# Siemens S7 PLCs and PLC OPC UA Server

**URL:** <https://forum.inductiveautomation.com/t/siemens-s7-plcs-and-plc-opc-ua-server/72886>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [April 25, 2023, 8:11pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-plcs-and-plc-opc-ua-server/72886 "2023-04-25T20:11:42Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Shea\_Molthen](https://avatars.discourse-cdn.com/v4/letter/s/c37758/32.png) [@Shea\_Molthen](https://forum.inductiveautomation.com/u/Shea_Molthen)\
**Post date:** [April 27, 2023, 12:58pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-plcs-and-plc-opc-ua-server/72886/5 "2023-04-27T12:58:20Z")

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I've done some testing and everything seems to work as intended. The only issue I ran into was if I try to edit tags in quick succession, only the last one takes. I found this [post](https://forum.inductiveautomation.com/t/writing-to-siemens-tag-structure-via-opc-connection/58217/4) and turned on optimistic writes and allowed data backfill on the tag provider. Thanks!

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