Applicable Systems
TwinCAT NC
Symptoms
ADS (Automation Device Specification) server not started or not responding; TwinCAT communication may be limited.
Possible Causes
- TwinCAT runtime not started
- ADS port conflict with another application
- TwinCAT service configuration error
Troubleshooting Steps
- Step 1: Check TwinCAT System Manager for runtime status
TwinCAT runtime running - Step 2: Restart TwinCAT runtime via System Manager
Runtime starts, ADS available - Step 3: Check ADS port settings (default 801, 301, 501)
Ports not conflicting - Step 4: Restart PC if service restart fails
ADS server starts after reboot - Step 5: Verify ADS communication from client (e.g., HMI)
Client connects to ADS
How to Reset
Restart TwinCAT runtime via System Manager; clear ADS error.
Frequently Asked Questions
- Q: What is ADS?
Automation Device Specification - Beckhoff's communication protocol for TwinCAT. Used for HMI, programming, and inter-process communication. Default ADS ports: 801 (PLC), 301 (NC), 501 (System).
Source: Beckhoff TwinCAT 2 Error Codes Manual
Category: PLC & VFD