Measuring systems (G90/G91)

G90                                        Absolute dimension                                              (modal, initial state)

G91                                      Incremental dimension                                                  (modal)

With an absolute dimensional input (G90), all coordinate specifications are based on the coordinate origin, i.e. the coordinates in a motion block specify the target point in the coordinate system.

With incremental programming (G91), the coordinate values are based on the target point of the preceding motion block, i.e. the coordinates in a motion block specify the path to be travelled.