Fanuc Alarm 354 THE G28 WAS INSTRUCTED IN WITH THE REF POS NOT FIXED IN SYNC MODE (T Series)

Fanuc Alarm 354 THE G28 WAS INSTRUCTED IN WITH THE REF POS NOT FIXED IN SYNC MODE (T Series)
Fanuc Alarm Description
This error occurred when G28 was specified to the master axis being parking during synchronous control , but an axis reference position is not set for the slave axis.