Fanuc Alarm PS997 ILLEGAL COMMAND IN G41.3
Fanuc Alarm Description
(1) A G code other than G00 or G01 in group 01 was specified in the G41.3 mode.
(2) An offset (G code in group 07) was specified in the G41.3 mode.
(3) The block following the block in which G41.3 (startup) was specified did not contain a move command.