# Problem using node-red-contrib-opcua

**URL:** <https://discourse.nodered.org/t/problem-using-node-red-contrib-opcua/93460>\
**Category:** General\
**Tags:** opcua\
**Created:** [25 November 2024 17:53 UTC](https://discourse.nodered.org/t/problem-using-node-red-contrib-opcua/93460 "2024-11-25T17:53:28Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![gfattal](https://avatars.discourse-cdn.com/v4/letter/g/8e8cbc/32.png) [@gfattal](https://discourse.nodered.org/u/gfattal)\
**Post date:** [25 November 2024 17:53 UTC](https://discourse.nodered.org/t/problem-using-node-red-contrib-opcua/93460/1 "2024-11-25T17:53:28Z")

</div>

Hello I am very new user of node-red. I am trying to experiment with it. I want to read from an OPC UA server, I used Siemens S7-1200 PLC as an OPC Server. I connected the PLC with a Raspberry Pi on an Ethernet network with no problem. I tried using Youtube tutorial create a node-red flow using the node-red-contrib-opcua install. I never have been able to communicate, using Anonymous Login and No Security, the Pi communicate with PLC no errors of connection in the debug window, and the payload return always with an undefined variable type. Can anyone help me? Do we need to pay a license fee to use the node-red-contrib-opcua ?  
Thank you.

---

<div class="post-metadata">

**Author:** ![pieropirol](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/pieropirol/32/96989_2.png) [@pieropirol](https://discourse.nodered.org/u/pieropirol)\
**Post date:** [7 December 2024 09:27 UTC](https://discourse.nodered.org/t/problem-using-node-red-contrib-opcua/93460/2 "2024-12-07T09:27:10Z")

</div>

Did you find a solution? Same problem here.

---

<div class="post-metadata">

**Author:** ![gfattal](https://avatars.discourse-cdn.com/v4/letter/g/8e8cbc/32.png) [@gfattal](https://discourse.nodered.org/u/gfattal)\
**Post date:** [9 December 2024 15:26 UTC](https://discourse.nodered.org/t/problem-using-node-red-contrib-opcua/93460/3 "2024-12-09T15:26:21Z")

</div>

I did not find a solution. I wander if it ever worked. For now I abandoned this trial. If ever you find a solution I will appreciate if you share it with me.

---

<div class="post-metadata">

**Author:** ![pieropirol](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/pieropirol/32/96989_2.png) [@pieropirol](https://discourse.nodered.org/u/pieropirol)\
**Post date:** [10 December 2024 11:04 UTC](https://discourse.nodered.org/t/problem-using-node-red-contrib-opcua/93460/4 "2024-12-10T11:04:06Z")

</div>

![opcua_s7](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/b/6b9f9603abb03eccb0a823aae03ca2ae23f05378.png)

Quite simple.  
You have to connect the wire to the first output.  
😂

---

<div class="post-metadata">

**Author:** ![gfattal](https://avatars.discourse-cdn.com/v4/letter/g/8e8cbc/32.png) [@gfattal](https://discourse.nodered.org/u/gfattal)\
**Post date:** [10 December 2024 20:28 UTC](https://discourse.nodered.org/t/problem-using-node-red-contrib-opcua/93460/5 "2024-12-10T20:28:29Z")

</div>

🙂 Thank you very much. It works also on my side.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [10 March 2025 20:28 UTC](https://discourse.nodered.org/t/problem-using-node-red-contrib-opcua/93460/6 "2025-03-10T20:28:55Z")

</div>

This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.