FANUC Alarm CPMO-091 — Invalid JBF MainChn ID
Manufacturer wording — Invalid JBF MainChn ID (G: %d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC CPMO-091 (“Invalid JBF MainChn ID”): Internal Error: JBF Main Channel Id is invalid First check: Press RESET.
Updated 2026-09-17 · LogrobotLM reference
Description
Internal Error: JBF Main Channel Id is invalid
Remedy
Press RESET. If the error is not cleared, document the events that led to the error and call your FANUC or FANUC Robotics technical representative.
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 →