Kevin L Posted April 24, 2020 Report Share Posted April 24, 2020 I am trying to replace a PDF file with an edited update of the same document but, no matter what I try, a message window appears with "cannot load project to controller due to unknown error" I have even tried a PDF file totally blank, other than the word "test", no joy Strangely, I can replace the file with another that has already been downloaded I'm mystified! Quote Link to comment Share on other sites More sharing options...
Saragani Posted April 27, 2020 Report Share Posted April 27, 2020 Are you downloading it to the external SD? Is there a chance that the external SD has been locked? (There is a system tag regarding the SD, with a member called "Locked" or "Is Locked") Rebooting the PLC if that happens can sometimes help. Quote Link to comment Share on other sites More sharing options...
Kevin L Posted April 29, 2020 Author Report Share Posted April 29, 2020 Overcame the problem by removing the SD card and downloading the files directly to it on my laptop Quote Link to comment Share on other sites More sharing options...
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