Fanuc · Series 30i/31i/32i-MODEL B Plus
This internal alarm signals a communication data error, primarily caused by noise affecting the data transmission. Unstable position data from the Pulsecoder can lead to incorrect axis control or unexpected machine behavior.
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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.