# S7-400 UDT STRING addressing

**URL:** <https://forum.inductiveautomation.com/t/s7-400-udt-string-addressing/96375>\
**Category:** Ignition\
**Tags:** siemens\
**Created:** [September 24, 2024, 3:06pm UTC](https://forum.inductiveautomation.com/t/s7-400-udt-string-addressing/96375 "2024-09-24T15:06:07Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Cody\_Morgan](https://avatars.discourse-cdn.com/v4/letter/c/db5fbb/32.png) [@Cody\_Morgan](https://forum.inductiveautomation.com/u/Cody_Morgan)\
**Post date:** [September 25, 2024, 7:24am UTC](https://forum.inductiveautomation.com/t/s7-400-udt-string-addressing/96375/2 "2024-09-25T07:24:09Z")

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I can confirm that the max size is 210 with the current Siemens driver. I'll take a closer look at this tomorrow, but are you getting any errors while trying to read?

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