# SIEMENS OPC UA Server crashes after starting flow in EVENT Mode

**URL:** <https://discourse.nodered.org/t/siemens-opc-ua-server-crashes-after-starting-flow-in-event-mode/46798>\
**Category:** Industrial\
**Created:** [7 June 2021 07:35 UTC](https://discourse.nodered.org/t/siemens-opc-ua-server-crashes-after-starting-flow-in-event-mode/46798 "2021-06-07T07:35:59Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [7 June 2021 07:42 UTC](https://discourse.nodered.org/t/siemens-opc-ua-server-crashes-after-starting-flow-in-event-mode/46798/2 "2021-06-07T07:42:55Z")

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OPC UA server should not crash even if you deliberately send it a bunch of nonsense - its just poor programming. You need to contact the products developers and tell them their software is flaky.

> [@SRmag](#):
>
> or does somebody know how to fix it?

You could use s7 nodes and communicate direct to PLC instead.

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