# \#opcua

**URL:** https://discourse.nodered.org/tag/opcua/37.md

[Latest](https://discourse.nodered.org/latest.md) · [Categories](https://discourse.nodered.org/categories.md) · [Tags](https://discourse.nodered.org/tags.md)

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## [\[ANNOUNCE\]@vitormnm/node-red-simple-opcua : Creating an OPC UA server without coding](https://discourse.nodered.org/t/announce-vitormnm-node-red-simple-opcua-creating-an-opc-ua-server-without-coding/101152)

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**Author:** [@vitormnm](https://discourse.nodered.org/u/vitormnm)\
**Replies:** 0\
**Last updated:** [28 May 2026 22:48 UTC](https://discourse.nodered.org/t/announce-vitormnm-node-red-simple-opcua-creating-an-opc-ua-server-without-coding/101152 "2026-05-28T22:48:49Z")

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I created this node because I needed to create OPC UA servers in a simple and quick way to perform some validation tests, mainly with methods, alarms, and events. The available alternatives were difficult to manage or c…

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## [OPC UA Event Subscription Lost After Network Disconnection – Need Guidance on Reconnection Strategy](https://discourse.nodered.org/t/opc-ua-event-subscription-lost-after-network-disconnection-need-guidance-on-reconnection-strategy/101139)

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**Author:** [@sauvagenicolas](https://discourse.nodered.org/u/sauvagenicolas)\
**Replies:** 0\
**Last updated:** [27 May 2026 09:40 UTC](https://discourse.nodered.org/t/opc-ua-event-subscription-lost-after-network-disconnection-need-guidance-on-reconnection-strategy/101139 "2026-05-27T09:40:48Z")

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Hello, I am currently developing a data acquisition system using Node-RED with the node-red-contrib-opcua library to connect to an injection moulding machine via OPC UA (EUROMAP 77 / ENGEL CC300 controller). My goal is…

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## [Node-red-contrib-opcua write value to server issue](https://discourse.nodered.org/t/node-red-contrib-opcua-write-value-to-server-issue/100636)

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**Author:** [@Meloman](https://discourse.nodered.org/u/Meloman)\
**Replies:** 3\
**Last updated:** [26 May 2026 10:18 UTC](https://discourse.nodered.org/t/node-red-contrib-opcua-write-value-to-server-issue/100636 "2026-05-26T10:18:11Z")

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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 ex…

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## [How are you managing OPC UA across hundreds of devices?](https://discourse.nodered.org/t/how-are-you-managing-opc-ua-across-hundreds-of-devices/100860)

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**Author:** [@sumitshinde-84](https://discourse.nodered.org/u/sumitshinde-84)\
**Replies:** 0\
**Last updated:** [28 April 2026 10:00 UTC](https://discourse.nodered.org/t/how-are-you-managing-opc-ua-across-hundreds-of-devices/100860 "2026-04-28T10:00:25Z")

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Asking because we have a webinar on exactly this — today at 11am ET with Etienne Rossignon, the creator of NodeOPCUA. He'll be walking through how to handle secure connections, certificate management, and scaling deploym…

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## [node-red-contrib-opcua – Value and timestamp do not update after write](https://discourse.nodered.org/t/node-red-contrib-opcua-value-and-timestamp-do-not-update-after-write/100492)

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**Author:** [@Muntliger](https://discourse.nodered.org/u/Muntliger)\
**Replies:** 4\
**Last updated:** [27 March 2026 19:21 UTC](https://discourse.nodered.org/t/node-red-contrib-opcua-value-and-timestamp-do-not-update-after-write/100492 "2026-03-27T19:21:27Z")

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Hi, I am using node-red-contrib-opcua and following the example flow from here: The server starts correctly and I can connect with UaExpert without any problems. Browsing works and I can see the variables. However, w…

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## [OPCUA stuck at connecting](https://discourse.nodered.org/t/opcua-stuck-at-connecting/99906)

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**Author:** [@Vignesh21](https://discourse.nodered.org/u/Vignesh21)\
**Replies:** 0\
**Last updated:** [9 December 2025 16:56 UTC](https://discourse.nodered.org/t/opcua-stuck-at-connecting/99906 "2025-12-09T16:56:19Z")

