# AB CompactLogix Driver Reading bad values

**URL:** <https://forum.inductiveautomation.com/t/ab-compactlogix-driver-reading-bad-values/11673>\
**Category:** Ignition\
**Created:** [May 16, 2016, 5:07pm UTC](https://forum.inductiveautomation.com/t/ab-compactlogix-driver-reading-bad-values/11673 "2016-05-16T17:07:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![cezipper](https://avatars.discourse-cdn.com/v4/letter/c/58956e/32.png) [@cezipper](https://forum.inductiveautomation.com/u/cezipper)\
**Post date:** [May 16, 2016, 5:07pm UTC](https://forum.inductiveautomation.com/t/ab-compactlogix-driver-reading-bad-values/11673/1 "2016-05-16T17:07:50Z")

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I am getting wrong values (-2.56165301E17 in the OPC-UA driver instead of 0 per RSLogix5000 and 5.58972E-40 instead of 100 as a couple examples) with the Allen-Bradley CompactLogix driver (and a Rev 19 PLC program). I am reading the values correctly with the Allen-Bradley Logix Driver so I will just use it, but the Inductive University video says I should not for performance issues, so I just wanted to see if anyone had any suggestions on other things I could check to fix the issue.