LogrobotLM

LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free →

FANUC Alarm SEAL-291 — WARN No start sealing input defined

FANUC SEAL-291 (“WARN No start sealing input defined”): The PNS Ack Verified input, which is needed with the current communication configuration, has not been defined. First check: Set up a PNS Ack Verified in the Cell Input I/O menu and restart the robot.

Updated 2026-09-17 · LogrobotLM reference

Description

The PNS Ack Verified input, which is needed with the current communication configuration, has not been defined.

Remedy

Set up a PNS Ack Verified in the Cell Input I/O menu and restart the robot.

Related codes

SEAL-289STOP Macro table already fullSEAL-290STOP Invalid call to SL__INSTSEAL-292STOP Max Error table entry exceededSEAL-293No SLSHELL has been loaded!!!

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 →