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Hi, Experrts need your help, I have problem with OPCUA node, stuck at connecting, This happens when OPC UA server is restarted . this is my flow, can you please advise on how to fix it. ( i dont use any certificates)

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## [ReadMultiple node-red-contrib-opcua-client](https://discourse.nodered.org/t/readmultiple-node-red-contrib-opcua-client/99797)

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**Author:** [@Frittos](https://discourse.nodered.org/u/Frittos)\
**Replies:** 0\
**Last updated:** [28 November 2025 15:09 UTC](https://discourse.nodered.org/t/readmultiple-node-red-contrib-opcua-client/99797 "2025-11-28T15:09:04Z")

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Hi everyone, For a project, I’d like to read multiple values simultaneously from an OPC UA server. To do this, I’m using the node-red-contrib-opcua-client package. Usually, I use the subscribe option of the OPC UA node…

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## [OPCA UA problem with autostarting](https://discourse.nodered.org/t/opca-ua-problem-with-autostarting/99216)

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**Author:** [@mbb](https://discourse.nodered.org/u/mbb)\
**Replies:** 8\
**Last updated:** [3 October 2025 08:28 UTC](https://discourse.nodered.org/t/opca-ua-problem-with-autostarting/99216 "2025-10-03T08:28:52Z")

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Hello I'm still new to node red - i have such a problem. I've created the flow that is working fine but - after power restart of my revice( raspberry ) im automatically starting the nodered but then im in such a state …

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## [Alternative node for OPC UA Compact Server](https://discourse.nodered.org/t/alternative-node-for-opc-ua-compact-server/97528)

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**Author:** [@Manikandan](https://discourse.nodered.org/u/Manikandan)\
**Replies:** 17\
**Last updated:** [15 August 2025 11:48 UTC](https://discourse.nodered.org/t/alternative-node-for-opc-ua-compact-server/97528 "2025-08-15T11:48:33Z")

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Hi, I was using ' OPC UA Compact Server' in one of my Project, this project was handover two year ago. Recently i was trying update OS of the image and stared updating my node-red application to it's latest nodes and f…

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## [Invalid endpoint message when using Node-Red-contribut-opcua](https://discourse.nodered.org/t/invalid-endpoint-message-when-using-node-red-contribut-opcua/97449)

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**Author:** [@enginebeat](https://discourse.nodered.org/u/enginebeat)\
**Replies:** 2\
**Last updated:** [29 July 2025 20:21 UTC](https://discourse.nodered.org/t/invalid-endpoint-message-when-using-node-red-contribut-opcua/97449 "2025-07-29T20:21:46Z")

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Hi All, Trying to use Node-red-contribut-opcua, but I get the invalid endpoint message. both my Twincat and UAExpert connect no problem and also tried the palette opcua/for-node-red and that seems to work fine, so I'm a…

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## [How do I declare an array element in OpcUa-Item node](https://discourse.nodered.org/t/how-do-i-declare-an-array-element-in-opcua-item-node/97209)

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**Author:** [@kapparice](https://discourse.nodered.org/u/kapparice)\
**Replies:** 0\
**Last updated:** [22 May 2025 13:15 UTC](https://discourse.nodered.org/t/how-do-i-declare-an-array-element-in-opcua-item-node/97209 "2025-05-22T13:15:27Z")

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Hi All, I am new to node-red and I am developing a simulation environment for a PLC using OPC-UA. I added some values to the OPCUA server in the PLC, and tested them in UAExpert Client: One of them is a boolean, to ena…

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## [Open source OPC UA node](https://discourse.nodered.org/t/open-source-opc-ua-node/96895)

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**Author:** [@RamaDevi](https://discourse.nodered.org/u/RamaDevi)\
**Replies:** 1\
**Last updated:** [5 May 2025 11:21 UTC](https://discourse.nodered.org/t/open-source-opc-ua-node/96895 "2025-05-05T11:21:56Z")

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Let me know open source OPC UA modules in node-red.

