Contact Us

If you still have questions or prefer to get help directly from an agent, please submit a request.
We’ll get back to you as soon as possible.

Please fill out the contact form below and we will reply as soon as possible.

  • Home
  • Knowledge base
  • Contact Us
  • Home
  • Connectors
  • Beckhoff TwinCAT

Beckhoff TwinCAT - Troubleshooting

Troubleshooting of Beckhoff TwinCAT ADS instances and items

Written by Paul Bendixen

Updated at May 30th, 2025

Contact Us

If you still have questions or prefer to get help directly from an agent, please submit a request.
We’ll get back to you as soon as possible.

Please fill out the contact form below and we will reply as soon as possible.

  • Installation & Technical information
    Introduction SIA Connect Standalone SIA Connect ANY-Ware Cellular & WiFi connectivity
  • Configuration in the Web UI
    Getting started with the UI Connectors Instances Items Mapping Data System Network Tools & Add-ons DigiCert IoT Trust Manager Remote Access & VPN tunneling
  • Connectors
    Siemens S7 Azure IoT Ethernet/IP Mitsubishi MELSEC OPC-UA Server SQL MQTT Omron Host Link REST API Omron FINS Keyence Beckhoff TwinCAT BACnet Virtual OPC-UA Client MS SQL File M-Bus Modbus MTConnect Socket Client Socket Server MySQL
  • Scripting & Variables
    Data formatting
  • Developers
    API documentation Shadow API
  • Tutorials & Guides
    InfluxDB AWS IoT Core - Amazon Web Services Microsoft Power BI KaaIoT Siemens S7 AVEVA Insight SIA Connect Demo Rack Grafana Notification & Messaging Azure
  • General
+ More

Table of Contents

Error messages Instance Item

Articles in this section:

  • Beckhoff TwinCAT - Instance & item setup
  • Beckhoff TwinCAT - Troubleshooting
  • Setting up ADS Route in TwinCAT

 

This article will describe some of the most common faults encountered when trying to connect to Beckhoff TwinCAT ADS devices. All the various error messages is also explained here.

 

Error messages

Both instance and items can have errors. These are showed on the portal and the following sections describes the error and how to solve them.

 

Instance

Error message Description Solution
Target port not found   ADS Server not started
 
The IP address is not responding. Check the IP address and that you can ping it. Ensure that SIA is in the same network as the ADS device.
 
Invalid ADS port
 
The ADS port is set incorrectly
 

Check that the ADS port is set correctly. You can find information of ADS and the default ADS ports from Beckhoff's website.

TwinCAT 2 typically default port: 801

TwinCAT 3 typically default port: 851
 

 

 

Item

Error message Description Solution
Symbol not found
 
The symbol was not found in the device
 
Check that you have spelt the name of the variable correctly.
Check that the instance is connected to the correct ADS device
 
Timeout elapsed
 
The item is correct, but reading it took too long time
 
Reduce the number of readings from the device, having the device on SIA Port X2 might also worsen this problem
Same error message on all items
 
This might actually be an error with the Instance
 
Check that your instance is set up correctly and that the ADS port is configured correctly for what the device reports
 
issues beckhoff

Was this article helpful?

Yes
No
Give feedback about this article

Related Articles

  • Beckhoff TwinCAT - Instance & item setup
  • Setting up ADS Route in TwinCAT

0
0
Expand