PL7 Backwards Compatible?

[NetMatt 0]

If I make a project in PL7 3.4, and then a peer uses PL7 4.5 to upload/change/download it...will there be any problems with me trying to modify/upload it in 3.4 again? Anyone know? Thanks!

[Crossbow 296]

Uploading it again in the old software should not be a problem, but opening the files on the PC once the version changes might be a problem. Even in the newer versions, the determining factor is the firwmware level selected in the PLC program, which should match the firmware in the PLC. I haven't touched one in 6 years, so working on older knowledge.

[NetMatt 0]

I found the answer today. Ends up that as long as you dont say "yes" to a conversion dialog on opening, then it will be fine. If you say yes, and convert up, then your stuck with a newer rev only. Thats a pretty good design in my opinion