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## [Node: msg.payload msg.payload : undefined](https://discourse.nodered.org/t/node-msg-payload-msg-payload-undefined/96380)

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**Author:** [@lidia](https://discourse.nodered.org/u/lidia)\
**Replies:** 13\
**Last updated:** [21 April 2025 15:08 UTC](https://discourse.nodered.org/t/node-msg-payload-msg-payload-undefined/96380 "2025-04-21T15:08:42Z")

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Hi, I'm testing node red and I've created a signal called data from the prosys server, and I've connected it to this client, but I don't know why it doesn't read the number value. It detects the message but tells me: nod…

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## [Warning : ClientSessionKeepAliveManager#ping\_server Invalid Channel after performing transaction on ReadRequest](https://discourse.nodered.org/t/warning-clientsessionkeepalivemanager-ping-server-invalid-channel-after-performing-transaction-on-readrequest/96561)

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**Author:** [@mrStark](https://discourse.nodered.org/u/mrStark)\
**Replies:** 0\
**Last updated:** [14 April 2025 10:40 UTC](https://discourse.nodered.org/t/warning-clientsessionkeepalivemanager-ping-server-invalid-channel-after-performing-transaction-on-readrequest/96561 "2025-04-14T10:40:18Z")

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Whenever the connection drops, due to maybe network issue or opcua server restarts; after restart the connection doesn't happens automatically until we manually redeploy the flow. Getting below error in logs: 21:48:55.…

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## [OPCU UA Server on Alpine-linux](https://discourse.nodered.org/t/opcu-ua-server-on-alpine-linux/96113)

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**Author:** [@olab](https://discourse.nodered.org/u/olab)\
**Replies:** 3\
**Last updated:** [20 March 2025 20:37 UTC](https://discourse.nodered.org/t/opcu-ua-server-on-alpine-linux/96113 "2025-03-20T20:37:44Z")

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Hi, The last couple og weeks I've had a fight with Node Red and so far I'm the one loosing. I'm trying to set up OPC ua server in NR with no luck on Alpine-linux. Installations runs fine but when I try the sample flow…

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## [Why is browseName included in NodeId when adding OPC-UA variables in Node-RED?](https://discourse.nodered.org/t/why-is-browsename-included-in-nodeid-when-adding-opc-ua-variables-in-node-red/96080)

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**Author:** [@Meloman](https://discourse.nodered.org/u/Meloman)\
**Replies:** 0\
**Last updated:** [18 March 2025 06:21 UTC](https://discourse.nodered.org/t/why-is-browsename-included-in-nodeid-when-adding-opc-ua-variables-in-node-red/96080 "2025-03-18T06:21:18Z")

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I'm using Node-RED to create an OPC-UA structure dynamically. Everything is working fine, but I noticed that the browseName is being appended to the NodeId when adding variables. Here is how I'm adding a variable: mes…

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## [Node creating new message, so losing properties](https://discourse.nodered.org/t/node-creating-new-message-so-losing-properties/95827)

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**Author:** [@mayswekkie](https://discourse.nodered.org/u/mayswekkie)\
**Replies:** 2\
**Last updated:** [6 March 2025 14:13 UTC](https://discourse.nodered.org/t/node-creating-new-message-so-losing-properties/95827 "2025-03-06T14:13:44Z")

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Hey all I want to use the node-red-contrib-opcua module to read multiple tags at once using the opc ua client node (action: READ MULTIPLE). The problem with this node is that for this action it constructs a new msg inst…

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## [OPC Communication](https://discourse.nodered.org/t/opc-communication/95789)

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**Author:** [@Mysmoo](https://discourse.nodered.org/u/Mysmoo)\
**Replies:** 22\
**Last updated:** [5 March 2025 11:36 UTC](https://discourse.nodered.org/t/opc-communication/95789 "2025-03-05T11:36:26Z")

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Hey, I am new to Node-Red and trying to learn. What i am trying to do is read 6 signals from the OPC. I send then with a Join block and read them out in array. Code looks like this after the Join block: let msg1 = {}…

