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He's probably talking about the OS.

Unless something goes horribly wrong (like disconnecting the cable or powering down while updating) the data and PLC program will stay intact.

But the question is, "Is it possible?"

Yes, it's possible if one of the above mentioned things happens.  But you should have a backup of your program.

Joe T.

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I've never lost a program during an OS update. If everything goes by the book, no worries. Anything can happen. Always have 3 backups of complex PLC program that took anything over a day to develop. Preferably on three different media types and in three unique physical locations not under the same roof.

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