This behavior may be expected depending on the version of LabVIEW you are using. Check your version of LabVIEW, and read the corresponding section below for more information.
Prior to the 2021 release, the LabVIEW Real-Time Module was only available for 32-bit development environments, and therefore could only be used with LabVIEW 32-bit. Software requirements of CompactRIO driver include the LabVIEW Real-Time Module. Because of this, viewing Real-Time targets, such as the CompactRIO, was not possible with 64-bit LabVIEW.
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