The operator, a veteran named Marcus, stared at the frozen screen. He had just commanded a high-speed spindle run. The machine was designed to switch its internal spindle motor windings to handle the transition from low-speed torque to high-speed power. But something in that lightning-fast handshake had failed. Marcus knew the symptoms of a 7115 fault all too well:
If a machine builder created a custom macro that executes a DPRNT (Print) function or attempts to write to a PLC address that doesn't exist (e.g., W# instruction with an out-of-range byte), the CNC will halt and display 7115 with a sub-code indicating the illegal offset. fanuc 7115 alarm
7115 Alarm Message: OVERSPeed (or related parameter error) Applicable Systems: Fanuc Series 16i/18i/21i, 16/18/21, 0i, and 30i Series controls. The operator, a veteran named Marcus, stared at
