Chapter 11 Motion Control Instructions
11-259
11.6.4.2 G91 (Relative Mode)
Function: After G91 is executed, the terminal position of each axis in G code is counted in incremental
method beginning from the current position and G90 can be used to switch into the absolute mode in
the process.
Format: N_G91
Parameter Explanation:
N_: The row number of G code in NC program
Example:
The initial positions of axis X and Y are both 3000 units and the axis parameters are both default
values. The G codes to be executed are as follows:
N0 G91
N1 G0 X6000 Y6000
After G codes are executed, the Y/X curve for the whole movement process is shown below:
X
Position
Y
Position
O
P1
P2
3000 9000
3000
9000