100935

Verify physical network connection: Check Ethernet cable connection at both NCU and switch/router, ensure link LEDs are active and green.

From HMI, navigate to Commissioning > Network > Configuration and verify the IP address, subnet mask, and gateway settings match your network topology.

Ping the remote PC from the SINUMERIK control using the diagnostics network tools to confirm basic IP connectivity exists.

Check network switch ports and VLAN configuration to ensure the CNC and remote PC are on the same network segment and can communicate.

On the remote PC, verify that the Siemens Remote Service software (e.g., ServiceAgent, TeleService) is running and shows active/ready status.

Check Windows Firewall settings on the remote PC and ensure exceptions exist for the Siemens remote diagnostics application and required ports (TCP 102, 5900, or as configured).

Temporarily disable antivirus and firewall software on the remote PC to test if they are blocking the connection, then re-enable with proper exceptions configured.

Only disable security software temporarily for testing in a controlled environment.

Restart the remote diagnostics service on the PC and retry the connection from the SINUMERIK control.

In the remote diagnostics configuration settings on the HMI, locate the timeout parameter (typically in Service > Remote Diagnostics settings) and increase it from default (usually 10-30 seconds) to 60-90 seconds.

On the remote PC, open Task Manager and check CPU and memory utilization. If above 80%, close unnecessary applications or consider upgrading hardware.

Use network diagnostic tools (ping with timestamps, traceroute) to measure actual round-trip latency between CNC and remote PC. Look for packet loss or latency spikes above 100ms.

Review NCU system logs and remote PC application logs for specific error codes or timeout events that provide additional detail on the failure point.