Code 231-9320: Position encoder: EnDat 2.2 not possible %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Position encoder: EnDat 2.2 not possible %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] - EnDat communication is defective - An encoder with EnDat 2.2 interface is selected in machine parameter posEncoderType or motEncTyp, although no EnDat 2.2 encoder is connected. - The EnDat 2.2 protocol cannot be read [Error correction] - Check whether the position encoder supports EnDat 2.2 - Check the machine parameter posEncoderType or motEncTyp - Check the cable ground and shield - Exchange the motor control board - Check the cable (compare the cable ID number with the documentation) - Check the position encoder cable (defective or too long) - Check the position encoder - Inform your service agency 10/2023 [441]
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 231-9320 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.
Have a better solution?
Help the industrial community by sharing your repair experience for code 231-9320.
Need a searchable reference for more Heidenhain TNC Series CNC manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026