# Ignition edge - IIoT required for internal OPC UA server access?

**URL:** <https://forum.inductiveautomation.com/t/ignition-edge-iiot-required-for-internal-opc-ua-server-access/61709>\
**Category:** Ignition\
**Created:** [July 11, 2022, 2:28am UTC](https://forum.inductiveautomation.com/t/ignition-edge-iiot-required-for-internal-opc-ua-server-access/61709 "2022-07-11T02:28:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![fshriver](https://avatars.discourse-cdn.com/v4/letter/f/db5fbb/32.png) [@fshriver](https://forum.inductiveautomation.com/u/fshriver)\
**Post date:** [July 11, 2022, 2:28am UTC](https://forum.inductiveautomation.com/t/ignition-edge-iiot-required-for-internal-opc-ua-server-access/61709/1 "2022-07-11T02:28:40Z")

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So, briefly explained, my use case is as follows:

I use **Ignition Edge** on a Raspberry Pi to collect values directly from a PLC, and have a script running on that same Raspberry Pi that periodically looks at the current process values **Edge** has, does some computation on them, and does other things as necessary. This all needs to be done on the Pi, there can be no communication to the outside world - there’s no centralized SCADA system to speak of so each Pi has to be responsible for its own data collection. Up to this point, I’ve roughed out a prototype using the trial version of **Edge** which collects data from the PLC. My script then polls data from the internal OPC UA server that **Edge** has, so that my script can do what it needs to. So, **Edge** does the data collection and heavy lifting, and I use an internal OPC UA client to periodically check the values that **Edge** has via its internal OPC UA server (internally, **Edge’s** UI calls it a “loopback connection”?)

A while ago I had a discussion where it was explained to me that, if I wanted to use **Ignition Edge** in this manner, when I was ready to buy a license and deploy my best bet would be to purchase the **Ignition Edge IIoT** module, since that would be required to enable OPC UA functionality. But I’m looking at the trial version of **Edge** , which doesn’t appear to have the **Ignition Edge IIoT** module enabled by default. Yet, I’m able to poll Ignition’s internal OPC UA server just fine.

So my question is: to have a script periodically poll **Ignition Edge** ’s OPC UA server, do I actually need to purchase the license for the **Ignition Edge IIoT** module? Am I using functionality in the trial version which won’t be available if I don’t buy the **Ignition Edge IIoT** module?

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [July 11, 2022, 11:46am UTC](https://forum.inductiveautomation.com/t/ignition-edge-iiot-required-for-internal-opc-ua-server-access/61709/2 "2022-07-11T11:46:49Z")

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For a definitive answer, contact sales.