2A0-0007

Inspect Ethernet Cable Connection

Check the Ethernet cable connected to the X116 (TNC 320/530) or X26 (TNC 620/640) interface on the control. Verify both ends are firmly seated and link LEDs are illuminated on network hardware.

Use Category 5e or better shielded cables for LSV2 connections in industrial environments to prevent EMI interference.

Test Cable Continuity

Replace the Ethernet cable with a known-good cable. Test with a cable tester if available to verify all 8 conductors have continuity and proper pinout (T568A or T568B standard).

Verify Network Switch/Hub Operation

If using a network switch between TNC and PC, verify the switch port link lights are active. Try connecting directly point-to-point between control and PC to isolate switch-related issues.

Verify LSV2 is Enabled

Press MOD key, navigate to System Settings > Communication > LSV2. Ensure 'LSV2 Protocol' is set to ENABLED. Note the configured timeout value (typically 30-60 seconds).

Check IP Configuration

In MOD > System Settings > Network Configuration, verify the TNC IP address, subnet mask, and gateway are correctly configured for your network. The control and PC must be on the same subnet for direct LSV2 communication.

Use static IP addresses for industrial TNC controls rather than DHCP to prevent communication interruptions during IP lease renewal.

Verify TNCremo Version Compatibility

Check the TNCremo version on the PC against the TNC control firmware version. Access Help > About on TNCremo and compare with MOD > System Info > Software Version on the control. Update TNCremo if version mismatch exists.

TNCremo versions more than 2 major releases different from control firmware often have LSV2 protocol incompatibilities.

Test LSV2 Connection

From TNCremo, use Connection > Test Connection to verify LSV2 handshake completes successfully. Observe detailed error messages in TNCremo log file (View > Communication Log).

Verify Windows Firewall Settings

On the PC running TNCremo, open Windows Defender Firewall > Advanced Settings. Check Inbound and Outbound rules for TNCremo.exe. Ensure TCP port 19000 is allowed for both directions.

Create specific firewall rules for TNCremo rather than disabling the firewall entirely for better security.

Test with Firewall Temporarily Disabled

Temporarily disable Windows Firewall on the PC and attempt LSV2 connection again. If alarm clears, the firewall is blocking LSV2 traffic and needs proper rule configuration.

Only disable firewall for testing purposes. Re-enable immediately after testing and configure proper rules.

Check Antivirus Real-Time Protection

Some antivirus software monitors network traffic and can interfere with industrial protocols. Add TNCremo installation folder to antivirus exclusion list or temporarily disable real-time protection for testing.

Check PLC Cycle Time

Press PLC key, then select PLC > Diagnostics > Cycle Time. Verify the current and maximum PLC cycle time. Values consistently above 20-30ms may indicate PLC overload affecting LSV2 communication.

Optimize PLC programs by reducing unnecessary calculations in fast loops and moving complex logic to slower background cycles.

Monitor System Load During LSV2 Transfer

Navigate to MOD > System Diagnostics > CPU Load. Observe CPU utilization during LSV2 file transfers. If CPU load exceeds 85-90%, consider performing transfers during non-production times.