# Siemens S7-1200 OPC UDT error

**URL:** <https://forum.inductiveautomation.com/t/siemens-s7-1200-opc-udt-error/56756>\
**Category:** Ignition\
**Created:** [March 3, 2022, 1:29am UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-opc-udt-error/56756 "2022-03-03T01:29:49Z")\
**Posts on this page:** 1\
**Showing post:** 3

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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:** [March 3, 2022, 1:45am UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-opc-udt-error/56756/3 "2022-03-03T01:45:24Z")

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As we discovered in [this post](https://forum.inductiveautomation.com/t/ignition-8-1-siemens-udt-via-opc-ua-trouble/54865/20) the Server Interface method cannot be used, I think because the server does not include datatype definitions in the datatype dictionary for this area.

I have reached out to a contact I have at Siemens to confirm.

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