Code 231-C670: Motor encoder: EnDat 2.2 not possible %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Motor 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 the motor table, although no EnDat 2.2 encoder is connected - The EnDat 2.2 protocol cannot be read - The EnDat measuring system has too low an interpolation rate in EnDat2.2 mode (less than 1024, e.g. EQN 1325). Operation possible only in EnDat2.1 mode [Error correction] - Check whether the encoder supports EnDat 2.2 - Check the motor table (SYS column) - Check the configuration datum motEncType - Check the cable ground and shield - Check the cable (compare the cable ID number with the documentation) - Check the speed encoder cable (defective or too long) - Check the speed encoder - Change EnDat mode (motEncType) - Exchange the motor control board - Inform your service agency
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-C670 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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