Preventing Occasional Failures When Working With PXIe External Triggers?

Updated Sep 10, 2024

Reported In

Hardware

  • PXIe-7971

Issue Details

I’m working with the PXIe-7971r, and I’m sending either an internal or external trigger to the card on the PXI_Trig0. However, sometimes (at random), the card doesn’t trigger with the external trigger.

What can I do to avoid this behavior?

Solution

The PXIe-7971 is hardware-driven. Therefore, if you open multiple instances to the FPGA, it’s essential to ensure that you close the references correctly. Otherwise, incorrect closure of a reference can lead to unexpected behavior.

Regarding the 7971, since it is hardware-driven, when you close the FPGA reference, make sure you don’t have “Close and Reset if Last Reference” selected on the Close node. Selecting this option would put the FPGA VI into a stopped state. To avoid this, select “Close” instead.

Screenshot_15.png

Related Links

Other Support Options

Ask the NI Community

Collaborate with other users in our discussion forums



Request Support from an Engineer

A valid service agreement or active software subscription may be required, and support options vary by country.