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FANUC Alarm HOST-111 — WARN Cycle power to use Ethernet

Warning
Hardware
main board and memory
Controllers
R-J3iB / R-30iA
FANUC class
WARN
Hardware family
FANUC teach pendant, main board, CMOS and controller battery alarms

FANUC HOST-111 (“WARN Cycle power to use Ethernet”): ER-1 or ER-2 Ethernet hardware is already running and can not be restarted without cycling First check: Turn off and then turn on the controler.

Updated 2026-10-22 · LogrobotLM reference

Description

ER-1 or ER-2 Ethernet hardware is already running and can not be restarted without cycling

Remedy

Turn off and then turn on the controler.

Field diagnosis

The Ethernet hardware is already in service and cannot be restarted without a power cycle.

What to check

  • Switch the controller off and back on.
  • Note: Appears after a network reconfiguration done while running.

Related codes

HOST-100WARN Communications errorSYST-211Comm processor Time-out errorHOST-109WARN Host name not foundHOST-110WARN Node not foundHOST-112WARN PANIC: …HOST-113PROXY: … bind error

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 →