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FANUC Alarm IBSS-477 — mktsk … failed …

Manufacturer wording — mktsk %d failed %d
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC IBSS-477 (“mktsk … failed …”): System internal error First check: Document the events that led to the error, and call your FANUC or FANUC Robotics technical service representative.

Updated 2026-09-17 · LogrobotLM reference

Description

System internal error

Remedy

Document the events that led to the error, and call your FANUC or FANUC Robotics technical service representative.

Related codes

IBSS-475PCI board not installedIBSS-476newmem … failedIBSS-478Slave Parameterization invalidIBSS-479Firmware Updating Mode

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 →