# OPC UA Server not accessing IRC5 controller tags

**URL:** <https://tech-community.robotics.abb.com/t/opc-ua-server-not-accessing-irc5-controller-tags/10304>\
**Category:** IRC5\
**Tags:** opc-ua\
**Created:** [July 27, 2021, 3:27pm UTC](https://tech-community.robotics.abb.com/t/opc-ua-server-not-accessing-irc5-controller-tags/10304 "2021-07-27T15:27:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![stefpender](https://avatars.discourse-cdn.com/v4/letter/s/9fc348/32.png) [@stefpender](https://tech-community.robotics.abb.com/u/stefpender)\
**Post date:** [July 27, 2021, 3:27pm UTC](https://tech-community.robotics.abb.com/t/opc-ua-server-not-accessing-irc5-controller-tags/10304/1 "2021-07-27T15:27:49Z")

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When I use the OPC UA Server with a virtual controller, I have no issues accessing data tags within the IRC5 controller. When I connect to an actual robot, I’m unable to access the IRC5 data nodes. I see "MonitoredItem.MonitoredItem - Connect error: BadNodeIDUnknown “Error creating monitored item on the server. BadNodeIdUnknown” Please let me know if you have any suggestions. Thank you.

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**Author:** ![Robster](https://avatars.discourse-cdn.com/v4/letter/r/cdc98d/32.png) [@Robster](https://tech-community.robotics.abb.com/u/Robster)\
**Post date:** [November 15, 2021, 8:23pm UTC](https://tech-community.robotics.abb.com/t/opc-ua-server-not-accessing-irc5-controller-tags/10304/2 "2021-11-15T20:23:55Z")

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I have exactly the same problem (but with a virtual controller). Could you solve the problem?