320-003B

Check IOC Project Parameter

Navigate to MOD function → Machine Parameters → CfgPlcPeriphery and verify the iocProject parameter points to the correct file path.

The file path should typically be relative to the TNC:\system\ directory structure.

Verify File Existence

Use the TNC file manager to navigate to the specified IOC project file location and confirm the .ioc file exists.

Do not modify system files without proper backup procedures.

Restore Missing File

If file is missing, restore from backup or contact machine tool builder for the correct IOC configuration file for your specific machine model.

Restart IOC Service

After file restoration, perform a PLC restart via MOD → PLC → Restart to reinitialize the IOC configuration.

Validate IOC File Integrity

Open the IOC project file using TNC file manager and check for obvious corruption signs like truncated content or binary data in text sections.

IOC files should be readable XML-based configuration files.

Compare with Backup

Compare current IOC file with a known good backup from TNC:\backup\ or machine tool builder's reference files.

Always create a backup before modifying any IOC configuration files.

Restore Valid Configuration

Replace corrupted file with validated backup version and ensure file permissions are correctly set for TNC system access.

Perform System Restart

Execute a complete TNC restart to reload the IOC configuration and verify alarm clearance.

Check IOC Hardware Status

Navigate to MOD → Diagnosis → Hardware to view IOC module status and identify any modules showing communication errors.

Look for red status indicators or timeout messages in the hardware diagnostic display.

Verify Bus Connections

Inspect physical connections between TNC control and IOC modules, checking for loose cables or damaged connectors on the IOC bus.

Power down the system before inspecting any hardware connections.

Test IOC Power Supply

Measure voltage levels at IOC modules to ensure proper 24VDC supply and check for voltage drops under load conditions.

Reset IOC Communication

Use MOD → PLC → IOC Reset function to reinitialize communication with IOC hardware modules.

Review CfgPlcPeriphery Parameters

Access MOD → Machine Parameters → CfgPlcPeriphery and document all IOC-related parameter settings including iocProject, iocEnable, and hardware addresses.

Take screenshots of current parameters before making any changes for easy rollback.

Cross-Reference Hardware Documentation

Compare parameter settings with machine tool builder's IOC configuration documentation to identify mismatches.

Incorrect IOC parameters can cause unpredictable machine behavior.

Update Parameter Values

Correct any mismatched parameters using the machine tool builder's specifications and save changes to machine parameter memory.

Validate Configuration

Restart the TNC control and verify that IOC hardware initializes properly without generating alarm 320-003B.