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Check Physical Connections

Inspect all RJ45 connections on PROFINET devices and switches. Verify cable integrity using HMI > Diagnostics > Hardware > PROFINET to view port status.

Power down devices before reconnecting cables to prevent damage

Test Cable Continuity

Use cable tester to verify twisted pair integrity on all PROFINET cables. Check for proper Cat5e/Cat6 rating and maximum 100m segment length.

Look for intermittent connection issues by gently flexing cables while monitoring PROFINET diagnostics

Verify Switch Port Status

Check PROFINET switch port LEDs and statistics. Access switch diagnostics via HMI > Commissioning > Hardware > PROFINET > Topology to identify faulty ports.

Check Device Power Status

Verify 24VDC supply voltage at each PROFINET device. Use HMI > Diagnostics > PROFINET > Device Status to identify offline devices.

Measure voltage with proper safety equipment and lockout procedures

Inspect Power Supply Loading

Check power supply current consumption against rated capacity. Verify proper grounding and cable gauge for 24VDC distribution.

Intermittent power issues often show as devices cycling online/offline in PROFINET diagnostics

Test Device Recovery

After restoring power, monitor device startup sequence in HMI > Diagnostics > PROFINET > Topology view. Devices should show green status within 30 seconds.

Compare Configured vs Actual Topology

Access HMI > Commissioning > Hardware > PROFINET > Compare Configuration to identify mismatched device names, IP addresses, or slot assignments.

Use 'Actual Topology' view to see what devices are physically present vs configured

Verify Device Station Names

Check that physical device station names match STEP 7 configuration. Use PRONETA tool to scan network and verify device identification.

Duplicate station names will cause multiple devices to go offline

Update Configuration if Required

If hardware changes were made, update PROFINET configuration in STEP 7 and download to NCU via HMI > Commissioning > Hardware > Download Configuration.

Check Switch Power and Status

Verify PROFINET switch power supply and check port status LEDs. Access switch diagnostics through HMI > Diagnostics > Hardware > PROFINET > Infrastructure.

Do not power cycle switches during active machining operations

Identify Network Loops

Check for accidental network loops that can cause broadcast storms. Verify proper network topology with single path between devices.

Managed switches often have loop detection features - check switch configuration

Test Switch Port Functionality

Move suspected faulty device connections to different switch ports to isolate port-specific failures. Monitor connection status in PROFINET diagnostics.

Check NCU Ethernet Port Status

Verify X130 port LED status on NCU. Access HMI > Diagnostics > Hardware > NCU > Interfaces to check PROFINET controller status.

NCU interface failures typically require module replacement by qualified technician

Test with Known Good Cable

Connect NCU directly to a single PROFINET device with verified good cable to isolate NCU interface from network infrastructure issues.

Review NCU Diagnostics Buffer

Check HMI > Diagnostics > NCU > Alarm Buffer for additional hardware fault alarms that may indicate NCU interface failure.