FANUC Alarm PRIO-091 — Op panel comm error …, … (hex)
Error- Hardware
- I/O Link and process I/O
- Controllers
- R-30iA (this generation only)
- FANUC class
- STOP
- Hardware family
- FANUC I/O Link, process I/O board, fuse and output alarms
Manufacturer wording — Op panel comm error(ch:%d) %x, %x (hex)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC PRIO-091 (“Op panel comm error …, … (hex)”): Indicates that an error has been detected in communication between the MAIN PCB and Panel PCB. First check: Check the cabling between the MAIN PCB and Panel PCB.
Updated 2026-10-22 · LogrobotLM reference
Description
Indicates that an error has been detected in communication between the MAIN PCB and Panel PCB.
Remedy
Check the cabling between the MAIN PCB and Panel PCB.
Field diagnosis
Communication error between the main board and the panel board.
What to check
- Check the cable and connectors between the two boards; replace the cable, then the panel board.
- Note: R-30iA code.
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 →