Re: New forum topic - Open Control
Feb 19, 2002 12:29 pm, by Bob Welker
Text :
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>>I addressed this further up. Suffice to re-iterate that Logix changes file format as often to more often than MS word. No net gain to the end user, but you do have to upgrade your software. Funny how that happens every time. And all they can tell you each time is "Well, we didn't anticipate well enough to make the last version expandable. oops." Funny they never
learn, tho.
<<
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Not only that (which is annoying enough) but, and I guess this depends on what version of RSL created the ladder file, but an older version of RSL reading a later version file typically causes my computer to crash.

Which prompts me to wonder ... how hard would it be to preface the file with a data block describing which version created it?

That way, RSL would see immediately that it might not be able to digest the data, and give a relevant error message (i.e. - "Look, Tightwad, Upgrade now to RSL vx.xx. The data file was created with RSL vx.xx, and RSL version y.yy you are now using may cause the computer to crash if I read it").

A question comes to mind as well. Has anybody run into the situation where the latest and greatest version cannot read files created with a previous
version?

Bob
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