# Ignition OPC UA Client Failover Problem

**URL:** <https://forum.inductiveautomation.com/t/ignition-opc-ua-client-failover-problem/108384>\
**Category:** Ignition\
**Tags:** redundancy, opcua\
**Created:** [July 11, 2025, 6:11pm UTC](https://forum.inductiveautomation.com/t/ignition-opc-ua-client-failover-problem/108384 "2025-07-11T18:11:43Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![mazeyrat](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mazeyrat/32/10955_2.png) [@mazeyrat](https://forum.inductiveautomation.com/u/mazeyrat)\
**Post date:** [July 13, 2025, 4:58am UTC](https://forum.inductiveautomation.com/t/ignition-opc-ua-client-failover-problem/108384/5 "2025-07-13T04:58:52Z")

</div>

Another solution is to create 2 opc tags and a reference tag for each data you read in the plc. You monitor the primary and standby cpu and you write a parameter in each udt that drive the reference tag, for example the parameter is the folder in the path of the opc tag.

This solution is quite robust with a quick failover and all the data switch together.  
Creatings tag take more times but when you have have some scripts to generate them that is not a problem.

Another post:

> [@Ignition OPC UA Server Redundancy (Modbus TCP)](https://forum.inductiveautomation.com/t/ignition-opc-ua-server-redundancy-modbus-tcp/67123):
>
> Like the attached file, I want to redundancy If possible, please tell me how to do it.

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