# Cannot read some tags inside Rockwell AOI

**URL:** <https://forum.inductiveautomation.com/t/cannot-read-some-tags-inside-rockwell-aoi/38393>\
**Category:** Ignition Early Access\
**Created:** [September 4, 2020, 11:09am UTC](https://forum.inductiveautomation.com/t/cannot-read-some-tags-inside-rockwell-aoi/38393 "2020-09-04T11:09:49Z")\
**Posts on this page:** 1\
**Showing post:** 71

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**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [February 18, 2025, 4:29am UTC](https://forum.inductiveautomation.com/t/cannot-read-some-tags-inside-rockwell-aoi/38393/71 "2025-02-18T04:29:57Z")

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> [@pturmel](#):
>
> Note that Ignition never writes into the `xyz_fbk` data, and the PLC never writes to `xyz_cmd`. This is crucial to avoid race conditions. And it fits well with E/IP I/O configurations.

Hey Phil, I'm a bit embarrassed to ask, but how in Perspective do you recommend issuing commands from SCADA to `xyz_cmd` registers, and having them reset themselves from SCADA (without PLC writing to them) so as to avoid race conditions? This still confuses me.. would you suggest tag value change scripts to do this resetting?

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