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FANUC Alarm IBSS-263 — InterBus has no I/O assignment

FANUC IBSS-263 (“InterBus has no I/O assignment”): InterBus I/O assignment is cleared. First check: Create InterBus I/O assignment if it is supposed to be created manually.

Updated 2026-09-17 · LogrobotLM reference

Description

InterBus I/O assignment is cleared.

Remedy

Create InterBus I/O assignment if it is supposed to be created manually. Cycle power is required to release the alarm.

Related codes

IBSS-224STOP Error in IBS Controller commIBSS-260bit len is set with byte lenIBSS-264Set system pointer failedIBSS-300Bus error

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 →