# Using SEL RTAC opc-ua server **URL:** \ **Category:** Ignition\ **Tags:** opcua\ **Created:** [March 23, 2026, 1:16pm UTC](https://forum.inductiveautomation.com/t/using-sel-rtac-opc-ua-server/114622 "2026-03-23T13:16:53Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![daniel.thomson1](https://avatars.discourse-cdn.com/v4/letter/d/46a35a/32.png) [@daniel.thomson1](https://forum.inductiveautomation.com/u/daniel.thomson1)\ **Post date:** [March 23, 2026, 1:16pm UTC](https://forum.inductiveautomation.com/t/using-sel-rtac-opc-ua-server/114622/1 "2026-03-23T13:16:53Z")
Probing the hive mind here to see if anyone else has used one of the following with the OPC-UA feature and gotten a gateway to connect as a client, use it as an OPC UA server and browse tags on it? We know it is possible according to the documentation – but the discrepancy between documentation and reality is sometimes quite vast. We’re looking at using one, but have yet to be able to get one to bench test/do a shake down of the process so are hesitant. If any experiences can be shared that would be great! Known rtacs with OPC UA feature: - SEL‑3350 RTAC - SEL‑3555 RTAC - SEL‑3560 RTAC ---
**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:** [March 23, 2026, 1:22pm UTC](https://forum.inductiveautomation.com/t/using-sel-rtac-opc-ua-server/114622/2 "2026-03-23T13:22:22Z")
There's a thread [here](https://forum.inductiveautomation.com/t/rtac-hosted-opc-ua-and-iec-61850-data-structures/71662) where people have all been connected and dealing with some other issues. That was a few years ago and the OPC UA server feature had just been released, it's probably in a bit better shape now. I've also seen via support a few instances of people connected this way. ---
**Author:** ![tgarrison](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/tgarrison/32/80965_2.png) [@tgarrison](https://forum.inductiveautomation.com/u/tgarrison)\ **Post date:** [March 23, 2026, 3:08pm UTC](https://forum.inductiveautomation.com/t/using-sel-rtac-opc-ua-server/114622/3 "2026-03-23T15:08:33Z")
The hardest part of the RTACs is the tag mapping 27step process you have to go thru. Easiest way - have Sweitzer's tech support remote in and walk you thru setting things up for a device. It's not terribly difficult (although stupidly tedious) to do so once you see the actual steps. ---
**Author:** ![Cory.grube](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/cory.grube/32/20476_2.png) [@Cory.grube](https://forum.inductiveautomation.com/u/Cory.grube)\ **Post date:** [June 2, 2026, 1:07pm UTC](https://forum.inductiveautomation.com/t/using-sel-rtac-opc-ua-server/114622/4 "2026-06-02T13:07:00Z")
I just had a call with SEL support to confirm, their newer `SEL-2241-2` Axion controller also supports OPC UA server/client. The older model (`SEL-2241`) does not. Note that the website doesn't mention the OPC UA support yet. Apparently, OPC UA is available on any of the Intel-based controllers, but not on the PowerPC ones.