Code 231-C5F0: Wrong position-encod. input
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Wrong position-encod. input 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] - An incorrect input was selected for the position encoder ("posEncoderInput" parameter) - Possible configurations CC424: 6 control loops: X201 to X206 8 control loops: X201 to X208 10 control loops: PWM outputs X51 to X56: X201 to X206 PWM outputs X57 to X60: X207 to X210 12 control loops: PWM outputs X51 to X56: X201 to X206 PWM outputs X59 to X64: X209 to X214 14 control loops: PWM outputs X51 to X58: X201 to X208 PWM outputs X59 to X64: X209 to X214 16 control loops: PWM outputs X51 to X58: X201 to X208 PWM outputs X59 to X66: X209 to X216 - Possible configuration CC61xx: PWM output <-> position encoder X51 <-> X201 X52 <-> X202 X53 <-> X203 X54 <-> X204 X55 <-> X205 X56 <-> X206 [Error correction] - Inform your service agency - Check the configuration datum posEncoderInput
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-C5F0 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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