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FANUC Alarm INTP-646 — PNSTROBE signal is input

FANUC INTP-646 (“PNSTROBE signal is input”): Because the maintenance DO is OFF, the fast fault recovery sequence cannot be executed. First check: Confirm the setup of fast fault recovery.

Updated 2026-09-17 · LogrobotLM reference

Description

Because the maintenance DO is OFF, the fast fault recovery sequence cannot be executed.

Remedy

Confirm the setup of fast fault recovery.

Related codes

INTP-644RESUME/MAINT cannot be used hereINTP-645Instruction number is wrongINTP-647Maintenance DO is OFFINTP-648Please install J664

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 →