LogrobotLM

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FANUC Alarm SYST-128 — WARN No interlock output defined

FANUC SYST-128 (“WARN No interlock output defined”): The interlock mode output, which is required with the current program selection options, has not been defined. First check: Set up an interlock mode output in the Cell Output I/O menu and restart the robot.

Updated 2026-09-17 · LogrobotLM reference

Description

The interlock mode output, which is required with the current program selection options, has not been defined.

Remedy

Set up an interlock mode output in the Cell Output I/O menu and restart the robot.

Related codes

SYST-126WARN No task-OK output definedSYST-127WARN No isolate output definedSYST-129WARN No manual style output definedSYST-130WARN Program still running

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 →