# OPC UA connection to a Fanuc Robot

**URL:** <https://forum.inductiveautomation.com/t/opc-ua-connection-to-a-fanuc-robot/101364>\
**Category:** Ignition\
**Tags:** opcua\
**Created:** [January 24, 2025, 8:11pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-a-fanuc-robot/101364 "2025-01-24T20:11:17Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Alicia\_Kirk](https://avatars.discourse-cdn.com/v4/letter/a/71e660/32.png) [@Alicia\_Kirk](https://forum.inductiveautomation.com/u/Alicia_Kirk)\
**Post date:** [January 24, 2025, 8:11pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-a-fanuc-robot/101364/1 "2025-01-24T20:11:18Z")

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Hello,

I am connecting to Fanuc Robots using OPC UA. I am able to connect to some of them and not to others. Everything that I've read online says that I should be able to connect to the 4 that have the required criteria; R553 Option, V9.1 or later, CD38A ethernet connection. Am I missing something obvious to connect to the 4 robots that meet all the criteria?  
This is the hyperlink I have been using to connect to all the other robots.  
opc.tcp://ip address:4880/FANUC/NanoUAServer  
This is the error that I get when trying to connect through OPC UA to the 4 robots.  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/c/4cbe211bc17e83b944271378df802a4267b3f23d.png)  
Any help or guidance that can be given would be greatly appreciated.

Thank you!

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**Author:** ![dkhayes117](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/dkhayes117/32/68344_2.png) [@dkhayes117](https://forum.inductiveautomation.com/u/dkhayes117)\
**Post date:** [January 24, 2025, 8:20pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-a-fanuc-robot/101364/2 "2025-01-24T20:20:14Z")

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The error message says `connection refused`, which could be a wrong port number, IP address, or firewall blocking the traffic.

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**Author:** ![Marcus\_Sysum](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/marcus_sysum/32/57944_2.png) [@Marcus\_Sysum](https://forum.inductiveautomation.com/u/Marcus_Sysum)\
**Post date:** [January 29, 2025, 5:07pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-a-fanuc-robot/101364/3 "2025-01-29T17:07:01Z")

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What controller version? it has to be a R30I-B+ controller to support OPCUA. you can have a B controller that has v9.1 or higher and the R553 option but then it you would have to enable modbus In order to communicate with them using modbus TCP.