In the world of FANUC diagnostics, Alarm 7115 is notoriously vague. It is the CNC control’s way of saying, "I tried to move the axis, but something physically stopped me, and I don't know exactly what it is."
: Locate the power supply modules in the electrical cabinet (there are often two sitting side-by-side). Use a multimeter to verify they are outputting exactly 24VDC. fanuc 7115 alarm
The FANUC I/O Link is a daisy-chained network connecting the main CNC to remote I/O racks (e.g., I/O Unit A, I/O Unit B, or a handheld pendant). If a terminating resistor is missing, a cable is broken, or a slave unit (I/O module) loses power, the PMC will generate an 7115 alarm because it cannot "see" the expected hardware map. In the world of FANUC diagnostics, Alarm 7115