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FANUC Alarm VISN-120 — WARN Invalid encoder setting

FANUC VISN-120 (“WARN Invalid encoder setting”): The setting data for pulse encoder is invalid, so the system can not read pulse count of encorder. First check: Check the setting data in encorder setting screen and tracking schedule screen.

Updated 2026-09-17 · LogrobotLM reference

Description

The setting data for pulse encoder is invalid, so the system can not read pulse count of encorder.

Remedy

Check the setting data in encorder setting screen and tracking schedule screen.

Related codes

VISN-118WARN Adjusting gains and retryingVISN-119WARN No tracking schedule dataVISN-121WARN Invalid Find Next operationVISN-122WARN Invalid vision tool referenced

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 →