Fanuc · AC Spindle Motor Alpha i-Beta i Series Parameters
A general communication error occurred between the CNC and the serial spindle amplifier for Series 15i. This is a broad indication of communication failure, requiring further investigation into the communication link.
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Confirm the serial port is enabled in the CNC parameters (e.g., P71-01).
Check if the spindle amplifier is powered and its status indicator is normal.
Measure the voltage at the serial communication terminals (e.g., TXD, RXD).
Re-seat the serial cable connector at both the CNC and the spindle amplifier.