...here is the specific EDS package for the CompactLogix controllers up to v20...
26315 - EDS files for all CompactLogix to solves browse and expanding backplane issues
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...In RSLinx, if you can see a controller's embedded Ethernet Port or a bridge module in the chassis, such as a 1768-ENBT, but cannot browse beyond it i.e. the '+' will not expand, then the chances are you don't have the correct EDS file for the chassis (backplane)...
...The older CompactLogix are complicated at the backplane level. You browse in through the embedded Ethernet port as though it is a bridge module in the chassis. It's fixed as slot 01. processor is 00, and virtual backplane, or virtual adapter (VA) is slot 03. The VA is then the 1769-Bus, which starts again under that with a VA at slot 00. You then browse your actual I/O modules here on this virtual sub-backplane, starting at slot 01, and so on. It can look complex when all expanded. I've attached a screenshot of a complex backplane arrangement from one of my projects. While obviously many EDS files are needed for this project, I've have only marked what needs an EDS file in relation to this thread...
...See attachment...