Error -2561 Occurred at Write Data Using LabVIEW Data Plugin

Updated May 30, 2025

Reported In

Software

  • LabVIEW

Issue Details

I downloaded a DataPlugin from ni.com/dataplugins that shows a Read/Write direction in the website. However, when I use the Open Data Storage Express VI in LabVIEW, I am unable to select create a file, the only option is locked in for open (read only). When trying to write to the file I get Error -2561 occurred at Write Data:
 
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Does this mean that the data plugin really only supports reading and not writing to a file with the correct extension?

Solution

Only TDM and TDMS files support all the options listed in "Overwrite options (if not wired)" in the Open Data Storage Express VI . If the DataPlugin you specify in the DataPlugin list is not a .tdms or .tdm file, LabVIEW uses the open (read only) option by default to open the data file. To write to the data file, you can wire a create or create or replace control to the function (open:0) block diagram input and then use the Write Data Express VI to write data to the file.

If the write-protected error is shown, the DataPlugin is meant to be for reading only. In case the download link for said DataPlugin mistakenly shows a Read/Write direction, please submit feedback in the website to update the direction to the correct value, or contact NI Support for confirmation.

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