# Reading large block of data with OPCUA

**URL:** <https://forum.inductiveautomation.com/t/reading-large-block-of-data-with-opcua/39774>\
**Category:** Ignition\
**Tags:** ignition80\
**Created:** [October 17, 2020, 7:11am UTC](https://forum.inductiveautomation.com/t/reading-large-block-of-data-with-opcua/39774 "2020-10-17T07:11:51Z")\
**Posts on this page:** 1\
**Showing post:** 6

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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:** [October 17, 2020, 8:30pm UTC](https://forum.inductiveautomation.com/t/reading-large-block-of-data-with-opcua/39774/6 "2020-10-17T20:30:08Z")

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That’s going to be much slower than requesting only each top level structured value instead, at least if you are using the OPC UA server built in to the S7-1500.

When reading a structured value it will be received in Ignition as a JSON object, containing all the member values and any member structs as embedded JSON objects modeled the same way.

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