# Siemens Profinet

**URL:** <https://forum.inductiveautomation.com/t/siemens-profinet/85006>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [January 31, 2024, 9:39am UTC](https://forum.inductiveautomation.com/t/siemens-profinet/85006 "2024-01-31T09:39:39Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![victordcq](https://avatars.discourse-cdn.com/v4/letter/v/f6c823/32.png) [@victordcq](https://forum.inductiveautomation.com/u/victordcq)\
**Post date:** [January 31, 2024, 10:06am UTC](https://forum.inductiveautomation.com/t/siemens-profinet/85006/2 "2024-01-31T10:06:54Z")

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Different tags dont really update at the same time,

i found this on the forum

> [@OPC Tags not updating at the same time?](https://forum.inductiveautomation.com/t/opc-tags-not-updating-at-the-same-time/23274/3):
>
> This is not true. When tags are subscribed to OPC items, the OPC server makes a best effort to deliver the data at the pace indicated in the scan class, but makes no guarantee. No guarantees for order of delivery, either. Tag change events can and do start executing right away, while other tags on the scan class are still updating, if updating at all at that time. In your case, I would have a tag subscribed to the PLC trigger item as you describe, with tag change script, but I would use sys…

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