245-03F8

Check Available Disk Space

Press MOD key, select 'System Info' and check available space on TNC:\ drive. Minimum 100MB free space required for system operations.

Use file manager (MOD > File Management) to identify large unnecessary files in TNC:\user\ directory

Perform Disk Check

Boot to Windows CE/Embedded and run CHKDSK /F on the TNC drive to repair file system errors and bad sectors.

Always backup critical data before running disk repair utilities

Clean Temporary Files

Delete files in TNC:\temp\ and TNC:\log\ directories, clear alarm log via MOD > Diagnostics > Clear Log Files.

Archive important log files before deletion for future troubleshooting reference

Test Configuration Write

Modify a non-critical machine parameter (MP7440 display brightness) and save to verify write capability is restored.

Check File Attributes

Navigate to TNC:\system\ directory and verify TNC.SYS and *.CFG files are not set to read-only or system-protected attributes.

Use Windows file properties to remove read-only attributes if present

Verify User Access Rights

Ensure current user has administrator privileges. Check MOD > User Management for proper access level (Level 2 minimum required).

Never modify system files without proper backup and authorization

Close Conflicting Applications

Exit all running applications including TNCremo, file transfers, and network connections that may lock configuration files.

Restart TNC Software

Perform soft reset (CTRL+ALT+DEL) to release any file locks and reinitialize the TNC system processes.

Check Network Parameters

Verify MOD > Network Settings for valid IP configuration. Ensure no duplicate IP addresses on network and proper subnet mask settings.

Use static IP instead of DHCP for industrial environments to avoid configuration conflicts

Test Network Connectivity

Ping gateway and DNS servers from TNC command prompt to verify network communication before saving configuration.

Reset Network Configuration

Clear network settings in MOD > Network Settings, apply default configuration, then reconfigure with known good settings.

Document current network settings before reset to avoid connectivity loss

Disable Network Services

Temporarily disable DNC, TNCremo, and web server services during configuration write to eliminate conflicts.

Check PLC Status

Access MOD > PLC > Status to verify PLC is running without errors. Look for compilation errors or runtime faults.

Check PLC cycle time - values over 50ms may indicate performance issues affecting file operations

Backup and Restore PLC

Export current PLC program via MOD > PLC > Backup, then restore from known good backup to eliminate corrupted configuration data.

Recompile PLC Program

Force recompilation of PLC code through MOD > PLC > Compile All to regenerate configuration files and clear memory allocation errors.

Ensure machine is in safe state before PLC recompilation as I/O may be temporarily unavailable

Verify PLC Memory Usage

Check PLC memory consumption in diagnostics - high memory usage may prevent configuration writes. Optimize code if necessary.