# Problems connecting Node-RED to TwinCAT 3 (ADS connection errors)

**URL:** https://discourse.nodered.org/t/problems-connecting-node-red-to-twincat-3-ads-connection-errors/101377
**Category:** Dashboard
**Created:** [29 June 2026 13:44 UTC](https://discourse.nodered.org/t/problems-connecting-node-red-to-twincat-3-ads-connection-errors/101377 "2026-06-29T13:44:15Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![raphi](https://avatars.discourse-cdn.com/v4/letter/r/82dd89/32.png) [@raphi](https://discourse.nodered.org/u/raphi)
#### Post date: [29 June 2026 13:44 UTC](https://discourse.nodered.org/t/problems-connecting-node-red-to-twincat-3-ads-connection-errors/101377/1 "2026-06-29T13:44:15Z")

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Hello everyone,

I'm currently having problems connecting Node-RED to my Beckhoff PLC running TwinCAT 3.

I have already contacted Beckhoff support, but unfortunately they were not able to help me solve the issue. Therefore, I'm hoping someone here might have an idea.

When I try to establish the connection from Node-RED to TwinCAT, I receive multiple error messages (see the attached screenshots). The connection cannot be established.

My setup:

- PLC: Beckhoff with TwinCAT 3
- Node-RED running on a separate PC
- ADS communication

I have attached:

1. Screenshots of the error messages from Node-RED.
2. A screenshot of the TwinCAT route/IP configuration on the Beckhoff controller.

Has anyone experienced similar issues or knows what could be causing this? Is there anything specific I should check regarding the AMS Net IDs, ADS routes, firewall settings, or Node-RED configuration?

Any suggestions would be greatly appreciated.

Thank you!

 ![IMG_8520](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/0/9/099dc73c58d7efcaa576b94d6ddf0976c8a01463.jpeg)  
 ![Screenshot 2026-06-29 153025](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/d/6de61c2c9edb19b1833d230e00d6835f0e479145.png)  
 ![Screenshot 2026-06-29 153047](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/9/4/94fe74946f93b0a23d556dbb7a950d82486515c5.png)

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<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: [29 July 2026 13:44 UTC](https://discourse.nodered.org/t/problems-connecting-node-red-to-twincat-3-ads-connection-errors/101377/2 "2026-07-29T13:44:39Z")

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