Haas Alarm: 602 (L) NON-MONOTONOUS PQ BLOCKS IN X – The path defined by PQ was not monotonic in the X-axis. A monotonic Path is one that does not change direction starting from the first Motion block. The control is looking for the X-axis to move in a continuous motion from small to big or big to small. You cannot change direction in the X-axis with out defining the tool path as a type II canned cycle. If this is the case you need to add a Z-axis reference on the same line as the first X-axis move after the G71.