220-001B

Check Network Interface Status

Navigate to MOD function → System Info → Network Status and verify Ethernet interface X116 shows 'Connected' status with valid IP configuration.

Look for packet loss counters or error statistics in the network diagnostics

Reset Network Interface

Access Setup → General → Network Settings, disable and re-enable the Ethernet interface, then restart the TNC control completely.

Save all active programs before restarting the control

Verify Cable Connections

Check physical Ethernet cable connection at X116 connector and verify network switch/router connectivity with ping test from TNC terminal.

Use TNC's built-in ping utility in MOD function → System → Network Tools

Check Network Parameters

Verify MP7200 (Network Configuration) parameters match your network requirements and MP7210 (IP Address) is not conflicting with other devices.

Check PLC Cycle Time

Navigate to PLC → Diagnostics → Cycle Time and verify PLC cycle time is below 10ms. Values above 20ms indicate PLC overload.

Look for PLC program loops or excessive timer functions causing delays

Review PLC Error Messages

Access PLC → Error Messages and check for any active PLC communication errors or I/O module faults that could block message queues.

Do not clear PLC errors without understanding their root cause

Restart PLC System

Execute PLC → Control → Stop PLC, wait 5 seconds, then Start PLC to clear communication queues and reinitialize message handling.

Monitor the PLC startup sequence for any initialization errors

Check I/O Module Status

Verify all configured I/O modules in Setup → I/O Configuration are responding properly and no modules show communication timeouts.

Check System Memory Usage

Navigate to MOD function → System Info → Memory Usage and verify available RAM is above 20% and swap usage is below 50%.

High swap usage indicates insufficient physical memory for current operations

Clear Temporary Files

Access File Management → TNC:\ and delete unnecessary .tmp files, old backup files, and clear the recycle bin to free system resources.

Only delete files you can identify as temporary or backup files

Restart Control System

Perform a complete control restart to reinitialize all system memory allocations and clear any memory leaks or stuck processes.

Allow the system to fully boot before loading any programs or starting operations

Review Active Processes

Check MOD function → System → Process List for any hung or high-memory consuming processes that may be preventing proper queue management.

Check LSV2 Connection Status

Navigate to Setup → General → LSV2 Settings and verify MP7600 (LSV2 Enable) is set correctly and no unauthorized connections are active.

Look for multiple simultaneous LSV2 connections which can cause queue conflicts

Reset LSV2 Interface

Disable LSV2 communication by setting MP7600=0, restart the control, then re-enable by setting MP7600=1 to clear all LSV2 queues.

This will disconnect all external DNC or monitoring software temporarily

Verify External Software

Check that any connected DNC software, monitoring systems, or data collection tools are properly disconnecting from the TNC rather than timing out.

Configure external software with proper timeout values and connection retry logic