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FANUC Alarm SVGN-042 — Lack of $SGGUN

FANUC SVGN-042 (“Lack of $SGGUN”): The number of $SGGUN is less than total number of axes in the servo gun group(s). First check: Increase $SGSYSCFG.$M_GUN_NUM to the minimum value required to accommodate all servo gun axes.

Updated 2026-09-17 · LogrobotLM reference

Description

The number of $SGGUN is less than total number of axes in the servo gun group(s).

Remedy

Increase $SGSYSCFG.$M_GUN_NUM to the minimum value required to accommodate all servo gun axes. After changing this sysvar, go to control start, and then perform a Cold start, to make the change effective.

Related codes

SVGN-040Thk:… NOT intol(expect:…).SVGN-041WARN No more available memory(PERM)SVGN-043AutoTuning Started.SVGN-044AutoTune Successfully Complete

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 →