Was burned today on a job site where customer upgraded all their contrologix PLCs to V27 & the new 1756-L85E V28.
The Logix Driver does not support V28. There is a beta version of the driver, so be aware if anyone uses the L8x series. Had to have tech support email me the beta Logix 21 driver module
Also if you upgrade Logix from V20 to V21+, all the SQLTags need to be reworked. Global scope tags in the V20 driver were [PLC]Global.TagName , in the V21+ driver Global tags are [PLC]TagName