User manual

ADT-HC4500 CNC Flame/Plasma Controller
79
Chapter IV Instruction System
1. Explanation of programming symbol
Every motion of the CNC processing is done following the due process, every processing program is
composed by several instruction segments, each instruction segment is composed by several function words,
and each function word should be started with a letter following by the parameter value.
Definition of function word:
G Preparatory function
M M-function
L Cycle index or delay time
X Coordinate of X axis: It is relative coordinate in G91 (default), and absolute coordinate in G90.
Y Coordinate of Y axis: It is relative coordinate in G91 (default), and absolute coordinate in G90.
I during the circular arc processing, the center coordinate value minus the original value of X axis
J during the circular arc processing, the center coordinate value minus the original value of Y axis
R Specify the radius of circular arc
2. Coordinate explanation
2.1 Relative coordinate
In coordinate system, if the coordinate of current point is calculated from the previous coordinate, it is
called relative coordinate. As the picture shows:
Picture 2.1
B
A
C
D