Code 236-A101: No contact to ProfiNet end device %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical No contact to ProfiNet end device %1 alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
[Cause of error] The ProfiNet end device does not respond. Possible causes: - Error in project setup - Inconsistent configuration of the ProfiNet end device name - Interrupted connection between TNC and ProfiNet end device - There is a fault in the ProfiNet end device. [Error correction] Check the ProfiNet topology and project setup. Acknowledge the error. 10/2023 [617]
Source: HEIDENHAIN NC Error Messages — TNC7/640/620/320/128, CNC PILOT 640, MANUALplus 620 (10/2023)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Heidenhain TNC Series CNC Alarms
Heidenhain controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 236-A101 on the TNC Series CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Heidenhain's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4497 Heidenhain TNC Series CNC codes.
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