LogrobotLM

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FANUC Alarm MOTN-451 — CS: Internal error No1

FANUC MOTN-451 (“CS: Internal error No1”): An internal error occurred in the Clock Simultaneous function. First check: Write down the steps that led to this error, and contact FANUC or FANUC Robotics for support.

Updated 2026-09-17 · LogrobotLM reference

Description

An internal error occurred in the Clock Simultaneous function.

Remedy

Write down the steps that led to this error, and contact FANUC or FANUC Robotics for support.

Related codes

MOTN-443Zero accel time usedMOTN-444No J2/J3 interactionMOTN-461CS: Both of EXT. & VR. clock validMOTN-462CS: No data signal for EXT.clock

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 →