FANUC Alarm DNET-119 — ERR_STOP_C Dup. MAC Ack Fault
FANUC DNET-119 (“ERR_STOP_C Dup. MAC Ack Fault”): Ack Fault-No acknowledge received during Duplicate MAC ID sequence. First check: Check it the Interface is not the only node on the network.
Updated 2026-09-17 · LogrobotLM reference
Description
Ack Fault-No acknowledge received during Duplicate MAC ID sequence.
Remedy
Check it the Interface is not the only node on the network. Check the baudrate of the interface and make sure it is the network baudrate. Check physical wiring of the network.
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 →