COMMON LED Blink (1:1 High Speed)

Communication Halted by Alarm

Fanuc · R-30iB Mate + Mate Plus Robot

What does COMMON LED Blink (1:1 High Speed) mean?

The Common LED blinks rapidly (0.25s ON / 0.25s OFF), indicating that communication is halted due to an active alarm condition. Further investigation of other alarm indicators is required to pinpoint the specific cause.

Repair Steps

  1. 1

    Identify the cause of the alarm according to the states of the red ALM LED or information displayed on the CNC screen.

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Verified technical data. Last updated: March 2026
Source: Fanuc R-30iB Mate + Mate Plus Robot
Fanuc Error COMMON LED Blink (1:1 High Speed): Communication Halted by Alarm — Troubleshooting Guide | ErrorLib