages/nidaqmx/task.py", line 1274, in write
return _write_analog_f_64(
File "/home/oconnorlabmatlab/miniconda3/envs/robot_venv/lib/python3.9/site-packages/nidaqmx/_task_modules/write_functions.py", line 28, in _write_analog_f_64
check_for_error(error_code, samps_per_chan_written=samps_per_chan_written.value)
File "/home/oconnorlabmatlab/miniconda3/envs/robot_venv/lib/python3.9/site-packages/nidaqmx/errors.py", line 181, in check_for_error
raise DaqWriteError(error_buffer.value.decode("utf-8"), error_code, samps_per_chan_written)
nidaqmx.errors.DaqWriteError: A hardware failure has occurred. The operation could not be completed as specified.
Task Name: _unnamedTask<0>

Status Code: -50152


When I comment out the cfg_samp_clk_timing line (i.e. not using hardware timing), I do not get the error message:


1 Channel N Samples Write:
5


How can I troubleshoot this?

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Error -50152: "A Hardware Failure Has Occurred"

Try changing PCI/PCIe slots inside the computer.

-------------------------------------------------------
Control Lead | Intelline Inc
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Solution
Accepted by topic author willsni

The solution was to disable IOMMU in BIOS / linux kernel bootup parameters. This known issues page has the solution https://www.ni.com/en/support/documentation/bugs/23/ni-linux-device-drivers-2023-q2-known-issues.htm...

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