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Heidenhain Controller
Servo/Axis · Intermediate · 30-120 minutes
HEIDENHAIN 231-C5F0 - C5F0 Wrong position-encod. input
Alarm 231-C5F0 occurs when the posEncoderInput parameter references an invalid encoder input connector that doesn't match the actual hardware configuration or available encoder inputs on the CC424/CC61xx control cards. This typically happens after hardware changes, parameter modifications, or incorrect axis configuration.
231-C5F0
HEIDENHAIN 231-C5F0 - C5F0 Wrong position-encod. input
C5F0 Wrong position-encod. input
An invalid input was selected for the position encoder via the posEncoderInput parameter. The allowed input depends on the controller type and the number of control loops; the PWM output must match the assigned encoder input.
Root Cause Summary
Alarm 231-C5F0 occurs when the posEncoderInput parameter references an invalid encoder input connector that doesn't match the actual hardware configuration or available encoder inputs on the CC424/CC61xx control cards. This typically happens after hardware changes, parameter modifications, or incorrect axis configuration.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access Machine Parameters
Navigate to MOD > Machine Parameters > Axes > [Affected Axis] and locate the posEncoderInput parameter.
Use Ctrl+F to quickly search for 'posEncoderInput' in the parameter list
- 2
Verify Hardware Configuration
Check the actual CC424 control card configuration and count available encoder inputs (6, 8, 10, 12, 14, or 16 loops) against the parameter setting.
Ensure machine is in safe state before opening electrical cabinet
- 3
Correct Parameter Value
Set posEncoderInput to a valid encoder input within the available range (e.g., X201-X206 for 6-loop configuration).
Document the change in the machine logbook for future reference
- 4
Restart Control
Perform a complete TNC restart to activate the parameter changes and clear the alarm.
Call a technician if:
- ·Hardware card replacement required
- ·Multiple axes affected with unknown configuration
- ·Parameter changes cause additional alarms
Prevention
- Always backup parameters before hardware changes
- Document encoder input assignments
- Verify hardware configuration before parameter imports
Common Mistakes
- Assuming all CC424 cards have same configuration
- Not updating parameters after card replacement
- Copying parameters between different machine configurations
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