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FANUC Alarm SRVO-240 — SERVO Chain 1 (FENCE) abnormal

FANUC SRVO-240 (“SERVO Chain 1 (FENCE) abnormal”): A single chain 1 (+24V) failure occurred when the FENCE circuit was opened. First check: 1. Repair the circuit of the chain 1 (+24V) on FENCE the hardware.

Updated 2026-09-17 · LogrobotLM reference

Description

A single chain 1 (+24V) failure occurred when the FENCE circuit was opened.

Remedy

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

Related codes

SRVO-238SERVO Chain 1 (SVON) abnormalSRVO-239SERVO Chain 2 (SVON) abnormalSRVO-241SERVO Chain 2 (FENCE) abnormalSRVO-242SERVO Chain 1 (EXEMG) abnormal

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 →