LogrobotLM

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FANUC Alarm APSH-048 — WARN PLC comm error - invert check

FANUC APSH-048 (“WARN PLC comm error - invert check”): The backup style group is not the 1's complement (inverse) of the style input group. First check: Verify that the PLC is sending the correct invert style to the correct group.

Updated 2026-09-17 · LogrobotLM reference

Description

The backup style group is not the 1's complement (inverse) of the style input group.

Remedy

Verify that the PLC is sending the correct invert style to the correct group. Disable invert checking in the PNS Cell Setup menu.

Related codes

APSH-046WARN Robot is in Automatic modeAPSH-047WARN Shell will not run without UOPsAPSH-049WARN …APSH-050WARN Cell IO setup is invalid

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 →