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 → · Le diagnostic IA qui lit la sauvegarde de votre robot, sans rien téléverser.

FANUC Alarm SRVO-242 — SERVO Chain 1 (EXEMG) abnormal

FANUC SRVO-242 (“SERVO Chain 1 (EXEMG) abnormal”): A single chain 1 (+24V) failure occurred when External Emergency stop input was asserted. First check: 1. Repair the circuit of the chain 1 (+24V) on the External Emergency stop hardware.

Updated 2026-08-29 · LogrobotLM reference

Description

A single chain 1 (+24V) failure occurred when External Emergency stop input was asserted.

Remedy · Remède

1. Repair the circuit of the chain 1 (+24V) on the External Emergency stop hardware. 2. Set CHAIN FAILURE detection to TRUE on SYSTEM/CONFIG the screen. 3. Press RESET on the teach pendant.

Frequently asked · Questions fréquentes

What does FANUC alarm SRVO-242 mean?
FANUC SRVO-242 (“SERVO Chain 1 (EXEMG) abnormal”): A single chain 1 (+24V) failure occurred when External Emergency stop input was asserted.
How do you troubleshoot FANUC alarm SRVO-242?
1. Repair the circuit of the chain 1 (+24V) on the External Emergency stop hardware. 2. Set CHAIN FAILURE detection to TRUE on SYSTEM/CONFIG the screen. 3. Press RESET on the teach pendant.

Related codes / Codes liés

SRVO-240SERVO Chain 1 (FENCE) abnormalSRVO-241SERVO Chain 2 (FENCE) abnormalSRVO-243SERVO Chain 2 (EXEMG) abnormalSRVO-244SERVO Chain 1 abnormal(Rbt:%d)

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. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →