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FANUC Alarm PAIN-109 — WARN Conveyor direction incorrect

FANUC PAIN-109 (“WARN Conveyor direction incorrect”): For continuous line only. First check: Swap the leads on the encoder repeater board so that the encoder counts positive counts instead of negative

Updated 2026-09-17 · LogrobotLM reference

Description

For continuous line only. The robot has determined the conveyor is running in the wrong direction. Part detects will be ignored by the robot

Remedy

Swap the leads on the encoder repeater board so that the encoder counts positive counts instead of negative

Related codes

PAIN-107WARN Encoder count rolloverPAIN-108WARN Part Detect less than min distPAIN-110WARN … skipped-over max travelPAIN-111WARN Waiting for part in window

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 →