System information

SECTION FOUR - PREPARATORY FUNCTIONS (G CODES)
Absolute Positioning
G90 X0 Y0 P1
X2 Y2 P3
X1 Y1.5 P2
Incremental mode (modal) (G91)
This function causes the control to go into the incremental mode. In this mode all dimensions are
entered relative to the machine position in the previous block. In the case of MDI, the
dimensions are relative to the current machine position. Dimensions in G91 can be either
positive or negative. Care should be taken when using G91. Whenever activating tool offsets, R-
plane dimensions, or setting floating zeroes via G92, the control should not be in the G91 mode.
XC, YC, ZC (centers), AA (start angle) and AB (end angle) are always an absolute.
G91 cancels G90.
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