234-0002

Inspect physical connections

Check all Ethernet cables connected to the TNC control's HSCI port (typically X116) for damage, proper seating, and secure connections.

Power down the TNC control before disconnecting/reconnecting Ethernet cables to prevent damage.

Test cable continuity

Use a cable tester or substitute with a known good Ethernet cable to verify cable integrity between TNC and network devices.

Industrial environments often cause cable fatigue - check for kinks or crushing near cable management areas.

Verify LED indicators

Check the Ethernet port LEDs on both TNC control and connected devices - green should indicate link, amber/orange indicates activity.

No LED activity usually indicates physical layer failure rather than protocol issues.

Access network configuration

Press MOD key, navigate to System → Network Configuration to access Ethernet settings for HSCI interface.

Document current settings before making changes for easy rollback if needed.

Verify IP configuration

Check IP address (typically 192.168.x.x), subnet mask (usually 255.255.255.0), and gateway settings match your network infrastructure requirements.

Ensure IP address doesn't conflict with other network devices to prevent communication errors.

Test network connectivity

Use the TNC's built-in ping function in MOD → System → Network → Diagnostics to test connectivity to gateway and target devices.

Start with pinging the gateway first, then target devices to isolate where communication fails.

Check hardware diagnostics

Navigate to MOD → System → Hardware Diagnostics → Communication Interfaces to view HSCI module status and error counters.

Look for excessive error counts or 'Not Ready' status indicators for the HSCI module.

Perform hardware reset

Power cycle the TNC control completely (not just soft reset) to reinitialize the HSCI hardware interface.

Ensure all programs are saved and machine is in safe position before power cycling.

Verify module seating

If HSCI is a separate card, power down and reseat the communication module in its slot, ensuring proper connector engagement.

Only qualified technicians should remove/install internal modules - ESD precautions required.

Test switch port functionality

Connect a laptop or other device to the same switch port used by the TNC to verify the network infrastructure is operational.

Use a device with known good network configuration to isolate TNC-specific vs. infrastructure issues.

Check switch configuration

Verify network switch settings including VLAN configuration, port speed/duplex settings, and any security restrictions that might block TNC communication.

Document switch settings before making changes - incorrect VLAN settings can isolate the TNC from network resources.

Verify power and status LEDs

Check all network infrastructure devices for proper power, link status, and activity LEDs to identify failed components in the communication path.

Industrial switches often have port-specific LED indicators - a dark LED usually indicates port or cable failure.