230-0471

Access IOC Configuration

Navigate to MOD function → System Parameters → IOC Configuration to examine the current IO mapping.

Always backup the current IOC file before making changes

Identify Conflicting Fast Inputs

Search for spindle %2 entries and locate all fast input assignments (typically labeled as FAST_IN or similar designations).

Document all current assignments before modification

Remove Redundant Fast Input

Delete the duplicate fast input assignment, keeping only the primary fast input channel for the spindle.

Verify the remaining fast input matches the actual hardware connection

Validate and Reload IOC

Save the IOC file and perform a control restart to load the corrected configuration.

Control restart required - coordinate with production schedule

Compare IOC with Machine Specification

Cross-reference the current IOC file against the original machine documentation and electrical schematics.

Check the machine serial number and model to ensure correct IOC template

Verify Hardware Configuration

Physically inspect the spindle encoder connections and fast input wiring to confirm actual hardware setup.

Power down before inspecting electrical connections

Rebuild IOC Section

Recreate the spindle fast input section using the correct machine-specific parameters and single fast input assignment.

Use Heidenhain's IOC configuration tool for validation

Test Spindle Operation

After IOC reload, verify spindle speed feedback and positioning functions operate correctly.

Test at low speeds initially to verify proper operation

Check Software Version History

Review recent TNC software updates and identify when the alarm first appeared using the error log.

Access error log via MOD → System Info → Error Log

Restore Previous IOC Backup

If available, restore the IOC configuration from backup taken before the software update.

Ensure backup compatibility with current TNC software version

Manual IOC Correction

If no backup exists, manually edit the IOC file to remove duplicate fast input assignments for spindle %2.

Use text editor with syntax highlighting for IOC file editing

Validate Parameter Consistency

Cross-check all spindle-related parameters in machine parameters against the corrected IOC configuration.

Inconsistent parameters can cause additional alarms

Review Recent Configuration Changes

Check the TNC modification log to identify recent IOC configuration changes and who made them.

Access via MOD → System Info → Modification Log

Audit Complete IOC Structure

Perform comprehensive review of entire IOC file to identify any other potential duplicate or incorrect assignments.

Look for patterns that might indicate systematic configuration errors

Correct Fast Input Assignment

Remove the erroneous fast input entry while preserving the correct spindle configuration parameters.

Document the correction for future reference and training

Implement Configuration Control

Establish procedures to prevent future manual configuration errors, including change documentation requirements.

Unauthorized IOC changes can cause machine damage