Fanuc · Series 30i/31i/32i-MODEL B Plus
This external alarm signals a communication data error from the separate detector, primarily caused by noise. Unstable position data from the separate detector can lead to erratic or inaccurate control.
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Check CNC diagnosis information No.356 (Built-in detector) and No.357 (Separate detector) for incremented values, which indicate noise effects. The value is cleared when the CNC unit is powered off.