# Node-red-contrib-opcua write value to server issue

**URL:** <https://discourse.nodered.org/t/node-red-contrib-opcua-write-value-to-server-issue/100636>\
**Category:** General\
**Tags:** opcua\
**Created:** [23 March 2026 13:52 UTC](https://discourse.nodered.org/t/node-red-contrib-opcua-write-value-to-server-issue/100636 "2026-03-23T13:52:57Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Meloman](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/meloman/32/96137_2.png) [@Meloman](https://discourse.nodered.org/u/Meloman)\
**Post date:** [23 March 2026 13:52 UTC](https://discourse.nodered.org/t/node-red-contrib-opcua-write-value-to-server-issue/100636/1 "2026-03-23T13:52:57Z")

</div>

Hi,

I have been experiencing an issue for the last couple of days.

My OPC UA server is running correctly: I can create folders and variables with default values, assign permissions, and everything seems to work fine **except updating variable values**.

Since updating the value directly on the server did not work, I also tried writing the value through an OPC UA client connected to `localhost`. In both cases:

- no error is returned,
- the client node status says **"value written"** ,
- but in **Prosys OPC UA Browser** , the variable still keeps its default value `0.0` (`DataType: Float`).
- the target variable exists
- DataType is Float (correct)
- the write operation does not return any error

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/7/0/703edf535e055f2ace7b6f02c3d5f353d08cfbaf.png)

I really don't understand what is wrong in my code.

```
[{"id":"fae2ca326f795bce","type":"inject","z":"bd446618c07ec0ce","name":"","props":[{"p":"topic","vt":"str"},{"p":"datatype","v":"Float","vt":"str"},{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"ns=1;s=FESP_100144.Electricity.I_Zone_2;browseName=I_Zone_2","payload":"66.6","payloadType":"str","x":4790,"y":200,"wires":[["ad38df40190a1bb7","d4210533c043c786"]]},{"id":"ad38df40190a1bb7","type":"OpcUa-Item","z":"bd446618c07ec0ce","item":"ns=1;s=FESP_100144.Electricity.I_Zone_2;browseName=I_Zone_2","datatype":"Float","value":"66.6","name":"I_Zone_2","x":4980,"y":200,"wires":[["b5e029dae1ea8319","fbf246c61e803b7c"]]},{"id":"b5e029dae1ea8319","type":"OpcUa-Client","z":"bd446618c07ec0ce","endpoint":"d572e5ca6d878c43","action":"write","deadbandtype":"a","deadbandvalue":1,"time":10,"timeUnit":"s","certificate":"n","localfile":"","localkeyfile":"","securitymode":"None","securitypolicy":"None","useTransport":true,"maxChunkCount":1,"maxMessageSize":8192,"receiveBufferSize":8192,"sendBufferSize":8192,"setstatusandtime":false,"keepsessionalive":false,"name":"","applicationName":"","applicationUri":"","x":5180,"y":200,"wires":[["20247d83d3716c53"],["7ad2a4e88c4b590d"],["1a6447c76a44e6b8"]]},{"id":"fbf246c61e803b7c","type":"debug","z":"bd446618c07ec0ce","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"true","targetType":"full","statusVal":"","statusType":"counter","x":5145,"y":140,"wires":[],"l":false},{"id":"20247d83d3716c53","type":"debug","z":"bd446618c07ec0ce","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"true","targetType":"full","statusVal":"","statusType":"counter","x":5345,"y":160,"wires":[],"l":false},{"id":"7ad2a4e88c4b590d","type":"debug","z":"bd446618c07ec0ce","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"true","targetType":"full","statusVal":"","statusType":"counter","x":5345,"y":220,"wires":[],"l":false},{"id":"1a6447c76a44e6b8","type":"debug","z":"bd446618c07ec0ce","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"true","targetType":"full","statusVal":"","statusType":"counter","x":5345,"y":280,"wires":[],"l":false},{"id":"d4210533c043c786","type":"debug","z":"bd446618c07ec0ce","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"true","targetType":"full","statusVal":"","statusType":"counter","x":4965,"y":140,"wires":[],"l":false},{"id":"d572e5ca6d878c43","type":"OpcUa-Endpoint","name":"Local boucle","endpoint":"opc.tcp://localhost:4840","secpol":"None","secmode":"None","none":false,"login":true,"usercert":false,"usercertificate":"","userprivatekey":""},{"id":"18a6e72559c389d7","type":"global-config","env":[],"modules":{"node-red-contrib-opcua":"0.2.350"}}]

```

If anyone has an explanation or a solution, I would be very grateful.

Thanks in advance.

---

<div class="post-metadata">

**Author:** ![sibylmarziopulcini](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/sibylmarziopulcini/32/17657_2.png) [@sibylmarziopulcini](https://discourse.nodered.org/u/sibylmarziopulcini)\
**Post date:** [8 May 2026 12:46 UTC](https://discourse.nodered.org/t/node-red-contrib-opcua-write-value-to-server-issue/100636/2 "2026-05-08T12:46:46Z")

</div>

Unfortunately I have exactly the same situation.For now the only workaround I have found is to switch to node-red-contrib-opcua-suite (it has a different syntax but it currently works for me).  
Regards,  
Marzio

---

<div class="post-metadata">

**Author:** ![Meloman](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/meloman/32/96137_2.png) [@Meloman](https://discourse.nodered.org/u/Meloman)\
**Post date:** [26 May 2026 08:52 UTC](https://discourse.nodered.org/t/node-red-contrib-opcua-write-value-to-server-issue/100636/3 "2026-05-26T08:52:06Z")

</div>

> [@sibylmarziopulcini](#):
>
> node-red-contrib-opcua-suite

Thanks,  
I'll try thi.

---

<div class="post-metadata">

**Author:** ![sibylmarziopulcini](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/sibylmarziopulcini/32/17657_2.png) [@sibylmarziopulcini](https://discourse.nodered.org/u/sibylmarziopulcini)\
**Post date:** [26 May 2026 10:18 UTC](https://discourse.nodered.org/t/node-red-contrib-opcua-write-value-to-server-issue/100636/4 "2026-05-26T10:18:11Z")

</div>

In the meanwhile I have discovered that the issue is related to the latest versions of node-red-contrib-opcua. The author of the package is already aware of the problem and will relase a fix in the next version. As another workaround uninstall the current version and install one of the previous ones.  
Hope this helps.

Marzio

---

<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:** [24 August 2026 10:18 UTC](https://discourse.nodered.org/t/node-red-contrib-opcua-write-value-to-server-issue/100636/5 "2026-08-24T10:18:28Z")

</div>

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