What causes fault code GEN-NET1 (Industrial Network Ring Break)?

Cable disconnected or damaged in the ring. Network switch/device in the ring lost power or faulted. Port failure on one of the ring devices. New device added to ring without proper ring configuration. Cable length exceeded specification — signal degraded

How do I fix fault code GEN-NET1?

Check ring supervisor status — most managed switches report ring status. Walk the ring path — identify which link is broken by checking link LEDs. If device lost power, restore power and verify ring closes. Check cable at identified break point — replace if damaged. Verify all devices in ring are configured for ring protocol (DLR/MRP). After repair, verify ring status returns to Closed/Normal

Industrial Network Ring Break

GEN-NET1

DLR (Device Level Ring) or MRP ring has detected a break. Network is running in line topology with no redundancy.

high general allen-bradley

network dlr ring ethernet redundancy

Probable Causes (ranked)

Cable disconnected or damaged in the ring
Network switch/device in the ring lost power or faulted
Port failure on one of the ring devices
New device added to ring without proper ring configuration
Cable length exceeded specification — signal degraded

Fix Steps

1 Check ring supervisor status — most managed switches report ring status
2 Walk the ring path — identify which link is broken by checking link LEDs
3 If device lost power, restore power and verify ring closes
4 Check cable at identified break point — replace if damaged
5 Verify all devices in ring are configured for ring protocol (DLR/MRP)
6 After repair, verify ring status returns to Closed/Normal

Field Trick

The ring supervisor tells you which port is the active standby (the 'break' in a healthy ring). In a fault, compare which port went active — the break is between the last active device and the next one.

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