FANUC Alarm CPMO-090 — Invalid MainChn ID
Manufacturer wording — Invalid MainChn ID (G: %d^2)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC CPMO-090 (“Invalid MainChn ID”): Internal Error: Main Channel Id is invalid. First check: The system might have been corrupted.
Updated 2026-09-17 · LogrobotLM reference
Description
Internal Error: Main Channel Id is invalid.
Remedy
The system might have been corrupted. This might have been caused by any of a number of reasons including: Incorrect loading and setup loading incompatible options, mixing software version when adding options and other memory corruption problems. The following is a list of possible remedies:
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 →