290

Interface Switch Signal (DRC) Switched During Block Execution

Fanuc · Alpha i series AC Servo Motor

What does 290 mean?

The interface switch signal (DRC) was switched while a block was being executed. This unexpected change during an active operation can lead to system instability or incorrect behavior.

Common Causes

  • Interface switch signal (DRC) was toggled during an ongoing block execution.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the interface switch signal (DRC) is switched only after block execution has completely stopped.

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Verified technical data. Last updated: March 2026

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Source: Fanuc Alpha i series AC Servo Motor
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