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## [Client\_session\_keepalive\_manag:122 warning : ClientSessionKeepAliveManager#ping\_server Invalid Channel after performing transaction on ReadRequest](https://discourse.nodered.org/t/client-session-keepalive-manag-122-warning-clientsessionkeepalivemanager-ping-server-invalid-channel-after-performing-transaction-on-readrequest/95606)

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**Author:** [@gautamt572](https://discourse.nodered.org/u/gautamt572)\
**Replies:** 0\
**Last updated:** [24 February 2025 10:08 UTC](https://discourse.nodered.org/t/client-session-keepalive-manag-122-warning-clientsessionkeepalivemanager-ping-server-invalid-channel-after-performing-transaction-on-readrequest/95606 "2025-02-24T10:08:00Z")

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Hi I'm facing below issue in one of the nodered flow where we are fetching data from OPCUA server. Sometimes the data flow stops suddenly and gives below error. It doesnt start until we manual restart the flow,Could you…

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## [Convert data from OPC UA to OPC DA](https://discourse.nodered.org/t/convert-data-from-opc-ua-to-opc-da/95519)

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**Author:** [@zalkinac22](https://discourse.nodered.org/u/zalkinac22)\
**Replies:** 0\
**Last updated:** [19 February 2025 13:47 UTC](https://discourse.nodered.org/t/convert-data-from-opc-ua-to-opc-da/95519 "2025-02-19T13:47:13Z")

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Dear community, Is it possible to use this for converting data from OPC UA to OPC DA? I have to receive data to historian, which are coming with OPC UA, and historian can read with OPC DA. Thanks.

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## [Node-red-contrib-opcua : getting unkown error "TypeError: crypto\_utils.readCertificate is not a function"](https://discourse.nodered.org/t/node-red-contrib-opcua-getting-unkown-error-typeerror-crypto-utils-readcertificate-is-not-a-function/95213)

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**Author:** [@YannickRAKOTO](https://discourse.nodered.org/u/YannickRAKOTO)\
**Replies:** 0\
**Last updated:** [7 February 2025 14:13 UTC](https://discourse.nodered.org/t/node-red-contrib-opcua-getting-unkown-error-typeerror-crypto-utils-readcertificate-is-not-a-function/95213 "2025-02-07T14:13:47Z")

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Hello everyone, I'm trying to retrieve datas from my OPC UA Server. For that I'm deploying a flow on node-RED with the OPC UA client (from Node-red-contrib-opcua) to establish a connexion through my opc-UA server. I've c…

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## [Change label for OPC UA-Item](https://discourse.nodered.org/t/change-label-for-opc-ua-item/95010)

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**Author:** [@d3rpy\_f1sh](https://discourse.nodered.org/u/d3rpy_f1sh)\
**Replies:** 2\
**Last updated:** [6 February 2025 19:15 UTC](https://discourse.nodered.org/t/change-label-for-opc-ua-item/95010 "2025-02-06T19:15:52Z")

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Hello, I am reading in values from Kepware and then joining the response into a key/value object. How do I rename the keys from msg.topic to a custom label I assign? Thanks

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## [OPCUA Client on Debian Linux -- server Cert Path?](https://discourse.nodered.org/t/opcua-client-on-debian-linux-server-cert-path/94657)

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**Author:** [@slh](https://discourse.nodered.org/u/slh)\
**Replies:** 0\
**Last updated:** [15 January 2025 21:50 UTC](https://discourse.nodered.org/t/opcua-client-on-debian-linux-server-cert-path/94657 "2025-01-15T21:50:27Z")

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I am using node-red-contrib-opcua (latest) to make a simple flow involving OPCClient. When run on a Windows machine, my flow works as expected (connects to remote OPC server, subscribes, etc). When I deploy the same fl…

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## [Impossible de lire une variable opcua. msg.payload : undefined](https://discourse.nodered.org/t/impossible-de-lire-une-variable-opcua-msg-payload-undefined/94384)

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**Author:** [@Baba288](https://discourse.nodered.org/u/Baba288)\
**Replies:** 6\
**Last updated:** [7 January 2025 11:32 UTC](https://discourse.nodered.org/t/impossible-de-lire-une-variable-opcua-msg-payload-undefined/94384 "2025-01-07T11:32:36Z")

