# Siemens OPC UDT

**URL:** <https://forum.inductiveautomation.com/t/siemens-opc-udt/38634>\
**Category:** Ignition\
**Created:** [September 13, 2020, 4:27pm UTC](https://forum.inductiveautomation.com/t/siemens-opc-udt/38634 "2020-09-13T16:27:14Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [September 13, 2020, 4:43pm UTC](https://forum.inductiveautomation.com/t/siemens-opc-udt/38634/2 "2020-09-13T16:43:04Z")

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Ignition maps OPC UA structured datatypes into Documents (JSON), not into any kind of automatically generated Ignition UDT.

The process to map these documents into UDTs is a little involved but it’s described here: [OPC UA struct data type?](http://forum.inductiveautomation.com/t/opc-ua-struct-data-type/26905/2)

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