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Access IOCP configuration menu

Press MOD key, select 'System Parameters', navigate to 'Hardware Configuration' menu, then select 'IOCP Configuration'.

Document current IOCP filename before making changes

Verify loaded IOCP file

Check the currently loaded IOCP filename in the configuration display. Compare against machine documentation to ensure correct file is loaded.

Never load an IOCP file without verifying it matches your exact hardware configuration

Load correct IOCP file

If incorrect IOCP is loaded, navigate to 'Load IOCP' function, select the correct .ioc file from TNC:\system\iocp\ directory, and confirm loading.

Always perform a controlled restart after IOCP changes

Perform system restart

Execute a controlled restart via 'System' menu to reinitialize HSCI communication with new IOCP configuration.

Document physical HSCI chain

Record all HSCI devices physically connected: drives, I/O modules, encoders. Note their HSCI addresses (typically set via DIP switches) and serial numbers.

Power down system before inspecting HSCI hardware connections

Compare with IOCP configuration

In TNC 'Hardware Configuration' menu, review configured HSCI devices and compare device types, addresses, and expected serial numbers with physical hardware.

Use HSCI diagnostic display to see detected vs. configured devices

Update IOCP configuration

If hardware changes are intentional, use IOCP Editor to modify configuration file, adding/removing devices and updating addresses to match physical setup.

IOCP modifications require advanced knowledge - contact Heidenhain support if unsure

Validate HSCI addressing

Ensure no duplicate HSCI addresses exist and all addresses are sequential starting from address 1 in the chain.

Backup current configuration

Create backup of current IOCP and machine parameters via 'Data Management' menu before attempting recovery procedures.

Save to external USB device for safety

Reload factory IOCP

Load the original factory IOCP file from TNC:\system\iocp\factory\ directory to establish baseline configuration.

Factory IOCP may not include custom modifications - have original configuration documented

Clear system configuration cache

Access 'System Diagnostics' menu, select 'Clear Configuration Cache' to force TNC to rebuild hardware configuration from IOCP.

This forces complete re-detection of HSCI chain

Perform cold restart

Execute cold restart (power cycle) to completely reinitialize HSCI communication and configuration loading.

Check HSCI cable connections

Inspect all HSCI cables for damage, proper seating, and correct routing. Verify cable continuity and shield connections.

Power down system before disconnecting HSCI cables

Test HSCI communication

Use TNC 'HSCI Diagnostics' menu to test communication to each device. Check for communication errors or timeout messages.

Start testing from first device in chain and work sequentially

Isolate faulty device

If communication errors detected, disconnect devices one by one from end of chain to isolate the faulty component causing communication breakdown.

Always power down before disconnecting HSCI devices

Replace faulty hardware

Replace identified faulty HSCI device, cable, or communication module. Update IOCP if replacement device has different specifications.