234-0009

Access IO configuration

Navigate to Setup > General > CfgProgrammableLogic > IO Configuration to review all configured HSCI devices.

Use Ctrl+F to search for 'HSCI' entries quickly in the configuration tree.

Count active HSCI nodes

Document all HSCI devices including encoders, probes, and auxiliary axes. Check MP7440 (max HSCI devices) against actual count.

Do not modify MP7440 without consulting Heidenhain documentation for your specific TNC model.

Prioritize essential devices

Disable non-critical HSCI devices by setting their configuration status to 'inactive' in CfgProgrammableLogic.

Start with auxiliary measurement systems or redundant probing devices that aren't actively used.

Restart control system

Perform a complete TNC restart to reinitialize the HSCI communication with the reduced device count.

Check EnDat configuration

Review Setup > NC > Channel > Axis > Position measurement for all axes and verify MP6510 (EnDat telegram rate) settings.

Default MP6510 should be 0 (automatic) unless specifically required otherwise.

Analyze encoder telegram frequency

Access Diagnostics > HSCI > Telegram Monitor to observe real-time HSCI traffic and identify high-frequency sources.

High telegram rates can indicate failing encoders or incorrect MP6510 settings.

Optimize EnDat parameters

Reduce MP6510 values for non-critical axes or set to automatic mode. Consider increasing MP6511 (EnDat timeout) if needed.

Rotary axes typically need lower telegram rates than linear positioning axes.

Verify encoder health

Use Setup > Diagnose > Position measurement to check EnDat encoder status and error counters for each axis.

Verify HSCI addressing

Check Setup > General > CfgProgrammableLogic for duplicate HSCI addresses in the device configuration tree.

Each HSCI device must have a unique address - use the address overview function to identify conflicts.

Inspect physical HSCI connections

Verify proper HSCI bus termination and check for loose connections that could cause signal reflections.

Always power down the TNC before checking HSCI cable connections.

Reset HSCI bus configuration

Use Setup > Diagnose > HSCI > Bus Reset to clear any stuck telegrams or communication errors.

Perform this reset during a maintenance window as it will temporarily interrupt all HSCI communications.

Monitor telegram flow

Use Diagnostics > HSCI > Traffic Analysis to confirm normal telegram patterns after addressing corrections.

Identify problematic device

Access Setup > Diagnose > HSCI > Device Status to identify devices with high error counts or continuous transmission.

Look for devices showing 'Communication Error' or abnormally high telegram counters.

Isolate suspect device

Temporarily disable the suspect device in CfgProgrammableLogic and monitor if alarm 234-0009 clears.

Disabling critical measurement devices will affect machine operation - coordinate with production.

Perform device diagnostics

Use the specific diagnostic functions for the identified device type (encoder test, probe calibration, etc.) to verify functionality.

Document error patterns before replacing hardware - this helps with warranty claims.

Replace or reconfigure device

Either replace the faulty HSCI device or adjust its configuration parameters to reduce telegram frequency if hardware is functional.