ABB Error 71421 — IP address already in use on the DeviceNet I/O bus
ErrorABB 71421 (“IP address already in use on the DeviceNet I/O bus”): “IP address already in use on the DeviceNet I/O bus” is an ABB IRC5 event of major severity.
Updated 2026-10-23 · LogrobotLM reference
What it means
“IP address already in use on the DeviceNet I/O bus” is an ABB IRC5 event of major severity.
Related codes
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →