# OPC UA module question

**URL:** <https://forum.inductiveautomation.com/t/opc-ua-module-question/61894>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [July 14, 2022, 12:45pm UTC](https://forum.inductiveautomation.com/t/opc-ua-module-question/61894 "2022-07-14T12:45:36Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\
**Post date:** [July 14, 2022, 12:45pm UTC](https://forum.inductiveautomation.com/t/opc-ua-module-question/61894/1 "2022-07-14T12:45:36Z")

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Does anyone know the maximum number of nodes that can read in any request?

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**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\
**Post date:** [July 14, 2022, 12:49pm UTC](https://forum.inductiveautomation.com/t/opc-ua-module-question/61894/2 "2022-07-14T12:49:04Z")

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I ask because I have a Siemens OPC connection that faults out frequently and we are trying to figure out why.

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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:** [July 14, 2022, 12:59pm UTC](https://forum.inductiveautomation.com/t/opc-ua-module-question/61894/3 "2022-07-14T12:59:44Z")

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The max would vary from server to server.

There is probably a warning or error in your logs around the time of the faults that would help figure out why.

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<div class="post-metadata">

**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\
**Post date:** [July 14, 2022, 4:21pm UTC](https://forum.inductiveautomation.com/t/opc-ua-module-question/61894/4 "2022-07-14T16:21:51Z")

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Thanks I also see this

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/f/7f54ee5718a1c63341c8832bdf2887f97a11da34.png)

any way to explain this code=15?

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<div class="post-metadata">

**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:** [July 14, 2022, 4:23pm UTC](https://forum.inductiveautomation.com/t/opc-ua-module-question/61894/5 "2022-07-14T16:23:09Z")

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Privilege violation, I think. It’s from a legacy ControlLogix driver connection and not your Siemens OPC UA connection though, so entirely irrelevant.

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**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\
**Post date:** [July 14, 2022, 4:25pm UTC](https://forum.inductiveautomation.com/t/opc-ua-module-question/61894/6 "2022-07-14T16:25:17Z")

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your right, it doesnt pertain to the siemens at all just curious about it.