LogrobotLM

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FANUC Alarm FILE-051 — WARN NESTED kread issued

FANUC FILE-051 (“WARN NESTED kread issued”): A call to kread was made while a WOULDBLOCK read was pending First check: Do not call kread again until the packet from the previous read has been rcvd

Updated 2026-09-17 · LogrobotLM reference

Description

A call to kread was made while a WOULDBLOCK read was pending

Remedy

Do not call kread again until the packet from the previous read has been rcvd

Related codes

FILE-049WARN File is not standard fileFILE-050WARN PChamp … device NOT ready - device FULLFILE-052WARN Kread re-call with different buf_pFILE-053WARN MC Inserted

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 →