# Ignition 8.1 Siemens UDT via OPC UA trouble

**URL:** <https://forum.inductiveautomation.com/t/ignition-8-1-siemens-udt-via-opc-ua-trouble/54865>\
**Category:** Ignition\
**Tags:** perspective, ignition81\
**Created:** [January 11, 2022, 9:02am UTC](https://forum.inductiveautomation.com/t/ignition-8-1-siemens-udt-via-opc-ua-trouble/54865 "2022-01-11T09:02:09Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![deon.korb](https://avatars.discourse-cdn.com/v4/letter/d/8c91f0/32.png) [@deon.korb](https://forum.inductiveautomation.com/u/deon.korb)\
**Post date:** [January 12, 2022, 9:59am UTC](https://forum.inductiveautomation.com/t/ignition-8-1-siemens-udt-via-opc-ua-trouble/54865/15 "2022-01-12T09:59:33Z")

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This thread shows the structure and results of how we use it:  
[Siemens S7-1500 OPC UA Struct with TON Member - Ignition - Inductive Automation Forum](https://forum.inductiveautomation.com/t/siemens-s7-1500-opc-ua-struct-with-ton-member/37247)

Never had issues reading a struct, but have never tried reading the whole UDT either (some forbidden members)

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