140-0044

Verify PLC Changes

Press MOD key, select PLC Programming, check if recent edits were made. Look for modified timestamp on plc.mkd file in PLC directory.

Always document PLC changes in the comment header section with date and modification description for future troubleshooting.

Save All Active Programs

Before shutdown, ensure all active NC programs are saved. Press PGM MGT key and verify current program status.

Unsaved program changes in the editor will be lost during shutdown.

Perform Controlled Shutdown

From main screen, select Operating Mode key > Control Shutdown. Wait for 'Control can now be switched off' message before cycling power.

Cold Restart Control

Cycle main control power OFF for minimum 10 seconds, then power ON. Monitor boot sequence on screen for any additional errors.

Verify PLC Functionality

After restart, press MOD > PLC Programming > PLC Monitor to verify PLC is running and check M/W markers are functioning correctly.

Use PLC trace function to monitor critical I/O signals immediately after restart to confirm proper initialization.

Identify Changed Parameters

Press MOD key > Machine Parameters. Check recent entries - modified parameters show timestamp. Common triggers: CfgAxisGeo, CfgDriveParam, CfgSerialInterface changes.

Use MOD > System Configuration > Log File to review detailed history of parameter changes with exact timestamps.

Document Current Settings

Before shutdown, backup current machine parameters: MOD > Data Backup/Restore > Backup Machine Parameters to external USB or network location.

Check for Parameter Conflicts

Review changed parameters for logical consistency - verify axis names match kinematic definitions and drive assignments are sequential without gaps.

Execute Controlled Shutdown

Navigate to main menu > Operating Mode > Control Shutdown. Do not use emergency power-off or circuit breaker.

Improper shutdown may corrupt parameter files and require restoration from backup.

Restart and Verify Configuration

After cold restart, press MOD > System Information > Control Version to verify system loaded correctly. Check all axes appear in position display.

Review Network Configuration

Press MOD > System Configuration > CC Configuration. Check if drive addresses, baud rates, or topology settings were modified recently.

Compare current CC configuration against machine documentation to ensure no unintended changes were made.

Check Drive Assignment

Navigate to MOD > Machine Parameters > CfgDriveParam. Verify each axis has correct drive module assignment and communication channel.

Incorrect drive assignments can cause axis runaway or control shutdown after restart.

Perform Safe Shutdown Sequence

Ensure all axes are at rest and spindle is stopped. Select Operating Mode > Control Shutdown from main menu.

Cold Boot and Monitor Drive Detection

Cycle power and watch boot sequence. Control will display 'Initializing drive system' - should complete without timeout errors. Time should be consistent with previous boots.

Boot times significantly longer than normal indicate communication issues with one or more drives on the bus.

Verify Drive Communication

After restart, press MOD > System Diagnostics > Drive Status. Confirm all configured drives show 'Ready' status with green indicators.

Verify Software Changes

Press MOD > System Information > Control Version. Note current software version. Check TNC:\system\install directory for recent update files or log entries.

Review sys.log file in system directory for automatic update installations that may have occurred.