235-008D

Check HSCI device inventory

Access MOD function → System Info → HSCI Status to view all connected HSCI devices and their supported data rates.

Look for device firmware dates - anything before 2015 likely supports only 100 Mbit/s

Identify incompatible devices

Document devices showing 100 Mbit/s capability versus those requiring 1 Gbit/s operation in the HSCI network topology.

Do not disconnect HSCI devices while system is powered - always shut down TNC first

Upgrade or replace legacy devices

Update firmware on older HSCI devices or replace with 1 Gbit/s compatible versions to achieve uniform data rate capability.

Check with Heidenhain for firmware upgrade availability before purchasing new hardware

Verify HSCI network configuration

Power cycle TNC and verify all HSCI devices initialize at 1 Gbit/s in System Info → HSCI Status display.

Inspect HSCI cable connections

Visually examine all HSCI cable connectors for corrosion, bent pins, or physical damage that could affect signal quality.

Always power down TNC before disconnecting HSCI cables to prevent data corruption

Test cable continuity

Use appropriate test equipment to verify HSCI cable integrity and signal quality, particularly for cables longer than 5 meters.

HSCI cables over 10 meters may require signal boosters for reliable 1 Gbit/s operation

Replace suspect cables

Install new HSCI cables meeting Heidenhain specifications for 1 Gbit/s operation, ensuring proper shielding and connector quality.

Use only Heidenhain-approved HSCI cables to ensure compatibility and performance

Verify network performance

Monitor HSCI Status in System Info to confirm all devices achieve and maintain 1 Gbit/s data rates after cable replacement.

Review HSCI network topology

Document current HSCI device connection sequence and compare against Heidenhain recommended topology for mixed-speed networks.

Group devices by data rate capability when possible to minimize speed negotiation conflicts

Check MP7300 configuration

Access machine parameters and verify MP7300 (HSCI configuration) settings match the actual network topology and device capabilities.

Incorrect MP7300 settings can cause permanent HSCI communication failures

Reconfigure device sequence

Rearrange HSCI devices to optimize data flow, placing 1 Gbit/s devices in dedicated network segments where possible.

Use HSCI switches or hubs to create separate high-speed segments for critical devices

Update network parameters

Modify MP7300 series parameters to reflect new topology and force 1 Gbit/s operation where supported by all connected devices.

Check TNC software version

Access MOD function → System Info → Software to verify current TNC software version and build date.

HSCI 1 Gbit/s support was introduced in TNC software version 340.49x series

Review software compatibility matrix

Consult Heidenhain documentation to verify current software version supports mixed HSCI data rate operation with your specific device combination.

Software updates may require machine parameter backup and restoration

Update TNC software

Install latest compatible TNC software version that includes improved HSCI data rate negotiation algorithms.

Always backup machine parameters and part programs before software updates

Reconfigure HSCI parameters

After software update, reset and reconfigure HSCI network parameters to take advantage of improved data rate management features.