FANUC Alarm PRIO-100 — STOP Model B comm fault …rack:… slot:…
Error- Hardware
- I/O Link and process I/O
- Controllers
- R-J3iB / R-30iA
- FANUC class
- PAUSE.G
- Hardware family
- FANUC I/O Link, process I/O board, fuse and output alarms
Manufacturer wording — STOP Model B comm fault %srack:%d slot:%d
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC PRIO-100 (“STOP Model B comm fault …rack:… slot:…”): Communication between the Model B interface unit and DI/DO units, or between DI/DO units, is lost. First check: Check the power and cabling from Model B interface unit and DI/DO unit, or between DI/DO units.
Updated 2026-10-22 · LogrobotLM reference
Description
Communication between the Model B interface unit and DI/DO units, or between DI/DO units, is lost.
Remedy
Check the power and cabling from Model B interface unit and DI/DO unit, or between DI/DO units.
Field diagnosis
Communication between the Model B interface unit and its DI/DO units, or between units, is lost.
What to check
- Check the power supply and wiring of the interface unit and of each DI/DO unit, in the order of the chain.
- Note: The rack and slot in the message locate the first silent unit.
Related codes
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 →