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Bonjour, je suis débutant sur nodered et je cherche à lire une variable string sur un serveur opcua créer sur un automate pc embarqué beckoff. J'ai un rasberry pi 3 et nodered v4.06. J'ai bien créer le serveur et j'ai r…

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## [Problem using node-red-contrib-opcua](https://discourse.nodered.org/t/problem-using-node-red-contrib-opcua/93460)

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**Author:** [@gfattal](https://discourse.nodered.org/u/gfattal)\
**Replies:** 4\
**Last updated:** [10 December 2024 20:28 UTC](https://discourse.nodered.org/t/problem-using-node-red-contrib-opcua/93460 "2024-12-10T20:28:29Z")

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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 w…

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## [OPCUA unable to execute addFolder opcuAcommand](https://discourse.nodered.org/t/opcua-unable-to-execute-addfolder-opcuacommand/92918)

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**Author:** [@Meloman](https://discourse.nodered.org/u/Meloman)\
**Replies:** 14\
**Last updated:** [7 November 2024 06:53 UTC](https://discourse.nodered.org/t/opcua-unable-to-execute-addfolder-opcuacommand/92918 "2024-11-07T06:53:00Z")

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Hi, I use some nodes to create an OPC-UA Server which reflect all live data of the machine. It works fine on some computers but today, same code on a new Windows 11 Pro computer doesn't work anymore. Here is executed c…

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## [mySQL datatable to OPC UA server using node-red](https://discourse.nodered.org/t/mysql-datatable-to-opc-ua-server-using-node-red/92460)

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**Author:** [@skibidifanuc](https://discourse.nodered.org/u/skibidifanuc)\
**Replies:** 2\
**Last updated:** [18 October 2024 06:48 UTC](https://discourse.nodered.org/t/mysql-datatable-to-opc-ua-server-using-node-red/92460 "2024-10-18T06:48:31Z")

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Hey! I'm struggling to send an array of extension objects through from mySQL to an OPC server. When I send values manually (for example I send 3 to point\[3\].fuseType) it works but I always struggle with the array. The p…

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## [Node-RED crash after write boolean to CPU1500 OPC UA](https://discourse.nodered.org/t/node-red-crash-after-write-boolean-to-cpu1500-opc-ua/91107)

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**Author:** [@Michal](https://discourse.nodered.org/u/Michal)\
**Replies:** 2\
**Last updated:** [20 September 2024 06:19 UTC](https://discourse.nodered.org/t/node-red-crash-after-write-boolean-to-cpu1500-opc-ua/91107 "2024-09-20T06:19:04Z")

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Hi I have Node-RED version 4.0.3 and CPU Siemens 1518F-4 PN/DP with OPC UA server. After exporting data from PLC to CSV, I want to write one bool in the plc that the export was successful created and then I could delet…

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## [Node-red OPCUA compact Server](https://discourse.nodered.org/t/node-red-opcua-compact-server/89778)

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**Author:** [@enginebeat](https://discourse.nodered.org/u/enginebeat)\
**Replies:** 0\
**Last updated:** [26 July 2024 06:16 UTC](https://discourse.nodered.org/t/node-red-opcua-compact-server/89778 "2024-07-26T06:16:33Z")

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Hi All, On my project I need to implement a OPCUA server. I started by having a look at the server supplied on the node-red-contrib-opcua pallete, but then I saw that the examples I found were using the compact server …

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## [OPCUA Read-Multiple Outputs Single Message](https://discourse.nodered.org/t/opcua-read-multiple-outputs-single-message/89731)

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**Author:** [@nathan1](https://discourse.nodered.org/u/nathan1)\
**Replies:** 1\
**Last updated:** [24 July 2024 19:41 UTC](https://discourse.nodered.org/t/opcua-read-multiple-outputs-single-message/89731 "2024-07-24T19:41:05Z")

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Hello, I am trying to get the message from OPCUA Client to output the values on a single msg. Is there a way to do this?

[Next page](https://discourse.nodered.org/tag/opcua/37.md?match_all_tags=true&page=1&tags%5B%5D=opcua)